钾钨青铜纳米片的制备、结构与场发射性能研究
Potassium Tungsten Bronze Nanosheets: Synthesis, Structure and Field Emission
钾钨青铜材料具有类似金属的导电性，钾钨青铜的二维纳米结构可能会展示出特殊的物性，具有重要的研究价值。我们首先用简单加热的方法制备了正交结构的钾钨氧纳米片，然后采用相转变的方法还原钾钨氧纳米片，成功制备了钾钨青铜纳米片。扫描电子显微镜观察表明在还原前后，纳米片的形貌无明显改变。用高分透射电子显微镜对钾钨青铜纳米片进行结构研究表明纳米片具有六角结构。X射线光电子谱分析证明纳米片中的钨的价态在还原后发生了变化。钾钨青铜纳米片薄膜展示了良好的场发射特性。研究发现在还原之后，钾钨青铜纳米片的功函数降低，因而有助于场发射性能的提高。
Single crystalline potassium tungsten brone nanosheets were prepared by reducing potassium tungsten oxide nansheets grown on a W foil. The nanosheets have the thickness less than 100 nm and micron-sized smooth surface. A coherent phase transformation from orthorhombic potassium tungsten oxide to hexagonal potassium tungsten bronze is demonstrated in this reaction. Field emission was measured for potassium tungsten oxide and potassium tungsten bronze nanosheet film before and after reduction. Work function decrease and slight morphology change were observed from nanosheet film after reduction.
张耿民、秦景芳、邢英杰
物理学晶体学真空电子技术
物理电子学相转变还原反应功函数
Physical electronicsphase transformationreductionwork function
张耿民,秦景芳,邢英杰.钾钨青铜纳米片的制备、结构与场发射性能研究[EB/OL].(2013-02-06)[2025-08-23].http://www.paper.edu.cn/releasepaper/content/201302-139.点此复制
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