Controlling Graphene Wrinkles using the Phase Transition of a Low Critical Solution Temperature Polymer
발표자
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초록
내용
A novel method for controlling reduced graphene oxide (rGO) wrinkles through a phase transition in a solution using a low critical solution temperature (LCST) polymer dispersant has been developed. The polymer dispersant is designed by control of architecture and composition using RAFT polymerization. Synthesized poly(2-(dimethylaminoethyl) methacrylate-block-styrene) (PDbS) can be successfully functionalized on the rGO surface via noncovalent functionalization. PDbS-functionalized rGO (PDbS–rGO) exhibits good dispersibility in an aqueous phase and forms wrinkles on the PDbS–rGO surface because of phase transition at the LCST behavior. The formation of PDbS–rGO wrinkles is controlled by varying the aggregation number of the polymer dispersant on the PDbS–rGO surface that depends on temperature. This is confirmed by TEM, SEM and Raman spectroscopy. Also, the mechanism of wrinkle control is proved by gold nanoparticles that are grown in polymer dispersant on the PDbS–rGO surface.