Facile Method to Enhance the Adhesion of TiO2 Nanotube Arrays to Ti Substrate

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Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China
Shanghai Advanced Research Institute, Chinese Academy of Sciences, 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China
Cite this: ACS Appl. Mater. Interfaces 2014, 6, 11, 8001–8005
Publication Date (Web):May 21, 2014
Copyright © 2014 American Chemical Society
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The weak adhesion of anodic TiO2 nanotube arrays (TNTAs) to the underlying Ti substrate compromises many promising applications. In this work, a compact oxide layer between TNTAs and Ti substrate is introduced by employing an additional anodization in a fluoride-free electrolyte. The additional anodization results in an about 200 nm thick compact layer near the nanotube bottoms. Scratch test demonstrates that the critical load of TNTAs with the compact oxide layer is a more than threefold increase in comparison with those without the compact layer. Moreover, this facile method can also improve the photoactivity and supercapacitor performances of TNTAs markedly.

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Experimental details, electrochemical impedance spectroscopy of the pristine and treated nanotube arrays, and additional experimental data. This material is available free of charge via the Internet at http://pubs.acs.org.

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