Lim Jae-Hong, Shin Gyeong-Jin, Hwang Tae-Yeon, Lim Hyo-Ryoung, Lee Young-In, Lee Kyu-Hwan, Kim Sung-Dae, Oh Min-Wook, Park Su-Dong, Myung Nosang V, Choa Yong-Ho
Electrochemistry Department, Korea Institute of Materials Science, Changwon 641-831, Korea.
Nanoscale. 2014 Oct 21;6(20):11697-702. doi: 10.1039/c4nr02469a. Epub 2014 Jul 3.
Three-dimensional hybrid nanostructures (i.e., Te "nanobranches" on a Si "nanotrunk" or Te "nanoleaves" on a Si "nanotrunk") were synthesized by combining the gold-assisted chemical etching of Si to form Si "nanotrunks" and the galvanic displacement of Si to form Te "nanobranches" or "nanoleaves." By adjusting the composition of the electrolyte used for the galvanic displacement reaction, the shape of the Te nanostructures could be changed from nanoleaves to nanobranches. The Si nanotrunks with Te nanobranches showed stronger luminescent emission in the visible region, with their Raman spectrum having a higher wave number, owing to their grain size being larger. This suggested that the optical and photoelectrochemical properties of Te-Si hybrid nanostructures depend on their shape and size. Using this approach, it should be possible to fabricate various hierarchical nanostructures for use in photoelectronic and photoelectrochemical devices.
通过结合金辅助化学蚀刻硅以形成硅“纳米主干”以及硅的电化置换以形成碲“纳米分支”或“纳米叶片”，合成了三维混合纳米结构（即硅“纳米主干”上的碲“纳米分支”或硅“纳米主干”上的碲“纳米叶片”）。通过调整用于电化置换反应的电解质的组成，碲纳米结构的形状可以从纳米叶片变为纳米分支。具有碲纳米分支的硅纳米主干在可见光区域表现出更强的发光发射，其拉曼光谱具有更高的波数，这是由于其晶粒尺寸更大。这表明碲 - 硅混合纳米结构的光学和光电化学性质取决于它们的形状和尺寸。使用这种方法，应该有可能制造出用于光电子和光电化学器件的各种分级纳米结构。
