期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 229, 期 -, 页码 288-296出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.11.093
关键词
CO2 gas sensor; Porous La-loaded ZnO; Hydrothermal method; p-n Type electrical behavior
资金
- International Collaborative RAMP
- D Program through a KIAT - MOTIE [N0000894]
- Korean Health Technology RAMP
- D project - Ministry of Health Welfare [H113C1527]
- National Research Foundation (NRF) by the Korea government [2015R1A2A2A05001405, 2015R1A4A1041746]
- National Research Foundation of Korea [2015R1A2A2A05001405] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The use of semiconducting metal oxides to develop highly sensitive CO2 chemi-resistive sensing systems remains an important scientific challenge in the field of gas sensing. In this work, we describe the synthesis, characterization, and application of a very important CO2 gas sensing material ZnO-loaded with different atomic percentages of La prepared by a simple hydrothermal method. Synthesized samples were structurally and thermally characterized. The CO2 sensing characteristics of pure ZnO and La-loaded ZnO were compared using a homemade gas sensing measurement system. The sensitivity, operating temperature, and response/recovery time were systematically investigated based on the change in electrical resistance of the materials in the presence of CO2. Experimental results confirmed that 50 at% La-loaded ZnO showed a maximum response to 5000 ppm CO2 (65%) at an operating temperature of 400 degrees C. The sensing mechanism of the pure and La-loaded ZnO nanopowders is discussed in detail. We believed that the La-loaded, flower-like ZnO nanopowder offers a potential platform for semiconductor-oxide-based CO2 gas sensors. (C) 2016 Published by Elsevier B.V.
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