title: Photochemical switching of the phase-transition temperatures of p-NIPAM-Pt nanoparticles thermosensitive polymer composites associated with electrodes: functional electrodes for switchable electrocatalysis.
abstract: The thermosensitive poly(N-isopropylacrylamide) (p-NIPAM) is electropolymerized onto Au surfaces. The incorporation of the photoisomerizable N-carboxyethyl nitrospiropyran compound into p-NIPAM allows the reversible photochemical control of the gel-to-solid phase-transition temperatures of the polymer. Whereas the gel-to-solid phase-transition temperature of the nitrospiropyran-modified p-NIPAM is 33±2 °C, the phase-transition temperature of the nitromerocyanine-functionalized p-NIPAM matrix corresponds to 38±1 °C. Upon the incorporation of Pt nanoparticles (NPs) into the photochemically controlled p-NIPAM, a hybrid photoswitchable electrocatalytic matrix is formed. At a fixed temperature corresponding to 38 °C, the effective electrocatalytic reduction of H(2)O(2), or the oxidation of ascorbic acid, proceeded in the presence of the nitromerocyanine-functionalized p-NIPAM, yet these electrocatalytic transformations were inhibited in the presence of the nitrospiropyran-modified p-NIPAM.
authors.affiliation: Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
authors.forename: Junji
authors.initials: J
authors.lastname: Zhang
authors.forename: Michael
authors.initials: M
authors.lastname: Riskin
authors.forename: Ran
authors.initials: R
authors.lastname: Tel-Vered
authors.forename: He
authors.initials: H
authors.lastname: Tian
authors.forename: Itamar
authors.initials: I
authors.lastname: Willner