Fe3O4/Au composite nano-particles and their optical properties  

作　　者：CUI Yali HUI Wenli SU Jing WANG Yani CHEN Chao 

机构地区：[1]Biochip Research and Development Center,Northwest University,National Engineering Research Center for Miniaturized Detection System,Xi'an 710069,China Biochip Research and Development Center,Northwest University,National Engineering Research Center for Miniaturized Detection System,Xi'an 710069,China Biochip Research and Development Center,Northwest University,National Engineering Research Center for Miniaturized Detection System,Xi'an 710069,China Biochip Research and Development Center,Northwest University,National Engineering Research Center for Miniaturized Detection System,Xi'an 710069,China Biochip Research and Development Center,Northwest University,National Engineering Research Center for Miniaturized Detection System,Xi'an 710069,China

出　　处：《Science China Chemistry》2005年第4期273-278,共6页中国科学（化学英文版）

基　　金：the National Natural Science Foundation of China(Grant No.20273050); the Nat ional High Technology Research and Development Program of China(Grant Nos.2002AA2Z2031&2003AA2Z2080).

摘　　要：Fe3O4/Au composite particles with core/shell structure were prepared by reduction of Au3+ with hydroxylamine in the presence of an excess of Fe3O4 as seeds.The resultant col-loids,with an average diameter of less than 100 nm,were obtained;the remaining non-reacted Fe3O4 seeds can be removed by treatment with diluted HCl solution.The Fe3O4/Au colloids ex-hibit a characteristic peak of UV-visible spectra,which largely depend on the size of the particle and the suspension medium.The localized surface plasmon resonance peaks red shift and broaden with increased nanoparticle diameter or increased solvent ionic strength.The optical property is very important in the establishment of means for the detection of biomolecules.Fe3O4/Au composite particles with core/shell structure were prepared by reduction of Au3+ with hydroxylamine in the presence of an excess of Fe3O4 as seeds.The resultant col-loids,with an average diameter of less than 100 nm,were obtained;the remaining non-reacted Fe3O4 seeds can be removed by treatment with diluted HCl solution.The Fe3O4/Au colloids ex-hibit a characteristic peak of UV-visible spectra,which largely depend on the size of the particle and the suspension medium.The localized surface plasmon resonance peaks red shift and broaden with increased nanoparticle diameter or increased solvent ionic strength.The optical property is very important in the establishment of means for the detection of biomolecules.

关 键 词：Fe3O4/Au  nanoparticles  core/shell  structure  optical  property. 

分 类 号：N[自然科学总论]