Completely <001> oriented anatase TiO2 nanoarrays: topotactic growth and orientation-related efficient photocatalysis. Issue 33 (29th July 2015)

• Record Type: Journal Article
• Authors: Yang, Jingling; Wu, Qili; He, Shiman; Yan, Jing; Shi, Jianying; Chen, Jian; Wu, Mingmei; Yang, Xianfeng
• Is Part Of: Nanoscale. Volume 7:Issue 33(2015)
• Page Start: 13888
• Page End: 13897
• Publication Date: 2015-07-29
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr03807c
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A topotactic conversion has been proposed to grow highly <001> oriented anatase TiO2 nanoarrays. Photocatalytic efficiency (PE) is perfectly related to the crystallographic preferred orientation (CPO). 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.