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http://dx.doi.org/10.4150/KPMI.2016.23.2.102

Effects of Heat Treatment and Viologen Incorporation on Electrochromic Properties of TiO2 Nanotubes  

Cha, Hyeongcheol (Interdisciplinary Program in Creative Engineering, School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
Nah, Yoon-Chae (Interdisciplinary Program in Creative Engineering, School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
Publication Information
Journal of Powder Materials / v.23, no.2, 2016 , pp. 102-107 More about this Journal
Abstract
We demonstrate the electrochromic properties of $TiO_2$ nanotubes prepared by an anodization process and investigate the effects of heat treatment and viologen incorporation on them. The morphology and crystal structure of anodized $TiO_2$ nanotubes are investigated by scanning electron microscopy and X-ray diffraction. As-formed $TiO_2$ nanotubes have straight tubular layers with an amorphous structure. As the annealing temperature increases, the anodized $TiO_2$ nanotubes are converted to the anatase and rutile phases with some cracks on the tube surface and irregular morphology. Electrochemical results reveal that amorphous $TiO_2$ nanotubes annealed at $150^{\circ}C$ have the largest oxidation/reduction current, which leads to the best electrochromic performance during the coloring/bleaching process. Viologen-anchored $TiO_2$ nanotubes show superior electrochromic properties compared to pristine $TiO_2$ nanotubes, which indicates that the incorporation of a viologen can be an effective way to enhance the electrochromic properties of $TiO_2$ nanotubes.
Keywords
$TiO_2$ nanotubes; Anodization; Electrochromism; Heat treatment; Viologen;
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Times Cited By KSCI : 1  (Citation Analysis)
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