Asymmetrical etching of nanoparticles was achieved by employing interface-confined galvanic replacement reactions. Interfacial Ag nanocubes, nanowires and nanospheres were fabricated into symmetry-reduced cubic, trough-like and spherical nanocups, respectively. The formation of nanocups is attributed to in situ local nanomasking and selective etching of interfacial nanoparticles at the single-nanoparticle level.

中文翻译：

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将Ag纳米颗粒非对称蚀刻到单纳米颗粒水平上对称性降低的双金属纳米杯中†

纳米粒子的不对称蚀刻是通过采用界面受限的电置换反应来实现的。将界面银纳米立方体，纳米线和纳米球分别制成对称性降低的立方，槽状和球形纳米杯。纳米杯的形成归因于原位局部纳米掩模和在单纳米颗粒水平上对界面纳米颗粒的选择性蚀刻。