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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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Received: 24 April 2012 / Revised: 18 May 2012 / Accepted: 1 June 2012 / Published: 11 June 2012
(This article belongs to the Section Physical 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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