第 37 卷第 2 期Vol. 37 No. 2
2007 年 4 月Apr 2007

所属栏目:功能材料

表面巯基化修饰的磁性Fe3O4纳米粒子合成与表征
贺全国,吴 伟,杨 云,张继德,王吉清 (湖南工业大学 绿色包装与生物纳米技术应用实验室,湖南 株洲 412008)
摘 要:通过化学共沉淀法制备了粒径约30 nm的磁性四氧化三铁(Fe3O4)纳米粒子,并采用3-巯丙基三乙氧基硅烷(MPTES)将Fe3O4纳米粒子表面修饰上巯基(-SH)官能团,获得了表面巯基化的磁性Fe3O4纳米粒子。利用X-射线粉末衍射仪(XRD),透射电子显微镜(TEM),带有能谱仪(EDS)的扫描电子显微镜(SEM),光电子能谱仪(XPS),以及磁学测量系统(MPMS)对粒子的结构和性能进行了表征和分析。结果表明:表面巯基化后的磁性粒子粒径略有增加,室温下磁化强度由原来的64 emu/g变为62 emu/g,较好地保留了原始磁性特征。研究结果对巯基化磁性纳米粒子实现生物分子结合、固定负载乃至生物传感的应用具有重要意义。
关键词:磁性Fe3O4纳米粒子;共沉淀法;巯基化;表面修饰;生物传感
Preparation and Characterization of Surface Thiolated Magnetite Nanoparticles
HE Quan-guo,WU Wei,YANG Yun,ZHANG Ji-de,WANG Ji-qing (Green Packaging and Biological Nanotechnology Laboratory,Hunan University of Technology,Zhuzhou 412008,China)
Abstract:Magnetic Fe3O4 nanoparticles around 30 nm were prepared using modified chemical co-precipitation,and corresponding thiolated magnetite nanoparticles are also obtained via surface mercaptopropyltriethoxysilane(MPTES) modification. The properties and structure of particles were characterized by X-Ray powder diffraction(XRD),scanning electron microscopy(SEM) with the energy dispersive spectroscopy(EDS),the zetasizer nanoinstrument,X-Ray photoelectron spectroscopy(XPS)and magnetic property measurement system(MPMS)with superconducting quantum interference device(SQUID)magnetometry. The result reveals that the magnetic particles have a slight dimensional increase in average diameter,and retain almost original saturation magnetization from 64 emu/g to 62 emu/g after surface thiolation. The finding is of practical significance for magnetic nanoparticle applications associated with bioconjugation,target carriers and bio-sensing.
Key words:magnetite nanoparticles;coprecipitation;thiolation;surface modification;bio-sensing
基金项目: 国家自然科学基金青年基金资助项目(20505020),中国包装总公司科研项目资助(04ZBKJA004),湖南省教育厅资助科研项目资助(05C508),湖南省普通高校青年骨干教师资助计划资助(2005-2008)。
作者简介:贺全国(1973- ),男,湖南常德人,副教授,博士,硕士生导师,主要从事功能纳米材料、生物传感技术与器件方面研究。 (E-mail:hequanguo@163.com)
收稿日期:2007-01-22
阅读全文