Au(Ru)-SiO_2纳米-微米复合粒子的制备及精细结构研究  

Preparation and Fine Structures of Au(Ru)-SiO-2 Micro/nano-composite particles

作　　者：马希骋[1] 蔡元华[2] 伦宁[2] 温树林[2] 豆帆 

机构地区：[1]山东大学化学化工学院 [2]山东大学材料科学与工程学院材料表征分析中心,山东济南250061 [3]山东省纳米涂层工程技术中心,山东烟台265500

出　　处：《材料科学与工程学报》2003年第6期793-797,共5页Journal of Materials Science and Engineering

摘　　要：在制备出高性能的Au(Ru) SiO2 纳米 微米复合粒子的基础上 ,使用高分辨透射电镜、电子探针和X 射线衍射等现代手段 ,研究了该复合粒子的精细结构。研究结果表明 :所制备的纳米 微米复合粒子在结构上呈现类似天体星云式的多层次结构 ,可区分为三级 ,其中一级结构是在微米尺度上 ,该层次上的SiO2 微粒是整个复合粒子的承载骨架 ,其粒度均匀 ,分散性好 ,这在一定程度上大大降低了其所包含的功能金、钌纳米粒子的团聚问题 ;二级结构是在纳米尺度上 ,观察发现 ,金、钌纳米粒子相对均匀地镶嵌在第一结构层次的SiO2 微粒中 ,它们是整个材料的性能载体 ,对材料性能起决定作用 ,研究指出进一步适度降低第一层次的SiO2 微粒的粒径有望进一步降低甚至消除其中金、钌纳米粒子间的团聚 ;三级结构为金、钌纳米晶粒的高分辨晶格像 ,表明纳米晶表面原子点阵存在畸变。研究还指出 ,在该纳米 微米复合粒子中 ,金属金、钌的纳米粒子是以机械混合形式存在 ,不形成合金 。In this parer,Au(Ru)-SiO-2 micro/nano-particles were prepared by using sol-gel method.High resolution electron microscope(HRTEM),electron microprobe(EMP) and X-ray diffraction (XRD) were used to investigate their microstructures.Experimental results show that the material has a microstructure like nebulae,which involve three levels.The first level is in micro-scale observed by EMP showing that SiO-2 microparticles are the matrix of the functional Au and Ru nanoparticles.Au and Ru nanoparticles dispersed very well in SiO-2 matrix with a rather even diameter contribution,which was considered to be very important to solve the aggregation of the Au/Ru nanoparticles.The second level is in nano-scale observed by HRTEM indicating that Au/Ru nanopaticles were embodied relative evenly in the SiO-2 matrix with only slightly aggregation.Further decreasing the diameter of the SiO-2 microparticles matrix is expected to further inducing the aggregation of Au/Ru nanoparticles.The third level is in atomic scale indicating the atomic lattice of Au/Ru nanoparticles,showing that the lattice spacings in surface are different from the interplanar spacings.Moreover,Au and Ru nanoparticles were observed to be separately distributed in SiO-2 matrix,no alloy particles of Au and Ru were found.

关 键 词：Au(Ru)-SiO2纳米-微米复合粒子 精细结构 金 钌 

分 类 号：TB383[一般工业技术—材料科学与工程]