Flower-like tungsten oxide particles: synthesis, characterization and dimethyl methylphosphonate sensing properties

Yingqiang Zhao; Hongmin Chen; Xiaoying Wang; Junhui He; Yunbo Yu; Hong He

doi:10.1016/j.aca.2010.06.032

Flower-like tungsten oxide particles: synthesis, characterization and dimethyl methylphosphonate sensing properties

Anal Chim Acta. 2010 Aug 18;675(1):36-41. doi: 10.1016/j.aca.2010.06.032. Epub 2010 Jul 1.

Authors

Yingqiang Zhao¹, Hongmin Chen, Xiaoying Wang, Junhui He, Yunbo Yu, Hong He

Affiliation

¹ 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.

PMID: 20708113
DOI: 10.1016/j.aca.2010.06.032

Abstract

Flower-like WO(3) 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 WO(3) nanoflakes (38 Hz/ppm) at a DMMP concentration of 4ppm. Cross-sensitivity results revealed that flower-like WO(3) 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 WO(3) particle was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy.