Facet‐selective etching and deposition, as determined by the landscape of surface energy, represent two powerful methods for the transformation of noble‐metal nanocrystals into nanostructures with complex shapes or morphologies. This review highlights the use of these two methods, including integration of them, for the fabrication of novel monometallic and bimetallic nanostructures with enhanced properties. We start with an introduction to the role of surface capping in controlling the facet‐selective etching or deposition on the surface of Ag nanocrystals, followed by a case study of how to maneuver etching and deposition at different facets of Pd nanocrystals for the fabrication of nanoframes. We then introduce the use of galvanic replacement to accomplish selective etching and deposition on two different facets in an orthogonal manner, transforming Pd nanocubes into Pd−Pt octapods. By complementing galvanic replacement with a chemical reduction reaction, it is also feasible to control the rates of these two reactions for the conversion of Ag nanocubes into Ag@Ag−Au concave nanocubes and Ag@Au core‐shell nanocubes. These transformation methods not only greatly increase the shape diversity of metal nanocrystals but also offer nanocrystals with enhanced plasmonic and/or catalytic properties.

中文翻译：

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通过刻面选择性蚀刻和沉积将贵金属纳米晶体转变为复杂的纳米结构

由表面能的分布所决定的刻面选择性蚀刻和沉积代表了两种将贵金属纳米晶体转变为具有复杂形状或形态的纳米结构的有效方法。这篇综述强调了这两种方法的使用，包括它们的集成，用于制造具有增强性能的新型单金属和双金属纳米结构。我们首先介绍了表面封盖在控制Ag纳米晶体表面上的刻面选择性蚀刻或沉积中的作用，然后进行了有关如何操纵Pd纳米晶体不同刻面上的蚀刻和沉积以制造纳米框架的案例研究。 。然后，我们介绍了使用电置换以正交方式在两个不同的面上完成选择性蚀刻和沉积的方法，将Pd纳米立方转变为Pd-Pt八足体。通过用化学还原反应补充电流置换，控制这两个反应的速率也是可行的，以将Ag纳米立方体转化为Ag @ Ag-Au凹形纳米立方体和Ag @ Au核壳纳米立方体。这些转变方法不仅大大增加了金属纳米晶体的形状多样性，而且还提供了具有增强的等离子体和/或催化性能的纳米晶体。