星形金纳米粒子制备及催化PNTP偶联反应的表面增强拉曼光谱研究

Surface Enhanced Raman Spectroscopic Studies on Coupling Reaction of PNTP at Pentagonal Gold Nanoparticles

发展有一种快速制备金星型纳米粒子的一锅法技术。研究表明采用三氯化锑及聚乙烯吡咯烷酮(PVP)为还原剂和表面活性剂制备得到金纳米五角星具有高度的对称性并呈现出完美的五角星形结构,其尺寸约为25 nm。其为五重孪晶结构,由晶面为{110}的五个相同亚结构通过[111]平面束缚在一起组成。与球形金纳米粒子相比,五角星形金纳米粒子SPR催化对硝基苯硫酚(PNTP)偶联反应具有更高活性,并且通过有限单元法(FEM)计算出热点分布以及使得电场增强最佳的接触方式。

A facile approach for fabrication of Au nanostar particle in one-pot has been developed successfully.The results demonstrated that the SbCl3 and polyvinylpyrrolidone(PVP)were served as the reductant and surfactant simultaneously for preparing the 12-hedral Au nanostars(Au NSs)with mean size of about 25 nm.The Au NSs exhibited high symmetry with main crystallographic plane of{110}facets.By comparing to spherical Au nanoparticles,the Au NSs with unique structure significantly improved the surface plasma resonance(SPR)catalytic coupling efficiency of p-nitrothiophenol(PNTP)to p,p’-dimercaptoazobenzene(DMAB).Through the calculation of four contact models electric-field distribution between two Au NSs by finite element method(FEM),the tip to tip contact model contributed electromagnetic field enhancement dominantly,which was associated with the high catalysis activity and SERS effect.