Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO2 Gas Sensor Based on Hollow SnO2/ZnO Nanofibers

Semiconducting metal oxides can detect low concentrations of NO2 and other toxic gases, which have been widely investigated in the field of gas sensors. However, most studies on the gas sensing properties of these materials are carried out at high temperatures. In this work, H...

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Autores principales:	Jiahui Guo, Weiwei Li, Xuanliang Zhao, Haowen Hu, Min Wang, Yi Luo, Dan Xie, Yingjiu Zhang, Hongwei Zhu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	electrospinning tin oxide nanofibers zinc oxide gas sensor flexible devices Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/79d7d0247cae4c318314c60b3c98ad18
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spelling	oai:doaj.org-article:79d7d0247cae4c318314c60b3c98ad182021-11-11T18:28:52ZHighly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers10.3390/molecules262164751420-3049https://doaj.org/article/79d7d0247cae4c318314c60b3c98ad182021-10-01T00:00:00Zhttps://www.mdpi.com/1420-3049/26/21/6475https://doaj.org/toc/1420-3049Semiconducting metal oxides can detect low concentrations of NO<sub>2</sub> and other toxic gases, which have been widely investigated in the field of gas sensors. However, most studies on the gas sensing properties of these materials are carried out at high temperatures. In this work, Hollow SnO<sub>2</sub> nanofibers were successfully synthesized by electrospinning and calcination, followed by surface modification using ZnO to improve the sensitivity of the SnO<sub>2</sub> nanofibers sensor to NO<sub>2</sub> gas. The gas sensing behavior of SnO<sub>2</sub>/ZnO sensors was then investigated at room temperature (~20 °C). The results showed that SnO<sub>2</sub>/ZnO nanocomposites exhibited high sensitivity and selectivity to 0.5 ppm of NO<sub>2</sub> gas with a response value of 336%, which was much higher than that of pure SnO<sub>2</sub> (13%). In addition to the increase in the specific surface area of SnO<sub>2</sub>/ZnO-3 compared with pure SnO<sub>2</sub>, it also had a positive impact on the detection sensitivity. This increase was attributed to the heterojunction effect and the selective NO<sub>2</sub> physisorption sensing mechanism of SnO<sub>2</sub>/ZnO nanocomposites. In addition, patterned electrodes of silver paste were printed on different flexible substrates, such as paper, polyethylene terephthalate and polydimethylsiloxane using a facile screen-printing process. Silver electrodes were integrated with SnO<sub>2</sub>/ZnO into a flexible wearable sensor array, which could detect 0.1 ppm NO<sub>2</sub> gas after 10,000 bending cycles. The findings of this study therefore open a general approach for the fabrication of flexible devices for gas detection applications.Jiahui GuoWeiwei LiXuanliang ZhaoHaowen HuMin WangYi LuoDan XieYingjiu ZhangHongwei ZhuMDPI AGarticleelectrospinningtin oxide nanofiberszinc oxidegas sensorflexible devicesOrganic chemistryQD241-441ENMolecules, Vol 26, Iss 6475, p 6475 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	electrospinning tin oxide nanofibers zinc oxide gas sensor flexible devices Organic chemistry QD241-441
spellingShingle	electrospinning tin oxide nanofibers zinc oxide gas sensor flexible devices Organic chemistry QD241-441 Jiahui Guo Weiwei Li Xuanliang Zhao Haowen Hu Min Wang Yi Luo Dan Xie Yingjiu Zhang Hongwei Zhu Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers
description	Semiconducting metal oxides can detect low concentrations of NO<sub>2</sub> and other toxic gases, which have been widely investigated in the field of gas sensors. However, most studies on the gas sensing properties of these materials are carried out at high temperatures. In this work, Hollow SnO<sub>2</sub> nanofibers were successfully synthesized by electrospinning and calcination, followed by surface modification using ZnO to improve the sensitivity of the SnO<sub>2</sub> nanofibers sensor to NO<sub>2</sub> gas. The gas sensing behavior of SnO<sub>2</sub>/ZnO sensors was then investigated at room temperature (~20 °C). The results showed that SnO<sub>2</sub>/ZnO nanocomposites exhibited high sensitivity and selectivity to 0.5 ppm of NO<sub>2</sub> gas with a response value of 336%, which was much higher than that of pure SnO<sub>2</sub> (13%). In addition to the increase in the specific surface area of SnO<sub>2</sub>/ZnO-3 compared with pure SnO<sub>2</sub>, it also had a positive impact on the detection sensitivity. This increase was attributed to the heterojunction effect and the selective NO<sub>2</sub> physisorption sensing mechanism of SnO<sub>2</sub>/ZnO nanocomposites. In addition, patterned electrodes of silver paste were printed on different flexible substrates, such as paper, polyethylene terephthalate and polydimethylsiloxane using a facile screen-printing process. Silver electrodes were integrated with SnO<sub>2</sub>/ZnO into a flexible wearable sensor array, which could detect 0.1 ppm NO<sub>2</sub> gas after 10,000 bending cycles. The findings of this study therefore open a general approach for the fabrication of flexible devices for gas detection applications.
format	article
author	Jiahui Guo Weiwei Li Xuanliang Zhao Haowen Hu Min Wang Yi Luo Dan Xie Yingjiu Zhang Hongwei Zhu
author_facet	Jiahui Guo Weiwei Li Xuanliang Zhao Haowen Hu Min Wang Yi Luo Dan Xie Yingjiu Zhang Hongwei Zhu
author_sort	Jiahui Guo
title	Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers
title_short	Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers
title_full	Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers
title_fullStr	Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers
title_full_unstemmed	Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers
title_sort	highly sensitive, selective, flexible and scalable room-temperature no<sub>2</sub> gas sensor based on hollow sno<sub>2</sub>/zno nanofibers
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/79d7d0247cae4c318314c60b3c98ad18
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Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO<sub>2</sub> Gas Sensor Based on Hollow SnO<sub>2</sub>/ZnO Nanofibers

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