铁氧化物/金磁性核壳纳米粒子的制备及其富集与SERS研究  

Preparation of Magnetic Fe Oxide Core/Au Shell Nanoparticles and Their Surface-enhanced Raman Spectroscopy

作　　者：鲍芳[1] 姚建林[1] 顾仁敖[1] 

机构地区：[1]苏州大学化学系,苏州215006

出　　处：《高等学校化学学报》2008年第8期1552-1554,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20373046;20573076);高等学校博士学科点专项科研基金(批准号:20050285019);江苏省自然科学基金(批准号:BK2005032);厦门大学固体表面物理化学国家重点实验室开放课题基金资助

摘　　要：Fe oxide core/Au shell nanoparticles were prepared by the reduction of Au3+ onto the surfaces of Fe oxide nanoparticles and characterized by scanning electron microscopy(SEM). The results reveal that the prepared core/shell nanoparticles were covered by Au shell and the surfaces of the core/shell particles are jagged after the initial addition of Au3+. Surface enhanced Raman scattering(SERS) activities of these magnetic nanoparticles were studied by using pyridine(Py) as a probe molecule after a magnet was used to concentrate the colloid. It was found that the SERS intensity depends on the Au shell thickness of the core/shell nanoparticles and strengthens with the increasing shell thickness. The detection limit for Py can be very low when the magnetic Fe oxide core/Au shell nanoparticles were used and even down to 10-7 mol/L.Fe oxide core/Au shell nanoparticles were prepared by the reduction of Au^3 ＋ onto the surfaces of Fe oxide nanoparticles and characterized by scanning electron microscopy（SEM）. The results reveal that the prepared core/shell nanoparticles were covered by Au shell and the surfaces of the core/shell particles are jagged after the initial addition of Au^3＋. Surface enhanced Raman scattering（SERS） activities of these magnetic nanoparticles were studied by using pyridine（Py） as a probe molecule after a magnet was used to concentrate the colloid. It was found that the SERS intensity depends on the Au shell thickness of the core/shell nanoparticles and strengthens with the increasing shell thickness. The detection limit for Py can be very low when the magnetic Fe oxide core/Au shell nanoparticles were used and even down to 10^-7 mol/L.

关 键 词：磁性核壳纳米粒子 表面增强拉曼光谱 铁氧化物/金 

分 类 号：O657.37[理学—分析化学]