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表面巯基化修饰的磁性Fe_3O_4纳米粒子合成与表征 被引量:9

Preparation and Characterization of Surface Thiolated Magnetite Nanoparticles
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摘要 通过化学共沉淀法制备了粒径约30nm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64emu/g变为62emu/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。 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.
出处 《精细化工中间体》 CAS 2007年第2期63-67,共5页 Fine Chemical Intermediates
基金 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)。
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 magnetite nanoparticles coprecipitation thiolation surface modification bio-sensing
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