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Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis

ZnO-based electrochemical impedance sensors are expected to play an increasing role in environmental monitoring, and recent technological advances are certain to facilitate the application of chemical-sensing devices. In this work, ZnO was successfully synthesized on porous Si (PSi) substrates by ca...

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Main Authors:	Husairi, F.S., Rouhi, J., Eswar, K.A., Ooi, Chong Heng Raymond, Rusop, M., Abdullah, S.
Format:	Article
Published:	Elsevier 2015
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://eprints.um.edu.my/16424/ https://doi.org/10.1016/j.sna.2015.10.013
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spelling	my.um.eprints.164242019-10-09T07:57:16Z http://eprints.um.edu.my/16424/ Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis Husairi, F.S. Rouhi, J. Eswar, K.A. Ooi, Chong Heng Raymond Rusop, M. Abdullah, S. TA Engineering (General). Civil engineering (General) ZnO-based electrochemical impedance sensors are expected to play an increasing role in environmental monitoring, and recent technological advances are certain to facilitate the application of chemical-sensing devices. In this work, ZnO was successfully synthesized on porous Si (PSi) substrates by catalytic immersion method to study an ethanol-solution sensor. The structural and optical properties of ZnO/PSi nanostructures were characterized using photoluminescence, X-ray diffraction (XRD) spectroscopy, and field-emission scanning electron microscopy (FESEM). Sensing performance was examined by a simple and reliable electrochemical impedance spectroscopy (EIS) technique. FESEM images indicated that PSi pores were filled by small particles with uniform grain size with increased stabilizer concentration. At higher concentrations, a slight position shift of XRD peaks to a lower angle occurred, and this finding may be due to decreased tensile stress in ZnO thin films. Results showed excellent performance in sensor response to ethanol solution at stabilizer concentration of 0.4M which can be attributed to the high concentration of oxygen defects in the form of interstitial oxygen and deep-level defects introduced into the film. (C) 2015 Elsevier B.V. All rights reserved. Elsevier 2015 Article PeerReviewed Husairi, F.S. and Rouhi, J. and Eswar, K.A. and Ooi, Chong Heng Raymond and Rusop, M. and Abdullah, S. (2015) Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis. Sensors and Actuators A: Physical, 236. pp. 11-18. ISSN 0924-4247 https://doi.org/10.1016/j.sna.2015.10.013 doi:10.1016/j.sna.2015.10.013
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Husairi, F.S. Rouhi, J. Eswar, K.A. Ooi, Chong Heng Raymond Rusop, M. Abdullah, S. Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
description	ZnO-based electrochemical impedance sensors are expected to play an increasing role in environmental monitoring, and recent technological advances are certain to facilitate the application of chemical-sensing devices. In this work, ZnO was successfully synthesized on porous Si (PSi) substrates by catalytic immersion method to study an ethanol-solution sensor. The structural and optical properties of ZnO/PSi nanostructures were characterized using photoluminescence, X-ray diffraction (XRD) spectroscopy, and field-emission scanning electron microscopy (FESEM). Sensing performance was examined by a simple and reliable electrochemical impedance spectroscopy (EIS) technique. FESEM images indicated that PSi pores were filled by small particles with uniform grain size with increased stabilizer concentration. At higher concentrations, a slight position shift of XRD peaks to a lower angle occurred, and this finding may be due to decreased tensile stress in ZnO thin films. Results showed excellent performance in sensor response to ethanol solution at stabilizer concentration of 0.4M which can be attributed to the high concentration of oxygen defects in the form of interstitial oxygen and deep-level defects introduced into the film. (C) 2015 Elsevier B.V. All rights reserved.
format	Article
author	Husairi, F.S. Rouhi, J. Eswar, K.A. Ooi, Chong Heng Raymond Rusop, M. Abdullah, S.
author_facet	Husairi, F.S. Rouhi, J. Eswar, K.A. Ooi, Chong Heng Raymond Rusop, M. Abdullah, S.
author_sort	Husairi, F.S.
title	Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
title_short	Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
title_full	Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
title_fullStr	Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
title_full_unstemmed	Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
title_sort	ethanol solution sensor based on zno/psi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis
publisher	Elsevier
publishDate	2015
url	http://eprints.um.edu.my/16424/ https://doi.org/10.1016/j.sna.2015.10.013
_version_	1648736141500743680
score	13.211869

Ethanol solution sensor based on ZnO/PSi nanostructures synthesized by catalytic immersion method at different molar ratio concentrations: an electrochemical impedance analysis

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