%0 Journal Article
%T Studies on Principle£¬ Expression and Characteristics of Gas Sensing Response of WO 3 Prepared by Hydrothermal Method
%A YE Li-juan
%A YANG Xiao-hong
%A LI Wan-jun
%A FU Hong-wei
%J Journal of Chongqing Normal University
%D 2013
%I Chongqing Normal University
%X WO 3 has gained considerable interest recently as a promising material for a variety of applications£¬especially in gas sensor field.This article provides a review of the principle and expression of gas sensing response as well as the current experimental efforts on the hydrothermal synthesis and gas sensing characteristics of WO 3.The morphologies and structures of WO 3 determine the gas sensing characteristics to a large extent.Because the increase of active surface area or surface to volume ratio would enhance the properties for detecting gases£¬small sizes of grains need to be decreased.Among the numerous preparation methods£¬hydrothermal synthesis is easily used to grow various desired morphologies and structures with small sizes.Adding some assisting agents helps to tune the size£¬surface morphology£¬shape and crystalline structure of WO 3 in the hydrothermal process.Most of work on gas detection has been devoted to the improvement of sensitivity£¬detecting low concentration target gas and the increase of gas types.In fact£¬well advancements have been gained in these aspects by optimizing the grow method£¬dopant£¬electrode and so on.However£¬these WO 3 based gas sensor just usually performed well above 150 ¡æ.Therefore£¬this paper also points out some trends for future investigation.Seeking new dopant material£¬controlling the preparation conditions accurately and making use of the very assisting agents to optimize the gas sensing characteristics of WO 3 are the widely approaches.Additionally£¬change the manner to detect the gases£¬such as recording the change of optical properties of WO 3 based sensor instead of the electrical properties.
%K WO 3
%K gas sensing characteristics
%K hydrothermal method
%U http://journal.cqnu.edu.cn/1301/pdf/130119.pdf