Preparation and Characterization of Nanosized Titania Sensing Film

摘要

Nanosized titania sensing films were prepared by sol-gel process and the microstructure was characterized. Influence of various factors on the morphologies of the films were studied in details. In order to obtain films with high surface area, Y~(3+), Ce~(3+) and Fe~(3+) were doped in the titania sol. Also titania sol was dispersed in a polymeric solution to get nanosized and porous films. Scanning electron microscope (SEM), atom force microscope (AFM), and x-ray diffraction (XRD) were used to characterize the titania films. SEM, AFM figures indicated that the grain size decreased from about 150 nm to 20 nm when the concentration of additions changed from 0 at% to 55 at% and the film was porous with the grain size less than 30 nm when the titania sol was dispersed in a polymeric solution even when the calcination temperature increased up to 850℃.