Highly sensitive WO3 hollow-sphere gas sensors.
In this paper, we describe how WO(3) hollow spheres have been synthesized in solution phase by the controlled hydrolysis of WCl(6) using novel carbon microspheres as the templates. All of the products were characterized by X-ray powder diffraction (XRD), scanning electronic microscopy (SEM), and transmission electron microscopy (TEM). The as-synthesized spheres had large diameters of about 400 nm and thin shells of about 30 nm composed of numerous small nanocrystals. Prompted by the porous structure and small crystal size of the shell wall, we constructed WO(3) hollow-sphere gas sensors and found that these sensors had good sensitivity to alcohol, acetone, CS(2), and other organic gases.
Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
Xiao-Lin
XL
Li
Tian-Jun
TJ
Lou
Xiao-Ming
XM
Sun
Ya-Dong
YD
Li