A Catalyzed-Growth Route to Directly Form Micropatterned WO2 and WO3 Nanowire Arrays with Excellent Field Emission Behaviors at Low Temperature

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• 作者：Fei Liu ; Li Li ; Fuyao Mo ; Jun Chen ; Shaozhi Deng ; Ningsheng Xu
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：December 1, 2010
• 年：2010
• 卷：10
• 期：12
• 页码：5193-5199
• 全文大小：1052K
• 年卷期：v.10,no.12(December 1, 2010)
• ISSN：1528-7505

文摘

By adjusting the type of catalysts, the controlled growth of micropatterned WO₂ and WO₃ nanowire arrays has been first accomplished at low temperature (450−600 °C). The as-prepared WO₂ and WO₃ nanowires are proven to be single crystalline structures with a single phase by Raman and transmission electron microscopy (TEM) techniques. Their formation mechanisms are attributed to the vapor−liquid−solid (VLS) mechanism. It is found that both micropatterned WO₂ and WO₃ nanowire arrays have very excellent field emission (FE) properties with quite low turn-on field (1.36 V/μm) and threshold field (2.38 V/μm), which is very similar to carbon nanotubes (CNTs) with best FE behaviors. In addition, the physical properties of an individual WO₂ and individual WO₃ nanowire are compared to probe the determinant factor for their different FE behaviors and understand their FE mechanism. Their very excellent FE performance suggests that this novel growth method is a useful technique for low-temperature preparation of micropatterned nanoemitter cathode arrays.