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Synthesis of nanostructures in nanowires using sequential catalyst reactions

机译：使用顺序催化剂反应合成纳米线中的纳米结构

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摘要

Nanowire growth by the vapour-liquid-solid (VLS) process enables a high level of control over nanowire composition, diameter, growth direction, branching and kinking, periodic twinning, and crystal structure. The tremendous impact of VLS-grown nanowires is due to this structural versatility, generating applications ranging from solid-state lighting and single-photon sources to thermoelectric devices. Here, we show that the morphology of these nanostructures can be further tailored by using the liquid droplets that catalyse nanowire growth as a 'mixing bowl', in which growth materials are sequentially supplied to nucleate new phases. Growing within the liquid, these phases adopt the shape of faceted nanocrystals that are then incorporated into the nanowires by further growth. We demonstrate this concept by epitaxially incorporating metal silicide nanocrystals into Si nanowires with defect-free interfaces, and discuss how this process can be generalized to create complex nanowire-based heterostructures.
机译：通过蒸气-液体-固体（VLS）工艺进行的纳米线生长可以对纳米线的组成，直径，生长方向，分支和扭结，周期性孪生和晶体结构进行高度控制。 VLS生长的纳米线的巨大影响是由于这种结构的多功能性，其应用范围从固态照明，单光子源到热电设备。在这里，我们表明，通过使用催化纳米线生长的液滴作为“混合碗”，可以进一步定制这些纳米结构的形态，在该混合碗中依次提供生长材料以成核新相。这些相在液体中生长时，采用多面纳米晶体的形状，然后通过进一步生长将其结合到纳米线中。我们通过将金属硅化物纳米晶体外延地掺入具有无缺陷界面的Si纳米线中来证明这一概念，并讨论了如何将该过程概括化以创建复杂的基于纳米线的异质结构。

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  • 来源
    《Nature Materials》 |2015年第8期|820-825|共6页
  • 作者

    F. Panciera; Y.-C. Chou; M. C. Reuter; D. Zakharov; E. A. Stach; S. Hofmann; F. M. Ross;

  • 作者单位

    Department of Engineering, University of Cambridge, 9 J. J. Thomson Avenue, Cambridge CB3 0FA, UK,IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598, USA;

    IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598, USA,Department of Electrophysics, National Chiao Tung University, 1001 University Road, Hsinchu City 300, Taiwan,Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA;

    IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598, USA;

    Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Department of Engineering, University of Cambridge, 9 J. J. Thomson Avenue, Cambridge CB3 0FA, UK;

    IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598, USA;

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