Hydrothermal synthesis of one-dimensional tungsten oxide nanostructures using cobalt ammonium sulfate as a structure-directing agent

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• 作者：Shanmugasundaram Rajagopal ; Hae-Min Lee…
• 关键词：Hydrothermal ; Tungsten Oxide ; Nanostructures ; Structure ; directing Agent
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：30
• 期：10
• 页码：1833-1835
• 全文大小：601KB
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• 作者单位：Shanmugasundaram Rajagopal (1)
  Hae-Min Lee (1)
  Kangtaek Lee (2)
  Chang-Koo Kim (1)
  
  1. Department of Chemical Engineering and Division of Energy Systems Research, Ajou University, Suwon, 443-749, Korea
  2. Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 120-749, Korea
  
• ISSN：1975-7220

文摘

Hydrothermal synthesis of one-dimensional tungsten oxide nanostructures was performed using cobalt ammonium sulfate as a structure-directing agent, and the effect of the concentration of cobalt ammonium sulfate on the characteristics of the tungsten oxide nanostructures was investigated. XRD measurements showed that hexagonal tungsten oxide (h-WO3) structures were obtained at a higher concentration of cobalt ammonium sulfate (0.2 M), while cubic tungsten oxide (c-WO3) structures were obtained at a lower concentration of cobalt ammonium sulfate (0.01M). Mixed structures of h-WO3 and c-WO3 were observed at an intermediate concentration of cobalt ammonium sulfate. Morphological studies revealed that h-WO3 appeared as nanowires with a diameter of about 40 nm and an average length of 1 μm. c-WO3 was shaped in pillar-like nanorods with a diameter of about 30 nm. A red-shift in the UV/Vis absorption peak was observed with different phases of tungsten oxide nanostructures.