Hassan, M Mehedi and Khan, Wasi and Mishra, P and Islam, S S and Naqvi, A H (2017) Enhancement in alcohol vapor sensitivity of Cr doped ZnO gas sensor. Materials Research Bulletin, 93. pp. 391-400. ISSN 0025-5408

PDF - Accepted Version Restricted to Registered users only Download (2028Kb) | Request a copy

Abstract

In this work, we have demonstrated that Cr doping enhances the ethanol sensitivity of ZnO thin film based gas sensor.Cr (0 and 5 wt%) substituted ZnO thin films have been grown on Al2O3 substrate using pre-doped target through RF magnetron sputtering technique. XRD and Raman analyses confirm single phase wurtzite structure of the films and average crystallite size reduces on Cr substitution. SEM images exhibit particles of Cr doped ZnO are more uniform and smaller than the undoped thin film. EDS and XPS spectra revealed successful doping of Cr-(3+) ions and formation of oxygen vacancy on the surface of ZnO film. Moreover, the doping effect enhances the sensitivity of ZnO sensor almost two times and an improvement in the response time/recovery time was also observed. This may be due to increase in surface to volume ratio which leads adsorption of more numbers of ethanol gas molecules at the surface. (c) 2017 Elsevier Ltd. All rights reserved.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sensor and Actuator
Depositing User:	Bidhan Chaudhuri
Date Deposited:	24 Jan 2018 10:43
Last Modified:	29 Jan 2018 05:28
URI:	http://cgcri.csircentral.net/id/eprint/4037

Actions (login required)

View Item