Expanding the boundaries of metal deposition: High aspect ratio silver nanoplatelets created by merging nanobelts
Expanding the boundaries of metal deposition: High aspect ratio silver nanoplatelets created by merging nanobelts
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DOI：
10.1016/j.electacta.2018.01.103
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发表时间：
2018-02
影响因子：
6.6
通讯作者：
F. Muench;A. Vaskevich;R. Popovitz‐Biro;T. Bendikov;Y. Feldman;I. Rubinstein
中科院分区：
文献类型：
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作者：
F. Muench;A. Vaskevich;R. Popovitz‐Biro;T. Bendikov;Y. Feldman;I. Rubinstein
金属纳米片（NPL）是一类重要的纳米材料，由于控制其生长的统一机制，其形态多样性受到限制。在这里，我们介绍了一种基于金属络合物表面活性剂的新型化学镀（EP）策略，该策略能够产生各种先前未描述的银NPL结构。我们的 NPL 形成可以被理解为空间填充树突生长的独特例子。与传统的胶体合成类似，堆垛层错促进了面内生长，而{111}上的面外生长则被有效抑制。值得注意的是，钝化延伸到纳米结构边缘，将面内生长限制为随机、局部成核事件，这些成核事件在一组特殊的六个<211>矢量内不断改变方向。通过形成具有相同形态的单独的 NPL 层，面外生长不连续地进行。成核概率在整个反应过程中发生变化，导致沉积物形态从 NPL 上的单个纳米带 (NB) 转变为多孔树突状片材，同时保留内部纳米结构。该合成方法简便、可扩展、可调节，适用于各种基材材料，因此是直接修饰各向异性纳米结构表面的有力工具。
Metal nanoplatelets (NPLs) display an important class of nanomaterials, whose morphological diversity is limited due to the uniform mechanisms governing their growth. Here, we introduce a new electroless plating (EP) strategy based on a metal complex surfactant, which is capable of producing a variety of previously undescribed silver NPL architectures. Our NPL formation can be understood as a unique example of space-filling dendritic growth. Likewise to conventional colloidal syntheses, in-plane growth is promoted by stacking faults, while out-of-plane growth on {111} is efficiently suppressed. Remarkably, the passivation extends to the nanostructure edges, limiting in-plane growth to random, localized nucleation events, which constantly change direction within a privileged set of six <211> vectors. Out-of-plane growth proceeds discontinuously, by the formation of separate NPL layers with the same morphology. The nucleation probabilities change throughout the reaction, causing the deposit morphology to transition from individual nanobelts (NBs) over NPLs to porous dendrite-like sheets, under retention of the internal nanostructure. The synthesis is facile, scalable, tunable and applicable to various substrate materials, and thus represents a powerful tool for the direct modification of surfaces with anisotropic nanostructures.