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Fabrication of Hierarchical Fe 3 O 4 @SiO 2 @P(4VP‐DVB)@Au Nanostructures and Their Enhanced Catalytic Properties
Author(s) -
Guo Wanchun,
Wang Qian,
Luan Yi,
Wang Ge,
Dong Wenjun,
Yu Jie
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201403251
Subject(s) - catalysis , nanocrystal , materials science , nanostructure , colloidal gold , fabrication , chemical engineering , nanotechnology , nanoparticle , chemistry , organic chemistry , medicine , alternative medicine , pathology , engineering
Hierarchical Fe 3 O 4 @SiO 2 @P(4VP‐DVB)@Au nanostructures were prepared in which the slightly cross‐linked, thin poly(4‐vinylpyridine‐ co ‐divinylbenzene) (P(4VP‐DVB)) shells were constructed onto Fe 3 O 4 @SiO 2 nanospheres, followed by in situ embedding of gold nanocrystals homogeneously into the P4VP chains. These slightly cross‐linked chains, easily swollen by the reactants, make the gold nanocrystals accessible to the reactants, and the thin shell (about 15 nm) reduces the diffusion distance of the reactants to the active gold nanocrystals (about 5 nm), thereby enhancing their catalytic activity and utility. At the same time, confinement of gold nanocrystals within the P4VP shells prevents their migration and coagulation during catalytic transformations. Hence the nanocomposites exhibit high activity (up to 4369.5 h −1 of turnover frequency (TOF)) and controllable magnetic recyclability without any significant loss of gold species after ten runs of catalysis in the reduction of 4‐nitrophenol.