Self-Assembly of Nanoclusters into Mono-, Few-, and Multilayered Sheets via Dipole-Induced Asymmetric van der Waals Attraction
Self-Assembly of Nanoclusters into Mono-, Few-, and Multilayered Sheets via Dipole-Induced Asymmetric van der Waals Attraction
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通过偶极子诱导的不对称范德华吸引力将纳米团簇自组装成单层、少层和多层片材
DOI：
10.1021/acsnano.5b01823
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发表时间：
2015
期刊：
影响因子：
17.1
通讯作者：
Yang Bai
中科院分区：
文献类型：
--
作者：
Wu Zhennan;Liu Jiale;Li Yanchun;Cheng Ziyi;Li Tingting;Zhang Hao;Lu Zhongyuan;Yang Bai
具有规则层状结构和多功能化学成分的二维（2D）纳米材料在许多应用中备受期待。尽管范德华 (vdW) 吸引力在构建和维持层状结构中非常重要，但二维各向异性的起源尚未完全了解。在这里，我们报道了配体封端的 Au15 纳米团簇在胶体溶液中二维自组装成单层、少层和多层片材。实验结果和计算机模拟都表明，二维自组装是由纳米尺寸物体中常见的一维偶极引力引发的。 Au15 的密集一维附着导致表面配体的重新分布，从而产生不对称的 vdW 吸引力。对偶极和 vdW 吸引力协调的有意控制进一步允许操纵 2D 自组装结构的厚度和形态。
Two-dimensional (2D) nanomaterials possessing regular layered structures and versatile chemical composition are highly expected in many applications. Despite the importance of van der Waals (vdW) attraction in constructing and maintaining layered structures, the origin of 2D anisotropy is not fully understood, yet. Here, we report the 2D self-assembly of ligand-capped Au15nanoclusters into mono-, few-, and multilayered sheets in colloidal solution. Both the experimental results and computer simulation reveal that the 2D self-assembly is initiated by 1D dipolar attraction common in nanometer-sized objects. The dense 1D attachment of Au15leads to a redistribution of the surface ligands, thus generating asymmetric vdW attraction. The deliberate control of the coordination of dipolar and vdW attraction further allows to manipulate the thickness and morphologies of 2D self-assembly architectures.