A cationic block copolymer of poly(1-vinyl-3-ethylimidazolium bromide)and poly(N-isopropylacrylamide),abbreviated as PVEIM-b-PNIPAM,is used as a thermo-switch and a stabilizer to fabricate a novel thermo-sensitive gra...A cationic block copolymer of poly(1-vinyl-3-ethylimidazolium bromide)and poly(N-isopropylacrylamide),abbreviated as PVEIM-b-PNIPAM,is used as a thermo-switch and a stabilizer to fabricate a novel thermo-sensitive graphene–gold nanocomposite via electrostatic interactions,one-pot in situ growth,and chemical reduction.The morphology,chemical structure,and thermosensitivity of the nanocomposite are systematically characterized,which manifests that the PVEIM-b-PNIPAM stabilizer leads to uniformly distributed gold nanoparticles(GNPs)on the surface of reduced graphene oxide(RGO).The new nanocomposite has good dispersibility and high catalytic activity for the reduction of 4-nitrophenol.In addition,the phase transition of this nanocomposite can be reversibly modulated by temperature in water,which results in significantly different catalytic activities depending on the temperature.This thermo-sensitive nanocomposite may be applied as a thermo-switch material for heterogeneous catalysis,sensors,smart material devices etc.展开更多
基金supported by the research funds from the National Natural Science Foundation of China(21606081).
文摘A cationic block copolymer of poly(1-vinyl-3-ethylimidazolium bromide)and poly(N-isopropylacrylamide),abbreviated as PVEIM-b-PNIPAM,is used as a thermo-switch and a stabilizer to fabricate a novel thermo-sensitive graphene–gold nanocomposite via electrostatic interactions,one-pot in situ growth,and chemical reduction.The morphology,chemical structure,and thermosensitivity of the nanocomposite are systematically characterized,which manifests that the PVEIM-b-PNIPAM stabilizer leads to uniformly distributed gold nanoparticles(GNPs)on the surface of reduced graphene oxide(RGO).The new nanocomposite has good dispersibility and high catalytic activity for the reduction of 4-nitrophenol.In addition,the phase transition of this nanocomposite can be reversibly modulated by temperature in water,which results in significantly different catalytic activities depending on the temperature.This thermo-sensitive nanocomposite may be applied as a thermo-switch material for heterogeneous catalysis,sensors,smart material devices etc.
