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Soft Supracrystals of Au Nanocrystals with Tunable Mechanical Properties

机译：具有可调力学性能的金纳米晶体的软超晶体

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摘要

The elastic properties of highly ordered three-dimensional colloidal crystals of gold nanocrystals (called supracrystals) are reported. This study is based on the simultaneous growth of two kinds of gold nanocrystal supracrystals that range in size from 5 nm to 8 nm: interfacial supracrystals and precipitated supracrystals. The elastic properties are deduced from nanoindentation measurements performed with an atomic force microscope. The Young's modulus of the interfacial supracrystals, which grow layer-by-layer and form well-defined films, is compared to that of precipitated supracrystals, which are produced by homogeneous growth in solution. For the precipitated supracrystals, characterized by a thickness larger than 1 (am, the Oliver and Pharr model is used to determine the elastic moduli, which are in the giga-pascal range and decrease with increasing nanocrystal size. For the interfacial supracrystals, with 300 nm average thickness, a second model (plate model) is applied in addition to the Oliver and Pharr model. These two models confirm independently that the interfacial films are very soft with Young's modulus in the range of 80-240 MPa. This result reveals a totally new feature of nanocrystal solids, never emphasized before. It is shown that these changes in the Young's modulus are related to the supracrystal growth mechanism.
机译：报道了金纳米晶体（称为超晶体）的高度有序的三维胶体晶体的弹性特性。这项研究基于两种同时生长的金纳米晶超晶，其尺寸范围从5 nm到8 nm：界面超晶和沉淀超晶。弹性性质是由用原子力显微镜进行的纳米压痕测量得出的。将逐层生长并形成清晰膜的界面超晶的杨氏模量与通过溶液中均匀生长而产生的沉淀超晶的杨氏模量进行比较。对于特征为厚度大于1（am）的沉淀的超晶，使用Oliver和Pharr模型确定弹性模量，其弹性模量在十亿帕斯卡范围内，并随纳米晶尺寸的增加而减小。对于界面超晶，则为300平均厚度为nm，除Oliver和Pharr模型外，还应用了第二种模型（平板模型），这两个模型独立地证实了界面膜非常柔软，杨氏模量在80-240 MPa范围内。纳米晶体固体具有全新的特性，以前从未强调过，这表明杨氏模量的这些变化与超晶体的生长机理有关。

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  • 来源
    《Advanced Functional Materials》 |2013年第18期|2315-2321|共7页
  • 作者

    Cong Yan; I mad Arfaoui; Nicolas Goubet; Marie-Paule Pileni;

  • 作者单位

    Laboratoire des Materiaux Mesoscopiques et Nanometriques University Pierre &. Marie Curie BP 52, 4 Place Jussieu, 75005 Paris, France;

    Laboratoire des Materiaux Mesoscopiques et Nanometriques University Pierre &. Marie Curie BP 52, 4 Place Jussieu, 75005 Paris, France;

    Laboratoire des Materiaux Mesoscopiques et Nanometriques University Pierre &. Marie Curie BP 52, 4 Place Jussieu, 75005 Paris, France;

    Laboratoire des Materiaux Mesoscopiques et Nanometriques University Pierre &. Marie Curie BP 52, 4 Place Jussieu, 75005 Paris, France;

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