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Highly sensitive and selective detection of ppb-level NO2 using multi-shelled WO3 yolk-shell spheres
- Authors
- Kim, Jun-Sik; Yoon, Ji-Wook; Hong, Young Jun; Kang, Yun Chan; Abdel-Hady, Faissal; Wazzan, A. A.; Lee, Jong-Heun
- Issue Date
- 28-6월-2016
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- WO3; Yolk-shell sphere; Oxide semiconductor; NO2 sensor
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.229, pp.561 - 569
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 229
- Start Page
- 561
- End Page
- 569
- ISSN
- 0925-4005
- Abstract
- 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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