writer：Wang, Shengnan; Zhang, Minchao; Zhang, Wangqing
keywords：Mesoporous Silica Microspheres
source：期刊
specific source：ACS CATALYSIS
Issue time：2011年

pubs.acs.org/doi/abs/10.1021/cs1000762

Synthesis and catalysis of yolk-microspheres containing single Au nanoparticle core and a mesopurous shell of hallow mesoporous silica microspheres (HMSM)are reported. This synthesis employs polystyrene-co-poly(4-vinylpyridne) micorsphereses both template to fabricate the HMSM shell through sol-gel process and scalffold to immobilize the Au nanoparticle. Since the single Au nanoparticle cor is supernatant within the inert HMSM shell, the yolk-shell catalyst has minimum support effect and is a promising model to explore the origin of Au catalysis. Catalyzed reduction of 4-nitorphenol with NaBH(4) demonstrates size dependent induction or activation and size dependent activity of the Au nanoparticle of the yolk-shell catalyst.