Navale, Y. H. and Navale, S. T. and Ramgir, N. S. and Stadler, F. J. and Gupta, S. K. and Aswal, D. K. and Patil, V. B. (2017) Zinc oxide hierarchical nanostructures as potential NO2 sensors. Sensors and Actuators B: Chemical, 251. pp. 551-563. ISSN 0925-4005

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Abstract

A superficial thermal evaporation method has been employed for the fabrication of hierarchical zinc oxide (ZnO) nanostructured films, composed of nanorods (NR's) and bunch of nanowires (BNW's), on glass substrate and the diverse atmospheric annealing effect on their structural, morphological, compositional, and gas sensing properties has been systematically studied and reported. Structural investigation corroborates the formation of crystalline hexagonal wurtzite ZnO. The arrays of vertically aligned nanorods and bunch of nanowires of ZnO were observed on the substrate surface. As-prepared ZnO NR's and BNW's are utilized as a sensing material for detection of toxic nitrogen dioxide (NO2). The ZnO sensors exhibit high response to NO2 along with rapid response and recovery time values @200 degrees C. In addition, ZnO sensors respond to a very small exposure of NO2 gas i.e. 1 ppm. Furthermore, the developed sensors attain excellent stability and reproducibility in response. Finally, the interaction of NO2 gas molecules with hierarchical nanostructured ZnO sensors has successfully been studied and discussed by employing an electrochemical impedance spectroscopy measurement.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Chemistry > Analytical Chemistry Electrochemistry Instruments/ Instrumentation
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	26 May 2020 11:20
Last Modified:	26 May 2020 11:20
URI:	http://npl.csircentral.net/id/eprint/2962

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