Selective Detection of NO2 Using Cr-Doped CuO Nanorods

Sensors

Kang-Min Kim¹  Hyun-Mook Jeong¹  Hae-Ryong Kim¹  Kwon-Il Choi¹  Hyo-Joong Kim¹ 

[1] Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea;

关键词: CuO;    Cr₂O₃;    p-type;    gas sensor;    nanostructures;    nanosheets;    nanorods;   

DOI  :  10.3390/s120608013

来源: mdpi

【 摘 要 】

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 (R_a/R_g, R_a: resistance in air, R_g: resistance in gas) to 100 ppm NO₂ was 134.2 at 250 °C, which was significantly higher than that of pure CuO nano-sheets (R_a/R_g = 7.5) and 0.76 at% Cr-doped CuO nanosheets (R_a/R_g = 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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.