Title :
UV-enhanced room temperature gas sensor based on hollow sphere SnO2-TiO2
Author :
Sun, J.B. ; Xu, J. ; Yu, Y.S. ; Guan, Y. ; Liu, F.M. ; Lu, G.Y.
Author_Institution :
State Key Lab. on Integrated Optoelectron., Jilin Univ. Region, Jilin, China
Abstract :
Sensing characteristics of the UV-enhanced gas sensor using the SnO2-TiO2 hollow sphere (HS SnO2-TiO2) at room temperature has been investigated. HS SnO2-TiO2 was prepared by coating the TiO2 on the outer- and inner-surfaces of HS SnO2 with hydrolysisof the titanium tetrachloride. HS SnO2 was synthesized by chemically induced self-assembly under hydrothermal condition. The morphology, crystalline structure and optical absorptivity of the HS SnO2-TiO2 were measured by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-Vis absorption spectra. A sensing mechanism related to the SnO2-TiO2 heterojunction as well as UV illumination was proposed.
Keywords :
X-ray diffraction; field emission electron microscopy; gas sensors; scanning electron microscopy; tin compounds; titanium compounds; transmission electron microscopy; FESEM; SnO2-TiO2; UV illumination; UV-enhanced room temperature gas sensor; X-ray diffraction; XRD; crystalline structure; field emission scanning electron microscopy; hydrolysisof; hydrothermal condition; optical absorptivity; room temperature; titanium tetrachloride; transmission electron microscopy; Lead; Lighting; Optical diffraction; Optical films; Optical imaging; Optical sensors; Sensitivity; (UV) light; gas sensor; heterojunction; hollow sphere; room temperature;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems Conference (TRANSDUCERS), 2011 16th International
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-0157-3
DOI :
10.1109/TRANSDUCERS.2011.5969256
