Journal
ACS NANO
Volume 9, Issue 6, Pages 6315-6323Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01823
Keywords
two-dimensional material; self-assembly; nanocluster; nanosheet; anisotropic vdW attraction
Categories
Funding
- 973 Program of China [2014CB643503]
- NSFC [51425303, 21374042, 21174051, 91123031, 51433003, 21221063, 51403022]
- Natural Science Foundation of Jilin Province [20140101048JC]
- MOST of China
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Two-dimensional (2D) nanonnaterials 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 Au-15 nanoclusters 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 Au-15 leads 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.
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