Effect of the Photoexcitation Wavelength and Polarization on the Generated Heat by a Nd ‐Doped Microspinner at the Microscale
This work explores the influence of rotation of a heating microparticle ( β-NaLuF4:Nd3+) onits surrounding fluid's thermal distribution. When optically trapped, rotated, and excited using a circularly polarized laser beam, heating is induced via non-radiative relaxations of Nd3+ ions and recorded by luminescent nanothermometers. Surprisingly, rotation results on reduced heat. Here proposed as a result of anisotropic absorption and temporal lag with laser polarization. AbstractThermal control at small scales is critical for studying temperature-dependent biological systems and microfluidic processes. Concerning this, optic...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Elisa Ortiz ‐Rivero,
Carlos D. González‐Gómez,
Raúl A. Rica,
Patricia Haro‐González Tags: Research Article Source Type: research
Engineering Material Properties of Transcription Factor Condensates to Control Gene Expression in Mammalian Cells and Mice
The material properties of biomolecular condensates have a substantial impact on their function. Using optogenetics, the material properties of transcription factor condensates are systematically modulated from liquid-like toward solid-like. Liquid transcription factor condensates correlated with increased gene expression levels whereas solid-like condensates resulted in reduced gene expression levels. AbstractPhase separation of biomolecules into condensates is a key mechanism in the spatiotemporal organization of biochemical processes in cells. However, the impact of the material properties of biomolecular condensates on...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Alexandra A.M. Fischer,
Hanah B. Robertson,
Deqiang Kong,
Merlin M. Grimm,
Jakob Grether,
Johanna Groth,
Carsten Baltes,
Manfred Fliegauf,
Franziska Lautenschl äger,
Bodo Grimbacher,
Haifeng Ye,
Volkhard Helms,
Wilfried Weber Tags: Research Article Source Type: research
2D Memory Selectors with Giant Nonlinearity Enabled by Van der Waals Heterostructures
A 2D selector based on Gr/hBN/WSe2 heterostructure exhibits high bipolar nonlinearity at room temperature. Profit for well-designed band alignment and proper tunneling barrier, the selector undergoes direct tunneling at low bias while Fowler –Nordheim tunneling at high bias. This proof-of-concept demonstration opens up a new paradigm for promoting 2D 1S1R arrays for memory applications. AbstractThe integration of one-selector-one-resistor crossbar arrays requires the selectors featured with high nonlinearity and bipolarity to prevent leakage currents and any crosstalk among distinct cells. However, a selector with suffic...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Xiaofan Wang,
Ruixi Qiao,
Huan Lu,
Weiwei He,
Ying Liu,
Tao Zhou,
Dongyang Wan,
Qin Wang,
Yanpeng Liu,
Wanlin Guo Tags: Research Article Source Type: research
Designing Urchin ‐Like S@SiO2 with Regulated Pores Toward Ultra‐Fast Room Temperature Sodium–Sulfur Battery
Through the effective regulation of pore sizes, a series of S@SiO2 cathode materials are obtained. Benefitting from the abundant pore channels of SiO2 particles, the sulfur loading is as high as 76.3%. Importantly, a suitable pore size can lead to adequate reaction and rapid diffusion behaviors, resulting in excellent electrochemical performances. AbstractCaptured by high theoretical capacity and low-cost, Sodium –Sulfur (Na-S) batteries have been deemed as promising energy-storage systems. However, their electrochemical properties, containing both cycling and rate properties, still suffer from the notorious “shuttle e...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Xi Wang,
Zihao Zeng,
Zeyu Dong,
Peng Ge,
Yue Yang Tags: Research Article Source Type: research
Emerging Trends in Electron Transport Layer Development for Stable and Efficient Perovskite Solar Cells
This study provides guidelines for the use of efficient ETMs in PSCs, describes the remarkable progress of ETMs in various perovskite systems, and focuses on the key ETL challenges: regulating grain structure, defect passivation techniques, energy level alignment, and interface engineering. It finishes with a detailed assessment of the most advanced ETMs, focusing on their strategic importance and future challenges. AbstractPerovskite solar cells (PSCs) stand at the forefront of photovoltaic research, with current efficiencies surpassing 26.1%. This review critically examines the role of electron transport materials (ETMs)...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Lele Zang,
Chunhu Zhao,
Xiaobo Hu,
Jiahua Tao,
Shaoqiang Chen,
Junhao Chu Tags: Review Source Type: research
A Highly Robust and Conducting Ultramicroporous 3D Fe(II) ‐Based Metal–Organic Framework for Efficient Energy Storage
A 3D redox-active, robust, electrically conductive, ultramicroporous triazolate Fe-MOF is employed as the exclusive electrode material for excellent gravimetric (304 F g−1) and areal (181 mF cm−2) capacitance coupled with high power and energy density even in durable solid-state asymmetric supercapacitor (ASC) devices with remarkable cycling stability, suppressing most of the reported MOF-based electrochemical capacitors, representing encouraging energy storage materials. AbstractExploitation of metal –organic framework (MOF) materials as active electrodes for energy storage or conversion is reasonably challeng...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Soumen Khan,
Santanu Chand,
Pandiyan Sivasakthi,
Pralok K. Samanta,
Chanchal Chakraborty Tags: Research Article Source Type: research
Anti ‐Solvent‐Free Fabrication of Stable FA0.9Cs0.1PbI3 Perovskite Solar Cells with Efficiency Exceeding 24.0% through a Naphthalene‐Based Passivator
In this study, 2-(naphthalen-2-yl)ethylamine hydriodide (NEAI) is employed as the surface passivator for perovskite films without using any anti-solvent. Naphthalene demonstrates strong π-π conjugation, which aids in the efficient extraction of charge carriers. Additionally, the naphthalene-ring moieties form a tight attachment to the perovskite surface. After NEAI treatment, FA and I vacancies are selectively occupied by NEA+ and I− in NEAI respectively, thus effectively passivating the surface defects and isolating the surface from moisture. Ultimately, the optimized NEAI-treated device achieves a promising power con...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Hao Kong,
Chenxu Zhao,
Huifang Han,
Huijing Liu,
Pengchen Zou,
Yao Fu,
Kun Lang,
Fan Shen,
Xuewei Liu,
Jia Xu,
Jianxi Yao Tags: Research Article Source Type: research
Activating TiO2 through the Phase Transition ‐Mediated Hydrogen Spillover to Outperform Pt for Electrocatalytic pH‐Universal Hydrogen Evolution
Inert TiO2 for electrocatalytic HER can be activated by synergistically modulating d-band center and triggering hydrogen spillover through the dual doping-induced partial phase transition, exhibiting a superior performance compared to state-of-the-art Pt/C. AbstractEndowing conventional materials with specific functions that are hardly available is invariably of significant importance but greatly challenging. TiO2 is proven to be highly active for the photocatalytic hydrogen evolution while intrinsically inert for electrocatalytic hydrogen evolution reaction (HER) due to its poor electrical conductivity and unfavorable hyd...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Jiexian Liu,
Peifang Guo,
Da Liu,
Xiaoxiao Yan,
Xin Tu,
Hongge Pan,
Renbing Wu Tags: Research Article Source Type: research
Facile Magnetite Coating for Stable High ‐Voltage Cycling of Nickel‐Rich Cathodes in Conventional Liquid and All‐Solid‐State Lithium‐Ion Batteries
In this study, a protective coating using dispersed “magnetite (FeO.Fe2O3) ” nanoparticles is used to uniformly decorate the surface of LiNi0.8Co0.1Mn0.1O2 (NMC 811) microparticles. The modified cathode delivers significant improvement in electrochemical performance at high voltage ( ≈4.6 V) by suppressing deleterious electrode–electrolyte interactions. A notably higher cycle stability, rate performance, and overall energy density is realized for the coated cathode in a conventional liquid electrolyte battery. When deployed in pellet-stacked solid-state cells with Li6PS5Cl as the electrolyte, the magnetite-coated ...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Varad Mahajani,
Kevin Bhimani,
Aniruddha Singh Lakhnot,
Reena Panchal,
Apurva Anjan,
Rohit M. Manoj,
Nikhil Koratkar Tags: Research Article Source Type: research
Robust, Self ‐Healing, and Multi‐Use Poly(Urethane‐Urea‐Imide) Elastomer as a Durable Adhesive for Thermal Interface Materials
This study is expected to break the current research paradigm of TIMs and offers new insights for the development of advanced, reliable, and sustainable TIMs. (Source: Small)
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Zhiqiang Wu,
Jie Dong,
Han Guo,
Rui Shang,
Xiuzhi Qin,
Yanfei Xia,
Xiuting Li,
Xin Zhao,
Chengchang Ji,
Qinghua Zhang Tags: Research Article Source Type: research
Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials
Addressing the intricate challenge of charge balancing in hybrid and asymmetric supercapacitors, this work proposes a robust methodology. By outlining specific conditions dependent on loaded mass and charge –discharge current or sweep rate, it offers comprehensive insights. Explore these strategies in detail within the extensive table of contents, providing a nuanced understanding of effective charge balancing across positive and negative electrodes. AbstractAn electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative elec...
Source: Small - April 4, 2024 Category: Nanotechnology Authors: Mohammad Qorbani,
Kuei ‐Hsien Chen,
Li‐Chyong Chen Tags: Review Source Type: research
Enabling High Reversibility of Zn anode via Interfacial Engineering Induced by Amino acid Electrolyte Additive
This study advances interfacial engineering through versatile electrolyte additive(s) toward development of stable Zn anode, which may lead to its practical implementation in aqueous rechargeable zinc batteries. (Source: Small)
Source: Small - April 3, 2024 Category: Nanotechnology Authors: Ahmad Naveed,
Teng Li,
Amjad Ali,
Farooq Ahmad,
Waqar Ahmad Qureshi,
Mingru Su,
Xiaowei Li,
Yu Zhou,
Jian ‐Chun Wu,
Yunjian Liu Tags: Research Article Source Type: research
Pushing the Limits of Heat Conduction in Covalent Organic Frameworks Through High ‐Throughput Screening of Their Thermal Conductivity
High-throughput screening of 10,750 covalent organic frameworks for thermal conductivity demonstrates that the strategic modulation of their chemical and structural features can lead to large tunability in their thermal conductivity, which can range from ultralow ( ≈0.02 W m−1 K−1) to exceptionally high ( ≈50 W m−1 K−1) values. AbstractTailor-made materials featuring large tunability in their thermal transport properties are highly sought-after for diverse applications. However, achieving `user-defined ’ thermal transport in a single class of material system with tunability across a wide range of thermal cond...
Source: Small - April 3, 2024 Category: Nanotechnology Authors: Sandip Thakur,
Ashutosh Giri Tags: Research Article Source Type: research
In Situ Photogenerated Radicals of Hydroxyl Substituted Pyrene ‐Based Triphenylamines with Enhanced Transport and Free Doping/Post‐Oxidation for Efficient Perovskite Solar Cells
The pyrene-based HTMs exhibit excellent performance in PSCs with a short-circuit current density (JSC) of 24.71 mA cm−2, open-circuit voltage (Voc) of 1.18 V, and a fill factor (FF) of 80.41%, with the highest PCE of 23.5%, an average PCE of 23.44%, which is the highest PCE reported to-date for PSCs with a pyrene-core based HTM. AbstractThe high-performance hole transporting material (HTM) is one of the most important components for the perovskite solar cells (PSCs) in promoting power conversion efficiency (PCE). However, the low conductivity of HTMs and their additional requirements for doping and post-oxidation great...
Source: Small - April 3, 2024 Category: Nanotechnology Authors: Xiaohui Wang,
Zhixin Xie,
Rongxin Wang,
Ye Xiao,
Kai Yan,
Yu Zhao,
Rui Lin,
Carl Redshaw,
Yonggang Min,
Xinhua Ouyang,
Xing Feng Tags: Research Article Source Type: research
Tuning A ‐Site Cation Deficiency in Pr0.5La0.5BaCo2O5+δ Perovskite to Realize Large‐Scale Hydrogen Evolution at 2000 mA cm−2
A-site cation-deficient strategy is proposed to promote the HER performance of the perovskite catalysts. The lower overpotential (η2000≈ 636 mV), smaller Tafel slope (34.1 mV dec−1), and greater operating stability can be achieved for the first time in as-developed P0.4LBC, compared with commercial Pt/C benchmark. AbstractIndustrial-level hydrogen production from the water electrolysis requires reducing the overpotential (η) as much as possible at high current density, which is closely related to intrinsic activity of the electrocatalysts. Herein, A-site cation deficiency engineering is proposed to screen high-per...
Source: Small - April 3, 2024 Category: Nanotechnology Authors: Kaiqian Li,
Tian Xia,
Ruiping Deng,
Yingnan Dou,
Jingping Wang,
Qiang Li,
Liping Sun,
Lihua Huo,
Hui Zhao Tags: Research Article Source Type: research
