Synthesis of Nanostructured Tungsten Oxide Thin Films

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• 作者：Erika Widenkvist ; Ronald A. Quinlan ; Brian C. Holloway ; Helena Grennberg ; Ulf Jansson
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：October 1, 2008
• 年：2008
• 卷：8
• 期：10
• 页码：3750-3753
• 全文大小：184K
• 年卷期：v.8,no.10(October 1, 2008)
• ISSN：1528-7505

文摘

A facile and inexpensive method to produce thin films of nanostructured tungsten oxide is described. A nanocrystalline tungstite (WO₃·H₂O) film is spontaneously formed when a tungsten substrate is immersed in nitric acid at elevated temperatures. The resulting thin film is composed of plate-like tungstite crystals with edges preferentially directed out from the substrate surface. The tungstite can easily be transformed into WO₃ by annealing. Patterned WO₃·H₂O/W structures can be obtained by a combination of lithographic techniques and etching. In this study, the effect of exposure time, acid concentration, and temperature on the microstructure of the films has been investigated. The potential of this inexpensive synthesis method to produce large-area coatings of nanostructured tungsten oxide as well as patterned films makes it interesting for several different applications, such as batteries, gas sensors, and photocatalysts.