Ammonia sensing performance of a platinum nanoparticle-decorated tungsten trioxide gas sensor
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): I-Ping Liu, Ching-Hong Chang, Tzu Chieh Chou, Kun-Wei LinAbstractPlatinum nanoparticles (Pt NPs) are decorated on a sputtered tungsten tri-oxide (WO3) thin film to fabricate a high-performance ammonia gas sensor. These Pt NPs are synthesized by drop coating combined with UV irradiation approaches. Compared to a sensor comprising pristine WO3 thin film, the studied Pt NP/WO3 device shows a significant improvement in ammonia sensing response. The experimental results indicate that a high sensing response of 26.9 is measured under 10...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

Detection of hexanal in humid circumstances using hydrophobic molecularly imprinted polymers composite
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Wei Chen, Zhenhe Wang, Shuang Gu, Jun WangAbstractHexanal is a specific volatile organic compound (VOC) for monitoring the quality of various agricultural products and a biomarker for diagnosing lung cancer of human beings. However there is no existing hexanal gas sensor with high sensitivity and selectivity for hexanal detection in the presence of water vapor. Addressing this challenge, a quartz crystal microbalance (QCM) gas sensor modified with a hydrophobic molecularly imprinted polymers (MIPs) composite for hexanal detection ...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

Chicken immunoglobulin Y based FRET assay for TSST-1 detection and its validation onto clinical isolates
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): J. Achuth, R.M. Renuka, S. Naveen, K. KadirveluAbstractStaphylococcus aureus (S. aureus) is commensal bacteria implicated in various opportunistic infections worldwide. Their numerous virulence factors along with mounting antibiotic resistance is an ominous problem associated with its clinical management. Among the numerous S. aureus virulence factors, toxic shock syndrome toxin 1 (TSST-1) is a superantigen that is pivotal in life-threatening multisystem disorder. The present study reports the development of a fluorescence resonan...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

Electrochemical immunosensors with protease as the signal label for the generation of peptide-Cu(II) complexes as the electrocatalysts toward water oxidation
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Ning Xia, Dehua Deng, Suling Yang, Yuanqiang Hao, Luyan Wang, Yuwei Liu, Cuixia An, Qiuyang Han, Lin LiuAbstractThis work reported that protease can be used as the signal label to amplify the signal of electrochemical immunosensors. Carbon nanotube (CNT) was used as the carrier of recognition antibody and signal label. The nanolabel was captured by sensor electrode via a sandwich-type immunoreaction. Protease on the surface of nanolabel can catalyze the hydrolysis of peptide substrate to liberate an amino terminal Cu(II)- and Ni(I...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

A novel electrochemical sensor for the detection of oxidative stress and cancer biomarker (4-nitroquinoline N-oxide) based on iron nitride nanoparticles with multilayer reduced graphene nanosheets modified electrode
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Umamaheswari Rajaji, Akilarasan Muthumariyappan, Shen-Ming Chen, Tse-Wei Chen, R. Jothi RamalingamAbstractHerein, a novel iron nitride nanoparticles (Fe2N NPs) decorated reduced graphene oxide (rGOS) nanocomposite have been designed through a solvothermal method and followed by a nitridation process. After then, as-synthesized Fe2N NPs@rGOS was characterized by HRTEM, FESEM, XPS, XRD, and EIS. Furthermore, the nanocomposite modified SPCE (screen-printed carbon electrode) shows excellent electrochemical sensing performance towards ...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

Fabrication of Co3O4 nanowires assembled on the surface of hollow carbon spheres for acetone gas sensing
In this study, Co3O4 nanowires assembled on the surface of hollow carbon spheres (Co3O4 NWs-HCSs) is successfully realized. Cobalt carbonate hydroxide nanowires assembled on hollow carbon spheres (CoCH NWs-HCSs) were first synthesized by hydrothermal method and the Co3O4 NWs-HCSs were then obtained through the post-annealing treatment (350 °C). It was found that without annealing treatment, the prepared CoCH NWs-HCSs are unstable for the acetone sensing at low temperature, with the optimum operation temperature of 200 °C and the highest response intensity of 3.71 toward 200 ppm acetone. Differe...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

Fabrication of 1D Zn2SnO4 nanowire and 2D ZnO nanosheet hybrid hierarchical structures for use in triethylamine gas sensors
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Fengjun Liu, Xiaoyan Chen, Xinzhen Wang, Ye Han, Xiaojie Song, Jian Tian, Xuanmeng He, Hongzhi CuiAbstractIn this work, unique Zn2SnO4–ZnO hierarchical structures composed of one-dimensional Zn2SnO4 nanowires and two-dimensional ZnO nanosheets were successfully synthesized via a facile hydrothermal method combined with calcination. The Zn2SnO4 nanowires bridged across the ZnO nanosheets, which played an important role in electron transmission. Compared with pure Zn2SnO4 nanowires and pure ZnO nanosheets, the obtained Zn2SnO4...
Source: Sensors and Actuators B: Chemical - April 19, 2019 Category: Chemistry Source Type: research

A novel fluorescent probe with one-excitation and dual-emission for selective and simultaneous detection of Glutathione and Arginine in NIR and blue regions
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Shuwei Zhang, Dongdong Wu, Xu Jiang, Fei Xie, Xiaodong Jia, Xiaoli Song, Yu YuanAbstractA hydroxyphenylbenzothiazole (HBT)-based fluorescent probe (HBT-Py) was synthesized to selectively and simultaneously detect GSH and Arg in NIR (684 nm) and blue (469 nm) regions excited by 400 nm at the absolutely same measured conditions, respectively. After studied the detected mechanism through TLC, HRMS and optical data, we proposed that the detection for GSH could result from the Michael addition and esterlysis reactio...
Source: Sensors and Actuators B: Chemical - April 17, 2019 Category: Chemistry Source Type: research

Surface plasmons coupled two-dimensional photonic crystal biosensors for Epstein-Barr virus protein detection
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Yung-Tsan Chen, Yu-Yang Liao, Chien-Chun Chen, Hui-Hsin Hsiao, Jian-Jang HuangAbstractThe fundamental detection scheme of typical grating or photonic crystal (PhC) sensors relies on the correlation of the diffraction behaviors with the refractive index of target analyte. For biomaterial detection, a thin gold film is usually deposited on the sensor surface so that cross linkers can be anchored before functionalizing the device. The nanoscale metallic film suggests plasmonic resonances play a critical role in light-matter interacti...
Source: Sensors and Actuators B: Chemical - April 17, 2019 Category: Chemistry Source Type: research

An integrated one-step assay combining thermal lysis and loop-mediated isothermal DNA amplification (LAMP) in 30 min from E. coli and M. smegmatis cells on a paper substrate
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Priyanka Naik, Siddhant Jaitpal, Prasad Shetty, Debjani PaulAbstractDeveloping sensors for food safety, soil analysis, water quality monitoring and healthcare often requires distinguishing between different species of bacteria. The most rapid, sensitive and specific method to identify bacteria is to analyse their DNA sequence, which comprises of disinfection and lysis of bacterial cells, amplification of the isolated DNA and detection of the amplified sequence. Seamless integration of these steps on a paper substrate is a big chal...
Source: Sensors and Actuators B: Chemical - April 17, 2019 Category: Chemistry Source Type: research

A water-soluble and highly specific fluorescent probe with large Stokes shift for imaging basal HOCl in living cells and zebrafish
Publication date: Available online 15 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Caiyun Liu, Pan Jia, Zihan Zhuang, Zuokai Wang, Qingxia Duan, Zilu Li, Hanchuang Zhu, Xue Zhang, Baocun Zhu, Wenlong ShengAbstractHypochlorous acid (HOCl) as a biologically important reactive oxygen species (ROS) plays crucial roles in the physiological and pathological processes. It is thus meaningful to explore an effective method for detecting basal HOCl in living systems. We herein report a large Stokes shift (about 115 nm) fluorescent probe LSS-HA for highly specific and ultrasensitive detection of HOCl with exce...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

A folic acid-sensitive polyfluorene based “turn-off” fluorescence nanoprobe for folate receptor overexpressed cancer cell imaging
Publication date: Available online 15 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Susmita Roy, Anusha Gunukula, Balaram Ghosh, Chanchal ChakrabortyAbstractHerein, we have developed an efficient approach for folate receptor (FR) over expressed cancer cell targeting and imaging through non-covalent conjugation between folic acid (FA) and a polyfluorene based amphiphilic, fluorescent polymer nanoprobes (CPF) by fluorescence “turn off” mechanism. The pH dependent supramolecular complexation/decomplexation tendency of CPF nanoprobes with FA provides the effective reversible fluorescence “turn...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

Light stimulated and regulated gas sensing ability for ammonia using sulfur-hyperdoped silicon
Publication date: Available online 15 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Xiao-Long Liu, Sheng-Xiang Ma, Su-Wan Zhu, Yang Zhao, Xi-Jing Ning, Li Zhao, Jun ZhuangAbstractIn recent years, sulfur-hyperdoped silicon has attracted widespread interests for its physics and applications in the optoelectronic fields. In this article, we first study the sensing ability of the sulfur-hyperdoped silicon for ammonia gas. The sensing properties of the sensor in the dark are investigated but an extremely weak gas response is exhibited by the principle of the conductometric gas sensor. Interestingly, the material...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

A Low Temperature Formaldehyde Gas Sensor Based on Hierarchical SnO/SnO2 Nano-flowers Assembled from Ultrathin Nanosheets: Synthesis, Sensing Performance and Mechanism
Publication date: Available online 15 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Na Li, Yu Fan, Ying Shi, Qun Xiang, Xiaohong Wang, Jiaqiang XuAbstractHere we report a hierarchical flower-like SnO/SnO2 gas sensing material for detecting formaldehyde vapor at a low temperature. It was rationally designed and successfully synthesized via a one-step hydrothermal route. The crystal phase, defects, element composition and morphology of the obtained samples were characterized in detail by XRD, FESEM, TEM, Raman, PL, and XPS. The characterized results reveal that hierarchical SnO/SnO2 nano-flowers are assembled...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

A self-powered microfluidic chip integrated with fluorescent microscopic counting for biomarkers assay
Publication date: Available online 16 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Jian Yang, Xinli Liu, Yongchun Pan, Jingjing Yang, Bangshun He, Yunzhi Fu, Yujun SongAbstractSandwich immunoassay plays a significant role in disease diagnostics and prognosis. However, this technology always requires cumbersome manual washing procedures and well trained operators. To address the issues, we made an effort to develop a self-powered microfluidic chip (SP-Chip) to accomplish multiple washing processes and antigen-antibody binding reaction automatically in one-step sliding manner. This smart microfluidic platfor...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

Direct growth of 3D porous (Ni-Co)3S4 nanosheets arrays on rGO-PEDOT hybrid film for high performance non-enzymatic glucose sensing
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Alan Meng, Xiangcheng Yuan, Zhenjiang Li, Kun Zhao, Liying Sheng, Qingdang LiAbstractA binder-free, rapid and low-cost electrodeposition technology for growing 3D porous (Ni-Co)3S4 nanosheets arrays on glassy carbon electrode (GCE) functionalized by reduced graphene oxide-poly (3,4-ethylenedioxythiophene) (rGO-PEDOT) hybrid film is successfully developed to construct a sensor for non-enzymatic glucose sensing. The main experimental variables affected on the electrochemical performance are optimized. Benefiting from the synergistic...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

Focused surface acoustic waves induced microdroplets generation and its application for microgels
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Shaobo Jin, Xueyong Wei, Zhen Liu, Juan Ren, Zhuangde Jiang, Chris Abell, Ziyi YuAbstractWe demonstrate a novel microdroplets generation method by using focused surface acoustic waves (FSAW). The method differs from previous work in the mechanism and the geometry structure of the chip, which is depend on FSAW rather than flow shearing. The acoustic radiation force arising from FSAW acts on the oil-water interface, breaking up the water into microdroplets whose size can be controlled by tuning the driving voltage and frequency of F...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

Tetraphenylethene decorated hyperbranched poly(amido amine)s as metal/organic-solvent-free turn-on AIE probe for specific pyrophosphate detection
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Cheng Li, Yu Chen, Lijun Yang, Congrou Zhang, Bin Wang, Yong WangAbstract“Turn-on” fluorescent materials in the absence of metal and organic solvent are highly desirable as bioprobes to selectively and sensitively detect pyrophosphate (PPi) anion. In this work, we embedded tetraphenylethene (TPE) inside the relatively rigid hyperbranched poly(amido amine) (HPA) to afford highly water soluble TPE-HPA materials, where the TPE fluorescence was pre-quenched in water by the hyperbranched structure of HPA without participati...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

A non-enzymatic photoelectrochemical glucose sensor based on BiVO4 electrode under visible light
Publication date: 15 July 2019Source: Sensors and Actuators B: Chemical, Volume 291Author(s): Shan Wang, Shaoping Li, Wenwen Wang, Mengting Zhao, Jiaofeng Liu, Haifeng Feng, Yiming Chen, Qi Gu, Yi Du, Weichang HaoAbstractA non-enzymatic photoelectrochemical (PEC) glucose sensor based on nanoporous bismuth vanadate (BiVO4) electrode is fabricated on fluorine doped tin oxide by electrochemical deposition. The photogenerated holes of BiVO4 show a strong oxidizing ability, with adsorption of glucose on the surface of BiVO4, agreeing well with the classical Langmuir adsorption model. Under visible light irradiation, the glucose...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

Polymer-infiltrated SiO2 inverse opal photonic crystals for colorimetrically selective detection of xylene vapors
In this study, we report the development of a polymer infiltrated SiO2 inverse opal photonic crystal (IOPC) for selective detection of xylene vapors. Poly(4-vinylbenzyl chloride-co-methyl methacrylate) (P(VBC-co-MMA)), which shows strong affinity towards xylenes because of their similar solubility parameters, was synthesized and infiltrated into SiO2 IOPC (P(VBC-co-MMA)-SiO2 IOPC). The resulting P(VBC-co-MMA)-SiO2 IOPC sensor shows color change from green to red upon exposure to xylene vapors as the diffusion and adsorption of gaseous xylenes increased the effective refractive index of the IOPC. It shows good sensitivity w...
Source: Sensors and Actuators B: Chemical - April 16, 2019 Category: Chemistry Source Type: research

A novel up-conversion fluorescence resonance energy transfer sensor for the high sensitivity detection of coumarin in cosmetics
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Hao Yang, Xueni Chen, Jiasheng Wu, Rongying Wang, Haipeng YangAbstractCoumarin is widely used as spices in a variety of cosmetics. However, its concentration in cosmetics is strictly limited because it is a kind of suspected carcinogen. It is essential and highly desired to develop fast and convenient detection methods to detect trace amount of coumarin. This work presents a novel and simplified fluorescent sensor for the determination of coumarin based on the phenomenon of fluorescence resonance energy transfer (FRET). In this sys...
Source: Sensors and Actuators B: Chemical - April 14, 2019 Category: Chemistry Source Type: research

Hollow carbon sphere supported Ag nanoparticles for promoting electrocatalytic performance of dopamine sensing
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Xinjin Zhang, Jianbin ZhengAbstractNonenzyme electrochemical sensor of dopamine based on various highly active nanomaterials has attracted enormous attention. In this paper, hollow carbon spheres (HCSs) were chosen as the catalyst supports due to its abundant mass transport channels, large specific surface area and electronic properties. Ag nanoparticles decorated mesoporous HCSs were synthesised by employing sodium borohydride as reductant. The Ag nanoparticles attached HCSs with an average diameter of ˜ 6 nm. The BET...
Source: Sensors and Actuators B: Chemical - April 14, 2019 Category: Chemistry Source Type: research

Fluorometric and colorimetric analysis of carbamate pesticide via enzyme-triggered decomposition of Gold nanoclusters-anchored MnO2 nanocomposite
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Xu Yan, Deshuai Kong, Rui Jin, Xu Zhao, Hongxia Li, Fangmeng Liu, Yuehe Lin, Geyu LuAbstractIn this work, we designed a multi-signal readout platform for sensitive monitoring carbamate pesticide based on gold nanoclusters-anchored MnO2 (AuNCs-MnO2) nanocomposite. The fluorescence of AuNCs was quenched by MnO2 via Förster resonance energy transfer effect. In the presence of acetylcholinesterase and choline oxidase, the substrate acetylcholine (ACh) is catalyzed to generate H2O2 that can specially induce the decomposition of MnO...
Source: Sensors and Actuators B: Chemical - April 14, 2019 Category: Chemistry Source Type: research

Sonochemical nanostructure of Mn(II) supramolecular complex: X-ray structure, sensing and photocatalytic properties
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Safaa El-din H. Etaiw, Hassan MarieAbstractNew supramolecular complex [Mn(EIN)4(NCS)2], SC1 (EIN = ethyl isonicotinate) has been prepared and fully characterized by single crystal X-ray diffraction, FT-IR, powder X-ray diffraction, UV–vis spectra and elemental analyses. The results showed that SC1 consists of discrete units which are connected to each other by intermolecular H-bonds. Also, the nanosized particles of SC1 were prepared under ultrasonic irradiation and their morphological feature was examined by tr...
Source: Sensors and Actuators B: Chemical - April 13, 2019 Category: Chemistry Source Type: research

pH responsive amperometric immunoassay for carcinoma antigen 125 based on hollow polydopamine encapsulating methylene blue
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Xiaoyu Liang, Hongliang Han, Zhanfang MaAbstractA sandwich-type amperometric immunosensor based on pH responsive sensitivity amplifiable route was elaborately designed for determination of carcinoma antigen 125 (CA 125). The sensitivity of amperometric immunosensor depends on a change of current response (ΔI) attributed to antigen to be tested per unit concentration. Employing zeolitic imidazolate framework (ZIF-8) as the template, the hollow-structured polydopamine framework with high specific surface area can be fabricated ...
Source: Sensors and Actuators B: Chemical - April 13, 2019 Category: Chemistry Source Type: research

Hydrodynamic evaluation of gas testing chamber: Simulation, experiment
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Fatima-Ezahra Annanouch, Gilles Bouchet, Pierre Perrier, Nicolas Morati, Christelle Reynard-Carette, Khalifa Aguir, Virginie Martini-Laithier, Marc BendahanAbstractGas concentration measurements by means of metal oxide microsensors represent a promising issue due to several advantages (size, low cost, power consumption, reliability…). However, improvements are required to increase performances of complete experimental systems including microsensor and testing chamber at least. This paper deals with the study of different siz...
Source: Sensors and Actuators B: Chemical - April 13, 2019 Category: Chemistry Source Type: research

A FRET biosensor based on MnO2 nanosphere/copper nanocluster complex: From photoluminescence quenching to recovery and magnification
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Tianzi Li, Zhenguang Wang, Dafeng Jiang, Henggang Wang, Wing-Fu Lai, Yunkai Lv, Yongqing ZhaiAbstractA Förster resonance energy transfer (FRET)-based biosensor using Cu nanoclusters (NCs) as energy donors and signal magnifiers and MnO2 nanospheres as both energy acceptors and target recognizers for selective detection of glutathione (GSH) was developed. MnO2 nanospheres, synthesized through an ultrasonication assisted top down method, can quench the photoluminescence (PL) of Cu NCs through FRET, after forming complex through e...
Source: Sensors and Actuators B: Chemical - April 11, 2019 Category: Chemistry Source Type: research

Fluorometric dual sensing of Hg2+ and Al3+ by novel triphenylamine appended rhodamine derivative in aqueous media
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Serkan ErdemirAbstractTriphenylamine appended rhodamine (named probe TR) was built as a selective fluorescent probe for Al3+ and Hg2+ ions through different sensing mechanisms. TR demonstrated a distinct fluorescence enhancing at 501 and 580 nm towards Al3+ and Hg2+ ions due to the “PET-off” (Photoinduced electron transfer-off) and “FRET-on” (Fluorescence resonance energy transfer-on) processes, respectively. The binding modes between TR with Al3+ and Hg2+ were found to be 1:1 by job plot analysis. Th...
Source: Sensors and Actuators B: Chemical - April 11, 2019 Category: Chemistry Source Type: research

Rapid isolation of Escherichia coli from water samples using magnetic microdiscs
Publication date: Available online 10 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Keisha Y. Castillo-Torres, David P. Arnold, Eric S. McLamoreAbstractThis work introduces a method for rapid isolation of target bacterial cells using “bacteria-sized,” gold-coated magnetic microdiscs (1.5 µm in diameter, 80 nm in thickness). These microdiscs are functionalized with DNA aptamers for selectively isolating Escherichia coli cells from lab-prepared and environmental water samples at concentrations as low as 102 CFU/100 mL with no enrichment. This microdisc platform enables v...
Source: Sensors and Actuators B: Chemical - April 10, 2019 Category: Chemistry Source Type: research

High resolution potassium sensing with large-area graphene field-effect transistors
Publication date: Available online 10 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Ibrahim Fakih, Alba Centeno, Amaia Zurutuza, Boutheina Ghaddab, Mohamed Siaj, Thomas SzkopekAbstractWe demonstrate large-area graphene based ion sensitive field effect transistors (ISFETs) with potassium ionophore sensing layers. Graphene ISFETs encapsulated with an ultra-thin hydrophobic layer, parylene C, and active areas ∼0.4 cm2 are characterized by an rms current noise as low as 5 nA in a 60 Hz electrical bandwidth, field effect mobilities up to 5000 cm2V−1s−1 and quantum capacitance limited co...
Source: Sensors and Actuators B: Chemical - April 10, 2019 Category: Chemistry Source Type: research

Building of a flexible microfluidic plasmo-nanomechanical biosensor for live cell analysis
Publication date: Available online 10 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): V. Solis-Tinoco, S. Marquez, T. Quesada-Lopez, F. Villarroya, A. Homs-Corbera, L.M. LechugaAbstractBiosensor devices can constitute an advanced tool for monitoring and study complex dynamic biological processes, as for example cellular adhesion. Cellular adhesion is a multipart process with crucial implications in physiology (i.e. immune response, tissue nature, architecture maintenance, or behaviour and expansion of tumor cells). This work focuses on offering a controlled methodology in order to fabricate a flexible plasmo-...
Source: Sensors and Actuators B: Chemical - April 10, 2019 Category: Chemistry Source Type: research

Highly selective and sensitive CH4 gas sensors based on flame-spray-made Cr-doped SnO2 particulate films
Publication date: Available online 10 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): K. Bunpang, A. Wisitsoraat, A. Tuantranont, S. Singkammo, S. Phanichphant, C. LiewhiranAbstractIn this research, flame-spray-made 0–2 wt% Cr-doped SnO2 nanoparticles were synthesized and methodically studied for specific detection of methane (CH4) for the first time. From characterizations using X-ray diffraction, X-ray photoelectron spectroscopy, scanning/transmission electron microscopy and nitrogen adsorption, Cr was found to form substitutional solid solution in 5–20 nm nanoparticles with tetrag...
Source: Sensors and Actuators B: Chemical - April 10, 2019 Category: Chemistry Source Type: research

A “signal-on” voltammetric aptasensor fabricated by hcPt@AuNFs/PEI-rGO and Fe3O4NRs/rGO for the detection of zearalenone
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): Baoshan He, Xiaohai YanAbstractA “signal-on” electrochemical aptasensor was proposed by employing hollow cubic platinum@gold nanoframes functionalized polyethyleneimine-reduced graphene oxide (hcPt@AuNFs/PEI-rGO) as the label material and Fe3O4 nanorods/reduced graphene oxide (Fe3O4NRs/rGO) for quantitative detection of zearalenone (ZEN). In this work, the hcPt@AuNFs/PEI-rGO with excellent conductivity and large surface area was synthesized as the label material, which can increase the loading of Thi and DNA S1. The Fe3...
Source: Sensors and Actuators B: Chemical - April 10, 2019 Category: Chemistry Source Type: research

Understanding on the ethanol sensing mechanism of atmospheric plasma sprayed 25 wt. % WO3-75 wt. % SnO2 coating
Publication date: 1 July 2019Source: Sensors and Actuators B: Chemical, Volume 290Author(s): V. Ambardekar, P.P. Bandyopadhyay, S.B. MajumderAbstractAtmospheric plasma spray was utilized to fabricate 25 wt. % WO3-75 wt. % SnO2 composite coating on alumina substrate for ethanol sensing. Analyzing the conductance transients we have demonstrated that the response transients follow Freundlich adsorption isotherm. From isotherm analyses we have estimated the activation energy of the adsorption of test vapors (Ea) and heat of adsorption (Q) as a function of concentration and reported that maximum response % of ethanol among ...
Source: Sensors and Actuators B: Chemical - April 10, 2019 Category: Chemistry Source Type: research

Temperature dependent response/recovery characteristics of Pd/Ni thin film based hydrogen sensor
Publication date: Available online 7 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Qi Liua, Jinyuan Yaoa, Yipin Wanga, Yunna Suna, Guifu DingaAbstractThis paper demonstrates a new phenomenon that the response performance of Pd/Ni film in the heating mode improves a lot compared with room temperature. Based on the phenomenon, Pd/Ni thin film resistive hydrogen sensor integrated with heating resistance wire is fabricated to operate in the heating mode. Through the tests at different operating temperatures, we find that there exists an optimum temperature of 75 °C, when the operating temperature exc...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

Hydrodynamic evaluation of gas testing chamber : Simulation, Experiment
Publication date: Available online 7 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Fatima-Ezahra Annanouch, Gilles Bouchet, Pierre Perrier, Nicolas Morati, Christelle Reynard-Carette, Khalifa Aguir, Virginie Martini-Laithier, Marc BendahanAbstractGas concentration measurements by means of metal oxide microsensors represent a promising issue due to several advantages (size, low cost, power consumption, reliability…). However, improvements are required to increase performances of complete experimental systems including microsensor and testing chamber at least. This paper deals with the study of differe...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

Single-crystalline porous nanoplates-assembled ZnO hierarchical microstructure with superior TEA sensing properties
Publication date: Available online 7 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Yanwei Li, Zhenhua Tao, Na Luo, Guang Sun, Bo Zhang, Honghong Jin, Hari Bala, Jianliang Cao, Zhanying Zhang, Yan WangAbstractFabricating hierarchical structures has emerged as a powerful strategy to improve the gas-sensing performance of metal oxide semiconductor (MOS). In this work, we reported the synthesis of a hierarchical microstructure (HMS) of ZnO via a reliable sacrificial template method and its superior sensing performance to triethylamine (TEA). The synthesized ZnO HMS features an orderly assembly of single-crystal...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

A recyclable CNC-milled microfluidic platform for colorimetric assays and label-free aged-related macular degeneration detection
We report the development of a simple, low-cost, and eco-friendly stand-alone 3D microfluidic chemical sensing platform capable of colorimetric and biochemical analyses at the same time. The microfluidic cellulose microfiber (μCM) chip was prototyped by injecting 10% CM mixtures on computer numeric control (CNC)-milled substrates. We show that the μCM chip has a 3-fold faster flow rate than conventional microfluidic paper-based analytical devices and is a recyclable platform that could perform basic microfluidic experiments. The colorimetric assays of the μCM chip can successfully detect clinically relevant concen...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

A Colorimetric Paper Sensor Based on the Domino Reaction of Acetylcholinesterase and Degradable γ-MnOOH Nanozyme for Sensitive Detection of Organophosphorus Pesticides
Publication date: Available online 6 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Lunjie Huang, Da-Wen Sun, Hongbin Pu, Qingyi Wei, Linpin Luo, Jianlong WangAbstractDespite the tremendous achievements of existing sensing techniques, sensitive and portable sensing of organophosphorus pesticides (OPs) in a non-polluting manner remains a challenging issue. This work proposed a facile colorimetric paper sensor using γ-MnOOH nanowires (NWs) as a degradable nanozyme and 3,3',5,5'-tetramethylbenzidine (TMB) as a chromogenic indicator for rapid and sensitive screening of OPs and acetylcholinesterase (AChE) a...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

Cold Vapor Integrated Quartz Crystal Microbalance (CV-QCM) based Detection of Mercury Ions with Gold Nanostructures
In this study, we developed a novel method of integrating the well-accepted cold vapor technique with gold nanostructured based quartz crystal microbalance (QCM) devices to selectively detect mercury ions (Hg2+). This method allows for the conversion of aqueous mercury ions into elemental mercury (Hg°) vapor form and thereon use the highly sensitive QCM based mercury vapor sensors to detect the evolved mercury. The method involves reducing mercury chloride (HgCl2) in contaminated water by mixing it with a 2% tin chloride (SnCl2) solution in order to evolve Hg° vapor from the liquid mixture. The selectivity and sens...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

Facile Construction of Imidazole Functionalized Polysiloxanes by Thiol-ene “Click” Reaction for The Consecutive Detection of Fe3+ and Amino Acids
Publication date: Available online 6 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Yujing Zuo, Yu Zhang, Zhiming Gou, Weiying LinAbstractNovel imidazole-functionalized polysiloxane (PMMS-IM) was synthesized by facile thiol-ene “click” chemistry. PMMS-IM exhibited strong photoluminescence excited by a wavelength of 365 nm. In addition, the consecutive response to Fe3+ and amino acids by fluorescence quenching and lighting has been investigated. The sequence response of PMMS-IM towards Fe3+ and amino acids exhibit fine selectivity. Moreover, PMMS-IM represented a useful tool for monitoring ...
Source: Sensors and Actuators B: Chemical - April 8, 2019 Category: Chemistry Source Type: research

Humidity Sensor Based on Unsymmetrical U-shaped Twisted Microfiber Coupler with Wide Detection Range
Publication date: Available online 5 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Yun Peng, Yong Zhao, Xu-guang Hu, Mao-qing ChenAbstractOwing to the integration of microfiber couplers (MFCs), polyvinyl alcohol overlay (PVA) material and U-shaped structure, a novel humidometer depended on unsymmetrical U-shaped twisted MFC is reported in this work. The special MFC sensing structure is formed by two microfiber tapers, which attach together under the action of van der Waals force and electrostatic attractive force, therefore it is convenient to adjust the coupling length according to the design requirements....
Source: Sensors and Actuators B: Chemical - April 6, 2019 Category: Chemistry Source Type: research

Ultrafast Deep-red emission fluorescent probe for highly selective imaging of endogenous cysteine in living cells and mice
Publication date: Available online 6 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Zhengliang Lu, Yanan Lu, Chunhua Fan, Xin Sun, Wenqiang Shao, Na Jiang, Xianyi Gong, Yizhong Lu, Guoxin Sun, Xuchuan JiangAbstractIt is still challenging how to selectively and sensitively detect cysteine in living systems which plays crucial roles in many physiological and biological processes. Here, we developed a deep-red emission fluorescent probe (DRP-Cys) for Cys based on a hemicyanine scaffold. A tailed malononitrile group could chromatically shift excitation/emission wavelengths to avoid the limitations such as photo-...
Source: Sensors and Actuators B: Chemical - April 6, 2019 Category: Chemistry Source Type: research

Cutting Edge Microfluidics: Xurography and a Microwave
Publication date: Available online 6 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Nicholas C. Speller, Giorgio G. Morbioli, Michael E. Cato, Thomas P. Cantrell, Erin M. Leydon, Britney E. Schmidt, Amanda M. StocktonAbstractMicrofluidic technologies enable precise fluidic manipulation at the microscale, with applications ranging from inexpensive medical diagnostics to automaton devices for extraterrestrial in situ analysis. However, development of microfluidic tools typically requires high-maintenance infrastructure and resource-intensive development processes, limiting their broad adoption. Furthermore, th...
Source: Sensors and Actuators B: Chemical - April 6, 2019 Category: Chemistry Source Type: research

Ultrathin Transition-Metal Dichalcogenide Nanosheet-based Colorimetric Sensor for Sensitive and Label-free Detection of DNA
Publication date: Available online 4 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Lingyi Lan, Yao Yao, Jianfeng Ping, Yibin YingAbstractTwo − dimensional transition − metal dichalcogenide (TMD) nanosheets have been regarded as a class of promising nanomaterials in various applications due to their outstanding optical, electronic, and catalytic properties. Here, we explored the metal ion-induced optical behavior of four typical TMD nanosheets (WS2, MoS2, WSe2, and MoSe2) prepared via a kitchen blender-assisted shear exfoliation method. Results show that upon the addit...
Source: Sensors and Actuators B: Chemical - April 5, 2019 Category: Chemistry Source Type: research

Template-free Synthesis of Cubic-rhombohedral-In2O3 Flower for ppb Level Acetone Detection
Publication date: Available online 4 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Fang Chen, Man Yang, Xi Wang, Yang Song, Lanlan Guo, Ning Xie, Xueying Kou, Xiumei Xu, Yanfeng Sun, Geyu LuAbstractAnalyzing volatile organic compounds in exhaled breath is a noninvasive method that has potential for disease assessment. Herein, acetone sensors based on porous In2O3 flowers are synthesized through a facile solvothermal method. Structural characterizations demonstrate that the three-dimensional In2O3 flower-like structure comprises porous ultrathin two-dimensional nanosheets. The structural porosity results in ...
Source: Sensors and Actuators B: Chemical - April 5, 2019 Category: Chemistry Source Type: research

Ultrasensitive graphene quantum dots-based catalytic hairpin assembly amplification resonance light scattering assay for p53 mutant DNA detection
Publication date: Available online 4 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Shuang Wang, Feng Zhang, Chunyan Chen, Changqun CaiABSTRACTIn this work, a simple, enzyme-free and ultrasensitive resonance light scattering (RLS) method was developed based on graphene quantum dots (GQDs) with a catalytic hairpin assembly amplification strategy for selective detection of mutant DNA. This method contains two probes, GQDs-H1 and GQDs-H2. Two partially complementary hairpins (H1 and H2) are ingeniously and rationally designed, and they can't spontaneously hybridize with each other in the absence of target. When...
Source: Sensors and Actuators B: Chemical - April 5, 2019 Category: Chemistry Source Type: research

Bifunctional colorimetric biosensors via regulation of the dual nanoenzyme activity of carbonized FeCo-ZIF
Publication date: Available online 4 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Tengteng Wu, Zhangyan Ma, Peipei Li, Qiujun Lu, Meiling Liu, Haitao Li, Youyu Zhang, Shouzhuo YaoAbstractExtensive attention has been paid to rationally control the artificial nanoenzyme activities via suitable strategies to prepare various nanoscale functional materials. Herein, FeCo co-doped carbon sphere (FeCo@C) with intrinsic oxidase-like and peroxidase-like activity has been obtained from the carbonization of FeCo-ZIF. The unique dual-enzyme catalytic property of FeCo@C can be simply regulated and utilized for bifunctio...
Source: Sensors and Actuators B: Chemical - April 5, 2019 Category: Chemistry Source Type: research

AuNPs-DNAzyme molecular motor biosensor mediated by neighborhood click chemistry reactions for the ultrasensitive detection of microRNA-155
Publication date: Available online 4 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Wanchong He, Shuting Li, Lianzhen Wang, Longjiao Zhu, Yangzi Zhang, Yunbo Luo, Kunlun Huang, Wentao XuAbstractAs an important biomarker of cancers and some ischemic diseases, the rapid and ultrasensitive detection of microRNAs (miRNAs) holds great promise for the early diagnosis and treatment of high rates of morbidity and mortal diseases. We prepared optimum gold nanoparticles (AuNPs) as the ideal miRNA detection platform. Utilizing these, an AuNPs-DNAzyme molecular motor biosensor was developed for the detection of miRNA-15...
Source: Sensors and Actuators B: Chemical - April 5, 2019 Category: Chemistry Source Type: research

UV light irradiation enhanced gas sensor selectivity of NO2 and SO2 using rGO functionalized with hollow SnO2 nanofibers
Publication date: Available online 4 April 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Weiwei Li, Jiahui Guo, Li Cai, Wenzhi Qi, Yilin Sun, Jian-Long Xu, Mengxing Sun, Hongwei Zhu, Lan Xiang, Dan Xie, Tianling RenAbstractHerein, to enhance selective detection of NO2 and SO2 using a single device, an ultraviolet (UV) light activated gas sensor has been reported based on reduced graphene oxide (rGO) functionalized with hollow SnO2 nanofibers (NFs) at room temperature. The porous hollow SnO2 NFs are synthesized using electrospinning and calcination treatment, then different contents of SnO2 are introduced to rGO f...
Source: Sensors and Actuators B: Chemical - April 5, 2019 Category: Chemistry Source Type: research