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Flower-like tungsten oxide particles: Synthesis, characterization and dimethyl methylphosphonate sensing properties |
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| Authors: | Yingqiang Zhao Hongmin Chen Junhui He Yunbo Yu |
| Affiliation: | a Functional Nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancun Beiyitiao 2, Haidianqu, Beijing 100190, China b Graduate University of Chinese Academy of Sciences, Beijing 100049, China c Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China |
| Abstract: | Flower-like WO3 particles with high specific surface area were synthesized via a template/surfactant-free way. Scanning and transmission microscopies and X-ray diffraction were applied to investigate the formation mechanism of the morphology. Gas sensing characterization showed an enhanced sensitivity (70 Hz/ppm) to dimethyl methylphosphonate (DMMP) as compared with previously reported WO3 nanoflakes (38 Hz/ppm) at a DMMP concentration of 4 ppm. Cross-sensitivity results revealed that flower-like WO3 still showed sound sensitivity in presence of interfering agents, which benefited from its intrinsic high sensitivity. The mechanism of DMMP adsorption on the flower-like WO3 particle was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy. |
| Keywords: | Flower-like Tungsten oxide Quartz crystal microbalance Gas sensor Dimethyl methylphosphonate |
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