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首页> 外文期刊>Advanced Functional Materials >In Situ Scanning Electron Microscopy Observation of Growth Kinetics and Catalyst Splitting in Vapor-Liquid-Solid Growth of Nanowires
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In Situ Scanning Electron Microscopy Observation of Growth Kinetics and Catalyst Splitting in Vapor-Liquid-Solid Growth of Nanowires

机译：原位扫描电子显微镜观察纳米线的汽-液-固生长中的生长动力学和催化剂分裂

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摘要

In situ observations during vapor-liquid-solid (VLS) growth of semiconductor nanowires in the chamber of an environmental scanning electron microscope (ESEM) are reported. For nanowire growth, a powder mixture of CdS and ZnS is used as a source material and silver nanoparticles as a metal catalyst. Through tracing growth kinetics of nanowires, it is found that nanowires with a relatively bigger catalyst droplet on the tip grow faster. Intriguingly, it is also found that the growth of nanowires can involve catalyst splitting: while the majority of catalyst remains at the nanowire tip and continues facilitating the growth, a portion of it is removed from the tip due to the splitting. It remains attached to the nanowire at the position where the splitting occurred and subsequently induces the growth of a nanowire branch. As far as it is known, this is the first time that catalyst splitting is revealed experimentally in situ. It is proposed that the instability of catalyst droplet caused by the volume increase is the main reason for the splitting. It is believed that in situ growth inside the ESEM can largely enrich our understanding on the metal-catalyzed VLS growth kinetics, which may open up more opportunities for morphology-controlled synthesis of 1D semiconductor nanowires in future study.
机译：据报道，在环境扫描电子显微镜（ESEM）的腔室中，半导体纳米线在气-液-固（VLS）生长期间的原位观察。对于纳米线生长，将CdS和ZnS的粉末混合物用作原料，将银纳米颗粒用作金属催化剂。通过追踪纳米线的生长动力学，发现在尖端具有相对较大的催化剂液滴的纳米线生长更快。有趣的是，还发现纳米线的生长可能涉及催化剂分裂：虽然大多数催化剂保留在纳米线尖端并继续促进生长，但由于分裂，一部分催化剂从尖端中移出。它在发生分裂的位置保持附着在纳米线上，并随后诱导纳米线分支的生长。据了解，这是首次在实验中现场揭示催化剂的分解。提出由体积增加引起的催化剂液滴的不稳定性是分裂的主要原因。相信ESEM内部的原位生长可以大大丰富我们对金属催化的VLS生长动力学的理解，这可能为一维半导体纳米线的形态控制合成提供更多的机会，以供将来研究。

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  • 来源
    《Advanced Functional Materials》 |2015年第37期|5979-5987|共9页
  • 作者

    Huang Xing; Wang Zhu-Jun; Weinberg Gisela; Meng Xiang-Min; Willinger Marc-Georg;

  • 作者单位

    Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China.;

    Fritz Haber Inst, Max Planck Soc, Dept Inorgan Chem, D-14195 Berlin, Germany.;

    Fritz Haber Inst, Max Planck Soc, Dept Inorgan Chem, D-14195 Berlin, Germany.;

    Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China.;

    Fritz Haber Inst, Max Planck Soc, Dept Inorgan Chem, D-14195 Berlin, Germany.;

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