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Hydrogen Sulfide Gas Sensing Capabilities of Solution Processed Vanadium Pentoxide Nanosheets

TitleHydrogen Sulfide Gas Sensing Capabilities of Solution Processed Vanadium Pentoxide Nanosheets
Publication TypeJournal Article
Year of Publication2019
AuthorsJha, RKumar, Sakhuja, N, Jakhar, S, Bhat, N
JournalIEEE Transactions on Nanotechnology
Keywordsatomic force microscopy, Hydrogen, Temperature sensors, Two dimensional displays, Vanadium

Vanadium Pentoxide (V 2 O 5 ) nanosheets, liquid exfoliated in ethanol, were used as sensing material for hydrogen sulfide (H 2 S) detection. The material properties such as morphology, phase, chemical signature were characterized using Field Emission electron microscopy (FESEM), Transmission electron microscopy (TEM), Atomic force microscopy (AFM), X-ray Diffraction (XRD), Raman Spectroscopy, X-ray photoelectron microscopy (XPS). These nanosheets were further dropcasted on Ti/Pt interdigitated electrode (IDE) to fabricate a chemiresistive gas sensing device. The sensors show excellent response towards H2S gas at an operating temperature of 350 °C, when operated in 500 ppb-4 ppm range. The response in this range was found to be varying linearly from 1.5% (for 500 ppb) to 12.8% (for 4 ppm). Response time and recovery time of 71 seconds and 104 seconds for 1 ppm H2S was observed. The hysteresis error (%) of the device was found to be ±4.21% which suggests it to be a good sensing material for H 2 S detection. The device was also tested on other parameters like repeatability, stability and reproducibility and it performs well in these tests indicating exfoliated V 2 O 5 nanosheet as a potential sensing material for chemiresistive devices for H 2 S detection.