title: Completely <001> oriented anatase TiO2 nanoarrays: topotactic growth and orientation-related efficient photocatalysis.
abstract: A TiO2 film has been facilely grown on a Ti foil via a general and simple acid vapor oxidation (AVO) strategy. Based on detailed characterization by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), we found that the TiO2 film was composed of anatase nanoarrays highly oriented along their <001> direction, resulting in a large exposed {001} top surface on the film. The growth mechanism based on a topotactic transformation was proposed according to a careful study of time-dependent experimental results. Resulting from the evaluation of photocatalytic performance compared with a commercial TiO2 photocatalyst (Degussa P25), the as-prepared oriented anatase TiO2 film showed higher efficiency for degradation of atrazine and acid orange II (AOII). The performance of photocatalysis is highly relevant to the preferential orientation. The efficient photocatalysis could be attributed to the highly reactive {001} facets on the anatase nanoarrays with super-hydrophilicity.
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Key Laboratory of Environment and Energy Chemistry of Guangdong Higher Education Institutes, School of Chemistry and Chemical Engineering and Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou, 510275, P. R. China. ceswmm@mail.sysu.edu.cn.
authors.forename: Jingling
authors.initials: J
authors.lastname: Yang
authors.forename: Qili
authors.initials: Q
authors.lastname: Wu
authors.forename: Shiman
authors.initials: S
authors.lastname: He
authors.forename: Jing
authors.initials: J
authors.lastname: Yan
authors.forename: Jianying
authors.initials: J
authors.lastname: Shi
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Mingmei
authors.initials: M
authors.lastname: Wu
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Yang