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Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires

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Main Author: Tran, Thi Ngoc Hoa
Other Authors: Dang, Thi Thanh Le
Format: Article
Language:English
Published: Materials Today Communications, 26 (2021) 102094 2021
Subjects:
SnO2 nanowires
n-SnO2/n-WO3 heterojunctions
H2S sensors
Online Access:https://www.sciencedirect.com/science/article/abs/pii/S2352492821000866?via%3Dihub
https://dlib.phenikaa-uni.edu.vn/handle/PNK/1930
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spelling oai:localhost:PNK-19302022-08-17T05:54:45Z Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires Tran, Thi Ngoc Hoa Dang, Thi Thanh Le Nguyen, Van Toan Chu, Manh Hung Nguyen, Van Hieu Nguyen, Duc Hoa SnO2 nanowires n-SnO2/n-WO3 heterojunctions H2S sensors Q The enhancement of the H2S gas-sensing performance of SnO2 nanowires is vital for practical application. In this study, H2S gas sensors based on WO3-coated SnO2 nanowires were fabricated through a two-step process, namely, the chemical vapor deposition of SnO2 nanowires and then coating with WO3 by sputtering method. The morphology and crystal structures of the SnO2 nanowires coated with WO3 were investigated by field-emission scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The H2S gas-sensing properties of the fabricated sensors were tested at temperatures of 150–250 °C. The SnO2 nanowires coated with 5 nm WO3 showed the best response to low-concentration H2S gas (0.1–1 ppm). At the optimal working temperature of 200 °C, the sensor had a sensitivity of 177 toward 1 ppm H2S with good selectivity over the contamination of NO2, NH3, H2, and CO gases. We also discussed the gas-sensing mechanism of the fabricated sensor based on the n–n heterojunction between n-type SnO2 and n-type WO3, which formed a thick depletion layer and thus enhanced the sensitivity to H2S. 2021-07-05T07:27:22Z 2021-07-05T07:27:22Z 2021 Article https://www.sciencedirect.com/science/article/abs/pii/S2352492821000866?via%3Dihub https://dlib.phenikaa-uni.edu.vn/handle/PNK/1930 10.1016/j.mtcomm.2021.102094 en application/pdf Materials Today Communications, 26 (2021) 102094
institution Digital Phenikaa
collection Digital Phenikaa
language English
topic SnO2 nanowires
n-SnO2/n-WO3 heterojunctions
H2S sensors
spellingShingle SnO2 nanowires
n-SnO2/n-WO3 heterojunctions
H2S sensors
Tran, Thi Ngoc Hoa
Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires
description Q
author2 Dang, Thi Thanh Le
author_facet Dang, Thi Thanh Le
Tran, Thi Ngoc Hoa
format Article
author Tran, Thi Ngoc Hoa
author_sort Tran, Thi Ngoc Hoa
title Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires
title_short Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires
title_full Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires
title_fullStr Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires
title_full_unstemmed Highly selective H2S gas sensor based on WO3-coated SnO2 nanowires
title_sort highly selective h2s gas sensor based on wo3-coated sno2 nanowires
publisher Materials Today Communications, 26 (2021) 102094
publishDate 2021
url https://www.sciencedirect.com/science/article/abs/pii/S2352492821000866?via%3Dihub
https://dlib.phenikaa-uni.edu.vn/handle/PNK/1930
_version_ 1751856255570280448
score 8.889492

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