Immobilizing Au Nanoparticles with Polymer Single Crystals, Patterning and Asymmetric Functionalization

Considerable attention has been paid to nanoparticle (NP) research due to their fascinating properties and potential applications in nanotechnology and biotechnology. Asymmetrically functionalizing NPs is of particular interest since it could directly lead to controlled patterning of NPs into complex structures for a variety of applications. In this communication, we report, for the first time, using two-dimensional polymer lamellar single crystals as the solid substrate to create a patterned functional (thiol) surface and to immobilize AuNPs. We demonstrated that patterning of AuNPs could be achieved, and the AuNP area density could be easily controlled by polymer molecular weight. Furthermore, this unique technique also enables asymmetric functionalization of AuNPs. Bilayer AuNPs/polymer hybrids were obtained. Dissolving PEO single crystals led to free asymmetric binary AuNP complexes. This approach provides a novel means to pattern AuNPs and to synthesize asymmetrically functionalized AuNPs. We also anticipate that this methodology could be applied to other metallic or semiconducting NPs.