期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 229, 期 -, 页码 561-569出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.02.003
关键词
WO3; Yolk-shell sphere; Oxide semiconductor; NO2 sensor
资金
- Deanship of Scientific Research (DSR), King Abdulaziz University (KAU) [2-135-36-HiCi]
- National Research Foundation of Korea (NRF) - Korean Government (MEST) [2013R1A2A1A01006545]
- KAU
- MEST
- National Research Foundation of Korea [2013R1A2A1A01006545] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Triple-shelled, double-shelled, and dense WO3 spheres were prepared by ultrasonic spray pyrolysis and their NO2 gas sensing characteristics were investigated. Triple-shelled WO3 yolk-shell spheres showed an unprecedentedly high response (resistance ratio =100-49.0) to 50 ppb NO2 at 100-200 degrees C with negligible cross-responses to 5 ppm acetone, CO, NH3, ethanol, and toluene, whereas dense WO3 spheres showed low NO2 response (8.9-3.1). The response and selectivity to NO2 were maintained in a highly humid (relative humidity 80%) atmosphere. The ultrahigh response and selectivity of triple-shelled WO3 spheres to several tens ppb levels NO2 was attributed to the enhanced gas accessibility of the yolk-shell morphology with thin and permeable multiple shells. (c) 2016 Elsevier B.V. All rights reserved.
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