Influence of substrate morphology on the growth and properties of TiO₂ nanotubes in HBF₄-based electrolyte

详细信息    查看全文

• 作者：Junheng Xing ; Hui Li ; Zhengbin Xia ; ^{cezhbxia@scut.edu.cn" class="auth_mail} ; Jiangqiong Chen ; Yanhong Zhang ; Li Zhong
• 关键词：Titanium ; Nanotube ; Anodization ; Self-assembly ; HBF4
• 刊名：Electrochimica Acta
• 出版年：10 July 2014
• 年：2014
• 卷：134
• 期：Complete
• 页码：242-248
• 全文大小：2294 K

文摘

The present work demonstrates how the growth and photoelectrochemical (PEC) properties of anodic TiO₂ nanotubes (NTs) are influenced by Ti substrates in the new HBF₄ containing electrolyte. Three different Ti substrates, the rough abraded Ti foil, the smooth electropolished Ti and the two-step Ti plate (i.e. the Ti substrate with ordered dimples left by removing the TiO₂ NTs formed in the first-step anodization), are employed for the preparation of TiO₂ NTs. It is revealed that the Ti substrate morphology can largely influence the formation of TiO₂ NTs, particularly in the initial tube generation stage. The two-step Ti substrate has ordered hexagonally distributed dimples which play the role of template for the formation of new TiO₂ NTs. As a result, the TiO₂ NTs grown via a two-step anodization approach have highly ordered structure and extremely smooth sidewalls, hence possess the best PEC performance among the three kinds of substrates.