Assembling tungsten oxide hydrate nanocrystal colloids formed by laser ablation in liquid into fast-response electrochromic films

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• 作者：Shalong Wang¹ ; Kang Dou¹ ; Yousheng Zou ; ^{yshzou75@njust.edu.cn} ; Yuhang Dong ; Jubin Li ; Dan Ju ; Haibo Zeng ; ^{zeng.haibo@njust.edu.cn}
• 关键词：Tungsten oxide hydrate ; Electrochromic properties ; Laser ablation in liquid ; Electrophoresis ; Colloidal nanocrystals
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：489
• 期：Complete
• 页码：85-91
• 全文大小：1587 K
• 卷排序：489

文摘

High-performance electrochromic films based on tungsten oxide hydrate ([WO2(O2)H2O]·1.66H2O) colloidal nanocrystals with fast switching speed were fabricated by laser ablation in a mixture of water and hydrogen peroxide followed by electrophoretic methods. Through electrophoretic deposition, the nanoparticles in the colloids synthesized by laser ablation aggregated onto the FTO coated glass substrate forming a lager cell with a uniform size of around 200 nm, which subsequently self-assembled into a porous tungsten oxide hydrate film. By optimizing the electrophoretic time (800 s) and voltage (−0.5 V), the mesh-like porous tungsten oxide hydrate film achieved a wide optical modulation of 32% at 632 nm, fast coloration and bleaching response speed of 7.8 s and 1.7 s respectively due to the synergetic effect of the unique atomic structure of [WO2(O2)H2O]·1.66H2O and porous structure with large surface area that facilitates the ion insertion/extraction. Thus the tungsten oxide hydrate can be a promising electrochromic material for practical applications.