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Sensors 2012, 12(6), 8013-8025; doi:10.3390/s120608013
Article

Selective Detection of NO2 Using Cr-Doped CuO Nanorods

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Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea
* Author to whom correspondence should be addressed.
Received: 24 April 2012 / Revised: 18 May 2012 / Accepted: 1 June 2012 / Published: 11 June 2012
(This article belongs to the Section Chemical Sensors)
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Abstract

CuO nanosheets, Cr-doped CuO nanosheets, and Cr-doped CuO nanorods were prepared by heating a slurry containing Cu-hydroxide/Cr-hydroxide. Their responses to 100 ppm NO2, C2H5OH, NH3, trimethylamine, C3H8, and CO were measured. For 2.2 at% Cr-doped CuO nanorods, the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to 100 ppm NO2 was 134.2 at 250 °C, which was significantly higher than that of pure CuO nano-sheets (Ra/Rg = 7.5) and 0.76 at% Cr-doped CuO nanosheets (Ra/Rg = 19.9). In addition, the sensitivity for NO2 was also markedly enhanced by Cr doping. Highly sensitive and selective detection of NO2 in 2.2 at% Cr-doped CuO nanorods is explained in relation to Cr-doping induced changes in donor density, morphology, and catalytic effects.
Keywords: CuO; Cr2O3; p-type; gas sensor; nanostructures; nanosheets; nanorods CuO; Cr2O3; p-type; gas sensor; nanostructures; nanosheets; nanorods
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Kim, K.-M.; Jeong, H.-M.; Kim, H.-R.; Choi, K.-I.; Kim, H.-J.; Lee, J.-H. Selective Detection of NO2 Using Cr-Doped CuO Nanorods. Sensors 2012, 12, 8013-8025.

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