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Multistage Coloring Electrochromic Device Based on TiO 2 Nanotube Arrays Modified with WO 3 Nanoparticles
Author(s) -
Song YanYan,
Gao ZhiDa,
Wang JianHua,
Xia XingHua,
Lynch Robert
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201002258
Subject(s) - electrochromism , materials science , nanotube , nanoparticle , nanotechnology , electrochromic devices , deposition (geology) , chemical bath deposition , optoelectronics , chemical engineering , thin film , carbon nanotube , electrode , biology , paleontology , chemistry , engineering , sediment
WO 3 nanoparticles loaded in TiO 2 nanotube arrays, fabricated by a chemical bath deposition (CBD) technique in combination with a pyrolysis process, is uniform and the diameter can be easily adjusted by the deposition times. The resultant hybrid nanotubes array shows a multistage coloring electrochromic response at different potential bias. The formation of a 3‐dimensional WO 3 /TiO 2 junction promotes unidirectional charge transport due to the one‐dimensional features of the tubes, which leads to the significant positive‐shift onset potential of the cathodic reaction (ion insertion) and the highly increased proton storage capacity. Compared to non‐decorated nanotube arrays, the enhanced electrochromic properties of longer lifetime, higher contrast ratio (bleaching time/coloration time), and improved tailored electrochromic behavior could be achieved using the composite films.