Self-Assembly of Polymer-Coated Au Nanocrystals with Controlled Molecular Weight and Core Size
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초록
내용
Here, we present manipulation of polystyrene-coated Au NC (Au@PS) assembly structure by changing molecular weight (Mn) of PS and diameter of Au. Au@PS nanoparticles were prepared by simple ligand exchange with PS-SH. In this way, the interparticle distance was controlled from a few nm to more than 10 nm. The Au@PS particles were self-assembled using liquid-air interface assembly. TEM images and grazing incidence small-angle X-ray scattering measurements revealed highly ordered Au@PS particles in long range. In particular, we could control the self-assembly structure of Au@PS nanoparticles between fcc and bcc by simultaneously controlling the size of NCs and Mn of polymeric ligands. Finally, we reveal the fundamental reasons that determine the self-assembled structure by analyzing the soft shell to hard core ratio of various Au@PS nanoparticles. This work presents an approach to control the polymorphism of polymer-coated NCs, which benefits the fabrication of devices consisting of NCs.