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A Self‐Assembly Process for the Immobilization of N‐Modified Au Nanoparticles in Ordered Mesoporous Carbon with Large Pores
Author(s) -
Li Hui,
Shen Hong,
Pei Chun,
Chen Shangjun,
Wan Ying
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900626
Subject(s) - materials science , colloidal gold , mesoporous material , nanoparticle , self assembly , chemical engineering , copolymer , nanomaterial based catalyst , x ray photoelectron spectroscopy , catalysis , polystyrene , carbon fibers , nanotechnology , polymer , organic chemistry , chemistry , composite number , composite material , engineering
A self‐assembly approach has been developed for the immobilization of nitrogen‐modified gold nanoparticles in an ordered mesoporous carbon matrix with large pores. Self‐assembly of the polystyrene‐block‐poly(4‐vinylpyridine) (PS‐ b ‐P4VP) diblock copolymer template coordinated with gold ions and a low‐polymerized phenolic resin leads to a face‐centered cubic mesostructure with F 3 - mm symmetry. Characterization with X‐ray photoelectron spectroscopy and transmission electron microscopy shows that after pyrolysis at 600 °C, monodispersed N‐modified gold nanoparticles approximately 4 nm in size are encapsulated in the ordered mesoporous carbon matrix with open and large pores. The aggregation of Au nanocatalysts into large particles is inhibited due to the coordination between gold and pyridine. The pore size can be tuned from 6 to 12 nm by changing the molecular weight of the PS block. The N‐modified gold catalyst is active in converting benzyl alcohol to benzoic acid using O 2 as a green oxidant.