We demonstrate an electrochemical switching of conformation of surface-bound polymer brushes, by grafting
environmentally sensitive polymer brushes from an electrochemically-active conducting polymer (ECP). Using atom
transfer radical polymerization (ATRP), we grafted zwitterionic polymer brushes, poly(3-(methacryloylamino)propyl)-
dimethyl(3-sulfopropyl)ammonium hydroxide) (MPDSAH), from a surface initiated poly(pyrrole-co-pyrrolyl butyric
acid) film. The changes in ionic solution composition in electrical double layer at the surface resulting from oxidation
and reduction of the ECP trigger a switch in conformation of surface-bound poly(MPDSAH), demonstrated here by
electrochemical impedance spectroscopy (EIS). The switch is also dependent upon temperature. We speculate that the
synergistic combination of properties embodied in these "smart" materials may find application in electrochemical
control of surface wetting and of interaction with biomolecules and living cells.
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