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Solvent-Mediated Self-Assembly of Nanocube Superlattices

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posted on 29.01.2014, 00:00 by Zewei Quan, Hongwu Xu, Chenyu Wang, Xiaodong Wen, Yuxuan Wang, Jinlong Zhu, Ruipeng Li, Chris J. Sheehan, Zhongwu Wang, Detlef-M. Smilgies, Zhiping Luo, Jiye Fang
Self-organization of colloidal Pt nanocubes into two types of distinct ordered superlattices, simple-cubic and body-centered-tetragonal structures, has been achieved using a home-built setup. Detailed translational and orientational characteristics of these superstructures were determined using a transmission electron microscopy tomographic technique with 3D reconstruction analysis. The formation of these distinct superlattices is the result of a delicate choice of solvent (i.e., aliphatic hexane or aromatic toluene hydrocarbons), which serves as a dispersion medium to fine-tune the relative strengths of ligand–ligand and ligand–solvent interactions during the self-assembly process. This work provides important insights into the effects of ligand–solvent interactions on superlattice formation from nonspherical nanoparticles.