论文标题
通过半导体蒸汽蒸汽 - 液体固合成合成的一维扭曲和管状结构
One-Dimensional Twisted and Tubular Structures of Zinc Oxide by Semiconductor-Catalyzed Vapor-Liquid-Solid Synthesis
论文作者
论文摘要
一维材料（1-D）材料的蒸气液固醇（VLS）合成的新催化剂的探索有望产生新的形态和功能。在这里，对于模型ZnO系统，我们可以使用半导体（GE）催化剂。特别是描述了两个异常的形态：除了通常的直纳米线外，扭曲的纳米线和扭曲的纳米管。扭曲的纳米管显示出较大的空心芯和令人惊讶的高扭曲速率（最高9o/μm），这不可轻松地通过Eshelby Twist模型来解释。 EXATU和原位透射电子显微镜测量的结合表明，空心核心是由于合成过程中GE-ZNO界面的生长与蚀刻之间的竞争而产生的。扭曲速率与弹性刚度的软化一致。这些结果表明，使用非常规的非金属催化剂提供了合成具有潜在有用特性的异常氧化物结构的机会。
The exploration of new catalysts for the vapor-liquid-solid (VLS) synthesis of one-dimensional (1-D) materials promises to yield new morphologies and functionality. Here, we show, for the model ZnO system, that this possible using a semiconductor (Ge) catalyst. In particular, two unusual morphologies are described: twisted nanowires and twisted nanotubes, in addition to the usual straight nanowires. The twisted nanotubes show large hollow cores and surprisingly high twisting rates (up to 9o/μm), which cannot be easily explained through the Eshelby twist model. A combination of ex situ and in situ transmission electron microscopy measurements suggest that the hollow core results from a competition between growth and etching at the Ge-ZnO interface during synthesis. The twisting rate is consistent with a softening of elastic rigidity. These results indicate that the use of unconventional, nonmetallic catalysts provide opportunities to synthesize unusual oxide structures with potentially useful properties.
