Au/Fe_3O_4磁性复合粒子的光化学制备  

Photochemical preparation of Au/Fe_3O_4 composites

作　　者：宫培军[1] 赵素芳[2] 洪军[2] 姚思德[2] 余家会[3] 李良超[1] 

机构地区：[1]浙江师范大学化学与生命科学学院物理化学研究所,金华321004 [2]中国科学院上海应用物理研究所,上海201800 [3]华东师范大学新药创制先进技术研究院,上海200062

出　　处：《辐射研究与辐射工艺学报》2008年第2期108-111,共4页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(20504010);上海市科委纳米专项(0452nm068;0652nm009)资助

摘　　要：用紫外光辐照含有纳米Fe3O4磁流体的氯金酸和聚乙烯醇的水溶液,制备了Au/Fe3O4磁性复合粒子,并用紫外-可见光谱、X射线衍射和透射电镜对其进行了表征。磁性复合粒子中Au纳米粒子具有面心立方结构,其等离子共振吸收峰分布较窄,说明金纳米粒子的粒径分布较均匀。TEM表明该复合粒子具有团簇状结构,由许多Au和Fe3O纳米粒子构成,尺寸介于70～230nm范围。对照实验表明聚乙烯醇是Au纳米粒子与Fe3O4之间复合的必需媒介,据此提出了生成团簇状Au/Fe3O4磁性复合粒子的可能机制。Au/Fe3O4 composites were formed by irradiating the aqueous solution of HAuCl4 containing poly（vinyl alcohol） （PVA） with UV light at a wavelength λ=254 nm in the presence of FesO4 nanoparticles. The properties of the as-prepared composites were characterized by means of ultraviolet spectra （UV-vis）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）, respectively. XRD pattern confirmed the face-centered cubic phase of Au nanoparticles in the composites. The surface plasmon resonance band of the sample was rather narrow, which indicated a relatively narrow size distribution of Au nanoparticles. TEM revealed that Au/Fe3O4 composites with a size range of 70 ～ 230 nm had cluster structure, composed of a number of Au and Fe3O4 nanoparticles. Furthermore, it turned out that PVA was necessary for constructing the composites. A possible mechanism was proposed for the formation of Au/Fe3O4 composites.

关 键 词：金磁复合粒子 紫外辐照 团簇结构 聚乙烯醇 

分 类 号：O644.1[理学—物理化学] O631.3[理学—化学]