基于CoFe2O4纳米晶的磁性-发光核壳纳米结构的制备及其穆斯堡尔谱学研究

项目名称： 基于CoFe2O4纳米晶的磁性-发光核壳纳米结构的制备及其穆斯堡尔谱学研究

项目编号： No.11504132

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 王丽

作者单位： 吉林师范大学

项目金额： 23万元

中文摘要： 本项目将利用TiO2、ZnO和SiO2为界面层，改变磁性CoFe2O4纳米粒子核与荧光半导体量子点壳层之间的电子耦合，研究界面层和量子点层对CoFe2O4纳米粒子磁性的影响，改善材料结晶质量和控制电荷传输以及稳定性，获得具有优良磁、光性能的复合纳米结构。首先在粒径为(3-10 nm) CoFe2O4粒子表面包覆TiO2 (或ZnO、SiO2)壳层，研究界面层对其结构形貌和磁性的影响和调控机理；再在强磁性粒子表面包覆CuInS2和Mn、Cu掺杂ZnS、ZnSe、ZnInS等量子点发光层，研究量子点尺寸、结构和发光层厚度对复合纳米结构磁性的影响；同时研究磁性粒子和界面势垒层及其能级结构对其发光性质的影响，了解CoFe2O4粒子与发光量子点层之间的电荷转移过程。通过对以上问题的研究，实现对磁光复合纳米结构性能的改善，对其在磁共振及光学成像中的应用具有重要的科学意义。

中文关键词： CoFe2O4/量子点；核壳纳米结构；磁性；发光；穆斯堡尔谱学

英文摘要： In this project the shells of TiO2, ZnO and SiO2 are used to coat CoFe2O4 nanoparticles to change the electronic coupling between CoFe2O nanoparticles as the core and luminescent quantum dots as the shell, improve the crystalline quality of the materials, control charge transport and stability and obtain high performance magnetic nanocomposites. The research works includes the following respects: 1) the preparation of CoFe2O4 nanoparticles coated with shell TiO2 (or ZnO, SiO2) and study on the effect of the shells on the morphology and magnetic properties of CoFe2O nanoparticles. 2) the growth of highly efficient luminescent quantum dots such as CuInS2 and Mn (Cu) doped nanocrystals of ZnS, ZnSe and ZnInS on the surface of the CoFe2O4/semiconductor shell nanoparticles and study of the size and structure of the quantum dots and the thicknesses of emissive layers on the magnetic properties of the nanostructures. 3) It also includes the study of magnetic particles, interface semiconductor layer barriers, and their energy level alignment on the luminescent properties of the nanocomposites, the understanding of the charge transport between the magnetic nanoparticles and luminescent quantum dots. The study on these questions above is very important for us to further optimize these nanostructures of magnetic and luminescent core/shell nanostructures and improve their performances for applications of magnetic resonance and optical imaging.

英文关键词： CoFe2O4/quantum dots; core/shell nanostructures;magnetic property;luminescence;Mössbauer spectroscopy