Bio-templated fabrication of hierarchically porous WO3 microspheres from lotus pollens for NO gas sensing at low temperatures

Lotus pollens were used as templates to prepare WO 3 microspheres; the intriguing structural features of the pollens, e.g. hollow sphere with highly porous double shells, were perfectly inherited by the WO 3 microspheres. The hierarchically porous structure of the WO 3 microspheres was ideal for gas...

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Bibliographic Details
Main Authors: Wang, Xiao-Xue, Tian, Kuan, Li, Hua-Yao, Cai, Ze-Xing, Guo, Xin
Format: Article
Language:English
Online Access:Get full text
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Summary:Lotus pollens were used as templates to prepare WO 3 microspheres; the intriguing structural features of the pollens, e.g. hollow sphere with highly porous double shells, were perfectly inherited by the WO 3 microspheres. The hierarchically porous structure of the WO 3 microspheres was ideal for gas sensing. The WO 3 microsphere-based sensor exhibited a high sensitivity ( S = 46.2) to 100 ppm NO gas with a pretty fast response and recovery speed (62 s/223 s) at 200 °C. Compared with NO sensors reported in the literature so far, the WO 3 microsphere-based sensor has among the highest sensitivity and fastest response/recovery. Lotus pollen was used as a template to prepare WO 3 microspheres. The porous structure of the microspheres is ideal for gas sensing. The microsphere-based sensor has high sensitivity ( S = 46.2) to 100 ppm NO gas with fast response and recovery speed 62 s/223 s) at 200 °C.
ISSN:2046-2069
DOI:10.1039/c5ra02536b