Efficient suppression of nanograss during porous anodic TiO 2 nanotubes growth
作者： Qunfang Gui , Dongliang Yu , Dongdong Li , Ye Song , Xufei Zhu
DOI: 10.1016/J.APSUSC.2014.07.046
关键词:
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 ions transport and turn yield depressed (photo) electrochemical performance. In order to obtain nanograss-free nanotubes, modified three-step anodization two-layer nanostructure PATNTs were designed avoid nanograss. first layer (L1) obtained by conventional two-step anodization. After washing drying processes, third-step carried out with presence L1 nanotubes. serving as sacrificed layer, etched transformed into nanograss, while ultralong (L2) maintained underneath L1. bi-layer nanograss/nanotubes (L1/L2) then ultrasonically rinsed deionized water remove (L1 layer). Then much longer (L2 layer) intact nanotube mouths could be obtained. Using this novel approach, without can rationally controlled adjusting anodizing times two layers.
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