Fabrication of single crystalline WO3 nano-belts based photoelectric gas sensor for detection of high concentration ethanol gas at room temperature

Publication date: Available online 23 January 2020Source: Sensors and Actuators A: PhysicalAuthor(s): Hua-Liang Yu, Jun Wang, Biao Zheng, Bing-Wen Zhang, Li-Qin Liu, Ying-Wu Zhou, Cheng Zhang, Xiao-Ling XueAbstractWO3 gas sensing material was synthesized by hydrothermal process, exhibiting a belt-like surface morphology. By comparing and analysing the UV-vis absorption spectra, it is shown that the band gap of WO3 nano-belts (NBs) is 0.56 eV larger than that of WO3 nano-particles (NPs). Surface photo-voltage (SPV) spectra and SPV phase spectra indicate that the direction of the surface built-in electric field is from the surface to the bulk of WO3 NBs and the surface band bending is upwards. WO3 NBs based photoelectric gas sensor was assembled for detecting high concentration of C2H5OH at room temperature. The results demonstrate that the WO3 NBs based photoelectric sensor exhibits higher sensitivity and resolution to high concentration (1000 ppm-20000 ppm) of ethanol at room temperature than WO3 NPs based photoelectric sensor. WO3 NBs are promising candidates of gas sensing material used to fabricate photoelectric gas sensor for high concentration C2H5OH detection operating at room temperature.Graphical abstract

Source: Sensors and Actuators A: Physical - January 24, 2020 Category: Physics Source Type: research