Journal
ANALYTICA CHIMICA ACTA
Volume 675, Issue 1, Pages 36-41Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2010.06.032
Keywords
Flower-like; Tungsten oxide; Quartz crystal microbalance; Gas sensor; Dimethyl methylphosphonate
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Funding
- Chinese Academy of Sciences (CAS) [KGCX2-YW-111-5]
- National Natural Science Foundation of China-NSAF [10776034]
- National Natural Science Foundation of China [20871118]
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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. (C) 2010 Elsevier B.V. All rights reserved.
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