负载小粒径Au纳米粒子SiO_2亚微球的制备
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摘要
Au纳米粒子(AuNPs),特别是小粒径(～1 nm)AuNPs的粒径、形貌和表面状态对其催化性能有着重要影响。本文介绍了以小粒径Ag纳米粒子(<5 nm)为牺牲剂,通过金属置换反应,在SiO_2亚微球上生长表面裸露的小粒径AuNPs。由于Au NPs表面完全暴露该材料在氧化还原催化方面具有广阔的应用前景。
The particle size,morphology and surface state of Au nanoparticles(AuNPs),especially small(～1 nm nm)AuNPs,had important effects on their catalytic performance.In this paper,small size AgNPs(<5 nm)were used as sacrificial agent to deposit surface-exposed fine AuNPs(～1 nm)on SiO_2 sub-microspheres by metal substitution reaction.This material had broad application prospects in redox catalysis.
The particle size,morphology and surface state of Au nanoparticles(AuNPs),especially small(～1 nm nm)AuNPs,had important effects on their catalytic performance.In this paper,small size AgNPs(<5 nm)were used as sacrificial agent to deposit surface-exposed fine AuNPs(～1 nm)on SiO_2 sub-microspheres by metal substitution reaction.This material had broad application prospects in redox catalysis.
引文
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[2]Wang C,Ciganda R,Salmon L,et al.Highly efficient transition metal nanoparticle catalysts in aqueous solutions[J].Angew Chem,2016,55,3091–3095.
[3]Fang J,Li J,Zhang B,et al.The support effect on the size and catalytic activity of thiolated Au25 nanoclusters as precatalysts[J].Nanoscale,2015,7(14):6325-6333.
[4]Liu X,He L,Liu Y,et al.Supported gold catalysis:from small molecule activation to green chemical synthesis[J].Acc Chem Res,2014,47(3):793-804.
[5]Zhang J,Chen G,Guay D,et al.Highly active PtAu alloy nanoparticle catalysts for the reduction of 4-nitrophenol[J].Nanoscale,2014,6(4):2125-2130.
[6]Li G,Jin R.Atomically precise gold nanoclusters as new model catalysts[J].Acc Chem Res,2013,46(8):1749-1758.
[7]Chiu C,Li Y,Ruan L,et al.Platinum nanocrystals selectively shaped using facet-specific peptide sequences[J].Nat Chem,2011,3(5):393–399.
[8]Azubel M,Kornberg R D.Synthesis of water-soluble,thiolate-protected gold nanoparticles uniform in size[J].Nano Lett,2016,16(5):3348-3351.
[9]Liu B,Wang P,Lopes A,et al.Au–carbon electronic interaction mediated selective oxidation of styrene[J].Acs Catal,2017,7(5),3483-3488.
[10]Liu J,Wang F,Xu T,et al.Styrene epoxidation over carbon nanotube-supported gold catalysts[J].Catal Lett,2010,134(1-2):51-55.
[11]Linares N,Canlas C P,Garcia-Martinez J,et al.Colloidal gold immobilized on mesoporous silica as a highly active and selective catalyst for styrene epoxidation with H2O2[J].Catal Commun,2014,44(44):50-53.
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[13]李连中,卓尚军,申如香,等.XPS-AES联用技术对Pt-Co,Cu-Au和Cu-Ag合金薄膜的定量[J].光谱学与光谱分析,2013,33(11):3128-3132.