Hits:

Indexed by:Journal Papers

Date of Publication:2013-01-01

Journal:PLASMA SCIENCE & TECHNOLOGY

Included Journals:EI、SCIE、Scopus

Volume:15

Issue:1

Page Number:64-69

ISSN No.:1009-0630

Key Words:plasma CVD; TiO2 photocatalytic films; atmospheric-pressure cold plasma; dielectric barrier discharge (DBD); optical emission spectra (OES)

Abstract:To deposit TiO2 films through plasma CVD, the partial pressure ratio of O-2 to TiCl4 should be greater than the stoichiometric ratio (p(O2)/p(TiCl4) > 1). However, this may lead to the formation of powder instead of film on the substrate when using volume dielectric barrier discharge (volume-DBD) at atmospheric pressure. In this study, by adding N-2 into the working gas Ar, TiO2 photocatalytic films were successfully fabricated in the presence of excess O-2 (p(O2)/p(TiCl4) = 2.6) by using a wire-to-plate atmospheric-pressure volume-DBD. The tuning effect of N-2 on the deposition of TiO2 film was studied in detail. The results showed that by increasing the N-2 content, the deposition rate and particle size of the TiO2 film were reduced, and its photocatalytic activity was enhanced. The tuning mechanism of N-2 is further discussed.