Efficient suppression of nanograss during porous anodic TiO2 nanotubes growth

被引:27
作者
Gui, Qunfang [1 ,2 ]
Yu, Dongliang [1 ,2 ]
Li, Dongdong [2 ]
Song, Ye [1 ]
Zhu, Xufei [1 ]
Cao, Liu [1 ]
Zhang, Shaoyu [1 ]
Ma, Weihua [1 ]
You, Shiyu [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China
[2] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China
基金
中国国家自然科学基金;
关键词
Anodic titanium oxide; Nanotubes; Nanograss; Sacrificed layer; SENSITIZED SOLAR-CELLS; ARRAYS; MECHANISM; ANODIZATION; TOP; NANOSTRUCTURE; FABRICATION; MORPHOLOGY; DIAMETER; LENGTH;
D O I
10.1016/j.apsusc.2014.07.046
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
When Ti foil was anodized in fluoride-containing electrolyte for a long time, undesired etching-induced "nanograss" would inevitably generate on the top of porous anodic TiO2 nanotubes (PATNTs). The nanograss will hinder the ions transport and in turn yield depressed (photo) electrochemical performance. In order to obtain nanograss-free nanotubes, a modified three-step anodization and two-layer nanostructure of PATNTs were designed to avoid the nanograss. The first layer (L-1) nanotubes were obtained by the conventional two-step anodization. After washing and drying processes, the third-step anodization was carried out with the presence of L-1 nanotubes. The L-1 nanotubes, serving as a sacrificed layer, was etched and transformed into nanograss, while the ultralong nanotubes (L-2) were maintained underneath the L-1. The bi-layer nanostructure of the nanograss/nanotubes (L-1/L-2) was then ultrasonically rinsed in deionized water to remove the nanograss (L-1 layer). Then much longer nanotubes (L-2 layer) with intact nanotube mouths could be obtained. Using this novel approach, the ultralong nanotubes without nanograss can be rationally controlled by adjusting the anodizing times of two layers. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:505 / 509
页数:5
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