期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 201, 期 -, 页码 482-489出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.05.038
关键词
Gas sensor; Xylene; Toluene; Selectivity; Cr-doped Co3O4
资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2013R1A2A101006545]
- Industrial Strategic Technology Development Program - Ministry of Trade, Industry Energy (KEIT)
- NRF [2012H1A2A1017604]
- National Research Foundation of Korea [2012H1A2A1017604] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ultrasensitive and selective detection of methyl benzenes was achieved for Co3O4 nanorods through Cr-doping. Pure and 1.17-1.89 at% Cr-doped Co3O4 nanorods were synthesized by a solvothermal reaction, followed by calcination at 400 degrees C for 2 h. The gas-sensing properties of the nanorods were tested to methyl benzene (toluene and xylene) and compared with interfering gases (benzene, ethanol, ammonia, CO and NO2) at various concentrations (0.25-5 ppm) and temperatures (250-350 degrees C). The results demonstrated that Cr-doping significantly enhanced the response to methyl benzenes while suppressing cross-responses to interfering gases, resulting in selectivity for methyl benzene. The ultraselectivity to methyl benzene in the Cr-doped Co3O4 nanorods was attributed to catalytic activity and the abundant adsorbed oxygen of the Cr oxides and Co3O4 for the partial oxidation of methyl benzenes to more active chemical species. (C) 2014 Elsevier B.V. All rights reserved.
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