CHEN Ting 1,2, ZHANG Xiaojun 1, HU Xiaobo1, JIANG Weihui 1,2, JIANG Wan 2, XIE Zhixiang 1
(1. Jingdezhen Ceramic Institute, Jingdezhen 333001,Jiangxi, China; 2. National Engineering Research Center for Domestic &
Building Ceramics, Jingdezhen 333001, Jiangxi, China)
Abstract: Al-doped ZnO nanoparticles were prepared by non-hydrolytic sol-gel method using zinc chloride and aluminium isopropoxide as raw materials in isopropanol solvent. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were employed to characterize the phase composition and the microstructure of the resulting products, and their gas sensing properties were also measured.The experiment results show that the Al doped ZnO nanoparticles have hexagonal wurtzite structure. The prepared sensor exhibits the highest sensitivity with the 1.5 at% Al-doped ZnO, as 12.07 for 500 ppm formaldehyde at 260 oC. Moreover, it also presents quick response and recover behavior, about 18 s and 12 s, respectively. And the sensitivity of the gas sensor gradually increases with the formaldehyde concentration increasing in the range of 50 to 2000 ppm.
Key words: Zinc oxide; Gas sensor; Formaldehyde; Response-recover