聚合物微球负载金、铂和铑纳米粒子的制备

Preparation of polymer microspheres supported Au,Pt and Rh nanoparticles

通过蒸馏沉淀聚合法制备表面带不同官能基团的单分散Poly(DVB-co-AA),Poly(EGDMA-co-VPy),Poly(EGDMA-co-HEMA)-SH聚合物微球,并以这些聚合物为载体,通过原位还原高价金属盐前体,制备了一系列不同粒径的单分散贵金属Au、Pt和Rh纳米粒子.通过X射线光电子表面能谱(XPS)研究了聚合物载体与金属纳米粒子的相互作用,同时还分析了相互作用与粒径之间的关系.结果表明:不同官能团与金属纳米粒子间因得失电子产生相互作用,使得金属纳米粒子稳定于聚合物表面.对于同种金属,与聚合物载体的相互作用越强,粒径越小;对于同种聚合物载体,贵金属的电负性越强,粒径越大.

Narrow-dispersed Au, Pb and Rh nanoparticles with different size were prepared by in situ reduction of themetallic precursor, with monodispersed Poly（DVB-co-AA）, Poly（EGDMA-co-VPy） and Poly（EGDMA-co-HEMA）-SH microspheres as supported. The interaction of the functional groups of the polymers and noble metalswere investigated by X-ray Photoelectron Spectroscopy （XPS）. The size and morphology of the retained metallicnanoparticles were determined by TEM, which show high distribution on the polymer supporters and narrowdispersednanoparticles. The size were dependent on the sort of the functional groups of the polymer microspheres,in another word, the interaction of the polymers with metal atoms. The result showed that the interaction of gainingand losing electrons between different functional groups with metal nanoparticles, making the metal nanoparticlessupported on the polymer surface. With respect of the same metal, the stronger the interaction, the bigger thediameter of the nanoparticles; with respect of the same polymer supporter, the larger the electronegativity of thenoble metals, the bigger the size of the nanoparticles.