Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature

Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as CO<sub>2</sub> gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical...

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Autores principales:	Rana Saad, Ahmed Gamal, Mohamed Zayed, Ashour M. Ahmed, Mohamed Shaban, Mohammad BinSabt, Mohamed Rabia, Hany Hamdy
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ZnO/CNTs thin film CO<sub>2</sub> gas sensor response stability spray pyrolysis Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/dd109e6505b64f3b9d1e1a26eadfb230
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id	oai:doaj.org-article:dd109e6505b64f3b9d1e1a26eadfb230
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spelling	oai:doaj.org-article:dd109e6505b64f3b9d1e1a26eadfb2302021-11-25T18:32:20ZFabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature10.3390/nano111130872079-4991https://doaj.org/article/dd109e6505b64f3b9d1e1a26eadfb2302021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3087https://doaj.org/toc/2079-4991Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as CO<sub>2</sub> gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical analyses for all the prepared nanomaterials were performed using X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), and UV/Vis spectrophotometer devices, respectively. According to the XRD analysis, the crystal sizes of ZnO and ZnO/CNTs were approximately 50.4 and 65.2 nm, respectively. CNTs have average inner and outer diameters of about 3 and 13 nm respectively, according to the transmitted electron microscope (TEM), and a wall thickness of about 5 nm. The detection of CO<sub>2</sub> is accomplished by passing varying rates of the gas from 30 to 150 sccm over the prepared thin-film electrodes. At 150 sccm, the sensitivities of ZnO and ZnO/CNTs sensors are 6.8% and 22.4%, respectively. The ZnO/CNTs sensor has a very stable sensitivity to CO<sub>2</sub> gas for 21 days. Moreover, this sensor has a high selectivity to CO<sub>2</sub> in comparison with other gases, in which the ZnO/CNTs sensor has a higher sensitivity to CO<sub>2</sub> compared to H<sub>2</sub> and C<sub>2</sub>H<sub>2</sub>.Rana SaadAhmed GamalMohamed ZayedAshour M. AhmedMohamed ShabanMohammad BinSabtMohamed RabiaHany HamdyMDPI AGarticleZnO/CNTs thin filmCO<sub>2</sub> gassensor responsestabilityspray pyrolysisChemistryQD1-999ENNanomaterials, Vol 11, Iss 3087, p 3087 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ZnO/CNTs thin film CO<sub>2</sub> gas sensor response stability spray pyrolysis Chemistry QD1-999
spellingShingle	ZnO/CNTs thin film CO<sub>2</sub> gas sensor response stability spray pyrolysis Chemistry QD1-999 Rana Saad Ahmed Gamal Mohamed Zayed Ashour M. Ahmed Mohamed Shaban Mohammad BinSabt Mohamed Rabia Hany Hamdy Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature
description	Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as CO<sub>2</sub> gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical analyses for all the prepared nanomaterials were performed using X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), and UV/Vis spectrophotometer devices, respectively. According to the XRD analysis, the crystal sizes of ZnO and ZnO/CNTs were approximately 50.4 and 65.2 nm, respectively. CNTs have average inner and outer diameters of about 3 and 13 nm respectively, according to the transmitted electron microscope (TEM), and a wall thickness of about 5 nm. The detection of CO<sub>2</sub> is accomplished by passing varying rates of the gas from 30 to 150 sccm over the prepared thin-film electrodes. At 150 sccm, the sensitivities of ZnO and ZnO/CNTs sensors are 6.8% and 22.4%, respectively. The ZnO/CNTs sensor has a very stable sensitivity to CO<sub>2</sub> gas for 21 days. Moreover, this sensor has a high selectivity to CO<sub>2</sub> in comparison with other gases, in which the ZnO/CNTs sensor has a higher sensitivity to CO<sub>2</sub> compared to H<sub>2</sub> and C<sub>2</sub>H<sub>2</sub>.
format	article
author	Rana Saad Ahmed Gamal Mohamed Zayed Ashour M. Ahmed Mohamed Shaban Mohammad BinSabt Mohamed Rabia Hany Hamdy
author_facet	Rana Saad Ahmed Gamal Mohamed Zayed Ashour M. Ahmed Mohamed Shaban Mohammad BinSabt Mohamed Rabia Hany Hamdy
author_sort	Rana Saad
title	Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature
title_short	Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature
title_full	Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature
title_fullStr	Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature
title_full_unstemmed	Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature
title_sort	fabrication of zno/cnts for application in co<sub>2</sub> sensor at room temperature
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/dd109e6505b64f3b9d1e1a26eadfb230
work_keys_str_mv	AT ranasaad fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT ahmedgamal fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT mohamedzayed fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT ashourmahmed fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT mohamedshaban fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT mohammadbinsabt fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT mohamedrabia fabricationofznocntsforapplicationincosub2subsensoratroomtemperature AT hanyhamdy fabricationofznocntsforapplicationincosub2subsensoratroomtemperature
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Fabrication of ZnO/CNTs for Application in CO<sub>2</sub> Sensor at Room Temperature

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