Fabrication and characteristics of spindle Fe_2O_3@Au core/shell particles  

作　　者：沈红霞 姚建林 顾仁敖 

机构地区：[1]College of Chemistry, Chemical Engineering and Materials Science, Suzhou University [2]Department of Biology and Chemical Engineering, Jiaxing University

出　　处：《中国有色金属学会会刊：英文版》2009年第3期652-656,共5页Transactions of Nonferrous Metals Society of China

基　　金：Projects(20573076, 20503019, 20773091) supported by the National Natural Science Foundation of China;Project(BK2005032) supported by the Natural Science Foundation of Jiangsu Province, China;Project(20050285019) supported by the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP), China

摘　　要：The fabrication and characteristics of spindle Fe2O3@Au core/shell particle were investigated, and the effect of the core/shell nanoparticles as the surface enhanced Raman spectroscopy (SERS)-active substrates was studied. By using the seed-catalyzed reduction technique, anisotropic Fe2O3@Au core/shell particles with spindle morphology were successfully prepared. The Fe2O3 particles with spindle morphology were initially prepared as original cores. The Au nanoparticles of 2 nm were attached onto the Fe2O3 particles through organosilane molecules. Uniform Au shell formed onto Fe2O3 core modified by Au nanoparticles through the in-situ reduction of HAuCl4. The shell thickness was controlled through regulating the concentration of HAuCl4 solution. The results of TEM, XRD and UV-vis characterization show that the core/shell particles with the original shape of the Fe2O3 particles are obtained and these surfaces are covered by Au shell completely. The surface enhanced Raman spectrum of the probe molecules adsorbed on these core/shell substrates is strong and the intensity is enhanced with the increase of the thickness of Au shell or the aspect ratio of particles. The spindle Fe2O3@Au core/shell particles exhibit optimum (SERS) activity.The fabrication and characteristics of spindle Fe2O3@Au core/shell particle were investigated, and the effect of the core/shell nanopartieles as the surface enhanced Raman spectroscopy （SERS）-active substrates was studied. By using the seed-catalyzed reduction technique, anisotropic Fe2O3@Au core/shell particles with spindle morphology were successfully prepared. The Fe2O3 particles with spindle morphology were initially prepared as original cores. The Au nanopartieles of 2 nm were attached onto the Fe2O3 particles through organosilane molecules. Uniform Au shell formed onto Fe2O3 core modified by Au nanoparticles through the in-situ reduction of HAuCl4. The shell thickness was controlled through regulating the concentration of HAuCl4 solution. The results of TEM, XRD and UV-vis characterization show that the core/shell particles with the original shape of the Fe2O3 particles are obtained and these surfaces are covered by Au shell completely. The surface enhanced Raman spectrum of the probe molecules adsorbed on these core/shell substrates is strong and the intensity is enhanced with the increase of the thickness of Au shell or the aspect ratio of panicles. The spindle Fe2O3@Au core/shell particles exhibit optimum （SERS） activity.

关 键 词：金纳米粒子 颗粒形态 氧化铁 主轴 表面增强拉曼光谱 FE2O3 特性 制备 

分 类 号：TB302[一般工业技术—材料科学与工程]