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Ethanol sensing using CuO/MWNT thin film

Parmar, Mitesh and Bhatia, Ravi and Prasad, V and Rajanna, K (2011) Ethanol sensing using CuO/MWNT thin film. In: Sensors and Actuators B: Chemical, 158 (1). pp. 229-234.

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Official URL: http://dx.doi.org/10.1016/j.snb.2011.06.010

Abstract

Copper (II) oxide (CuO)/multiwall carbon nanotube (MWNT) thin film based ethanol-sensors were fabricated by dispersing CVD-prepared MWNTs in varying concentration over DC magnetron sputtered-CuO films. The responses of these sensors as a function of MWNT concentrations and temperatures were measured, and compared. The sensing response was the maximum at an operating temperature near 400 degrees C for all the samples irrespective of the MWNTs dispersed over them. At optimum operating temperature (T(opt)) of 407 +/- 1 degrees C, the response is linear for 100-700 ppm range and tends to saturate at higher concentrations. In comparison with bare CuO sample, the response of CuO/MWNT sensing films increased up to 50% in the linear range. The response improvement for 2500 ppm of ethanol was up to 90% compared to bare CuO sample. In addition, the sensing response time also reduced to around 23% for lowest ethanol concentration at T(opt). However, a decrease in the sensor response was observed on films with very high concentrations of MWNTs. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Copper (II) oxide thin films;Multiwall carbon nanotubes; Electron microscopy;Gas sensing
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Nov 2011 06:01
Last Modified: 09 Nov 2011 06:01
URI: http://eprints.iisc.ernet.in/id/eprint/41923

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