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Effects of sintering temperature on sensing properties of WO(3) and Ag-WO(3) electrode for NO(2) sensor
Pure WO(3) and Ag-WO(3) (mixed solid solutions Ag with WO(3)) have been successfully synthesized by sol-gel method and the influences of calcination temperature on the particle size, morphology of the WO(3) and Ag-WO(3) nanoparticles were investigated. Powder X-ray diffraction results show that the...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6227965/ https://www.ncbi.nlm.nih.gov/pubmed/30473796 http://dx.doi.org/10.1098/rsos.171691 |
Sumario: | Pure WO(3) and Ag-WO(3) (mixed solid solutions Ag with WO(3)) have been successfully synthesized by sol-gel method and the influences of calcination temperature on the particle size, morphology of the WO(3) and Ag-WO(3) nanoparticles were investigated. Powder X-ray diffraction results show that the hexagonal to monoclinic phase transition occurs at calcination temperature varying from 300°C to 500°C. SEM images show that calcination temperature plays an important role in controlling the particle size and morphology of the as-prepared WO(3) and Ag-WO(3) nanoparticles. The NO(2) gas sensing properties of the sensors based on WO(3) and Ag-WO(3) nanoparticles calcined at different temperatures were investigated and the experimental results exhibit that the gas sensing properties of the Ag-WO(3) sensors were superior to those of the pure WO(3). Especially, the sensor based on Ag-WO(3) calcined at 500°C possessed larger response, better selectivity, faster response/recovery and better longer-term stability to NO(2) than the others at relatively low operating temperature (150°C). |
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