An Efficient Route to Nanostructured Tungsten Oxide Films with Improved Electrochromic Properties

Wei Ting Wu, Wen Pin Liao, Jen Sue Chen, Jih Jen Wu

研究成果: Article同行評審

24 引文 斯高帕斯(Scopus)

摘要

An effective chemical route to nanostructured tungsten oxide films derived from a peroxopolytungstic acid (PTA)/thiourea precursor solution is demonstrated. The conventional procedure of preparing the precursor needs more than 24 h for well-mixing and refluxing the PTA-based solution, while the thiourea-assisted approach takes less than 1 h to prepare the precursor solution because the excess hydrogen peroxide can be efficiently eliminated by oxidation of thiourea. With the precursor solution, tungsten oxide films are deposited by spin coating followed by high temperature annealing. The film annealed at 400°C possesses a porous nanostructure of nanocrystalline tungsten oxide embedded in an amorphous tungsten oxide matrix, which arises from the gaseous species released through decomposition of thiourea oxides during annealing. The 400°C-annealed, thiourea-assisted tungsten oxide film exhibits electrochromic (EC) properties superior to those of the film prepared without thiourea, including large transmittance modulation and coloration efficiency, fast response time and adequate reliability. When increasing the annealing temperature to 450°C, the thiourea-assisted tungsten oxide film is also porous but well-crystallized and shows inferior EC properties. Electrochemical impedance spectroscopy analysis indicates that, in addition to the porous structure, a fast charge-transport rate within the solid portion of the 400°C-annealed nanostructured film plays a crucial role in enhancing EC performances of the thiourea-assisted tungsten oxide film.A rapid chemical route to nanostructured tungsten oxide films derived from a peroxopolytungstic acid/thiourea precursor solution is demonstrated (see figure). The film possesses a porous nanostructure of nanocrystalline tungsten oxide embedded in an amorphous tungsten oxide matrix and exhibits superior electrochromic properties of large coloration efficiency, fast response time and adequate reliability.

原文English
頁(從 - 到)3306-3312
頁數7
期刊ChemPhysChem
11
發行號15
DOIs
出版狀態Published - 2010 十月 25

All Science Journal Classification (ASJC) codes

  • 原子與分子物理與光學
  • 物理與理論化學

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