Selective Detection of NO2 Using Cr-Doped CuO Nanorods
- Authors
- Kim, Kang-Min; Jeong, Hyun-Mook; Kim, Hae-Ryong; Choi, Kwon-Il; Kim, Hyo-Joong; Lee, Jong-Heun
- Issue Date
- 6월-2012
- Publisher
- MDPI
- Keywords
- CuO; Cr2O3; p-type; gas sensor; nanostructures; nanosheets; nanorods
- Citation
- SENSORS, v.12, no.6, pp.8013 - 8025
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS
- Volume
- 12
- Number
- 6
- Start Page
- 8013
- End Page
- 8025
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/108226
- DOI
- 10.3390/s120608013
- ISSN
- 1424-8220
- 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 (R-a/R-g, R-a: resistance in air, R-g: resistance in gas) to 100 ppm NO2 was 134.2 at 250 degrees 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.
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