Silicon Nanosheets and Their Self-Assembled Regular Stacking Structure
Silicon Nanosheets and Their Self-Assembled Regular Stacking Structure
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DOI：
10.1021/ja908827z
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发表时间：
2010-03-03
影响因子：
15
通讯作者：
Nakano, Hideyuki
中科院分区：
文献类型：
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作者：
Okamoto, Hirotaka;Kumai, Yoko;Nakano, Hideyuki
硅纳米材料由于其尺寸量子化效应，在光子学、电子学或生物传感器件方面具有广阔的应用前景。二维硅纳米片可以帮助实现广泛的量子场，因为它们的纳米级厚度和微米级面积。然而，还没有成功合成具有大横向尺寸和无氧表面的二维硅纳米材料的例子。在这里，我们报告，覆盖有有机基团的无氧硅纳米片可以通过剥离的层状聚硅烷作为与α-癸胺和溶解在有机溶剂中的反应的结果而获得。胺残基与Si（111）面共价结合。据估计，有CA。0.7反应产物中每摩尔Si原子的残基摩尔数。该胺改性层状聚硅烷可溶解在氯仿中并剥离成横向宽1-2 μ m、厚度为纳米量级的纳米片。由于α-癸胺的密集覆盖，纳米片具有非常平坦和光滑的表面，并且它们容易在浓缩状态下自组装以形成规则堆叠的结构。纳米片可以用作构建块来创建各种复合材料。
Silicon nanomaterials are encouraging candidates for application to photonic, electronic, or biosensing devices, due to their size-quantization effects. Two-dimensional silicon nanosheets could help to realize a widespread quantum field, because of their nanoscale thickness and microscale area. However, there has been no example of a successful synthesis of two-dimensional silicon nanomaterials with large lateral size and oxygen-free surfaces. Here we report that oxygen-free silicon nanosheets covered with organic groups can be obtained by exfoliation of layered polysilane as a result of reaction with a-decylamine and dissolution in an organic solvent. The amine residues are covalently bound to the Si(111) planes. It is estimated that there is ca. 0.7 mol of residue per mole of Si atoms in the reaction product. The amine-modified layered polysilane can dissolve in chloroform and exfoliate into nanosheets that are 1-2 mu m wide in the lateral direction and with thicknesses on the order of nanometers. The nanosheets have very flat and smooth surfaces due to dense coverage of a-decylamine, and they are easily self-assembled in a concentrated state to form a regularly stacked structure. The nanosheets could be useful as building blocks to create various composite materials.