CAREER: Synthesis and Structure-Property Elucidation of III-V Based Magnetic Semiconductor Nanoparticles

职业：III-V族磁性半导体纳米颗粒的合成和结构性能阐明

• 批准号: 0094273
• 负责人: Stephanie Brock
• 金额: $ 44.82万
• 依托单位: Wayne State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-01 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0094273&HistoricalAwards=false
• 关键词: CAREER; Synthesis; Structure; Property; Elucidation

The aim of this project is to investigate the synthesis and physical property characterization of nanoparticles with coupled magnetic and electronic properties. Two types of systems will be studied, both based on III-V semiconductors: (1) Diluted magnetic semiconductors (DMS's) and (2) Heterostructured core-shell nanoparticles with a magnetic:semiconducting interface. Such materials are expected to combine the information storage ability of magnetic devices, with the processing ability of semiconductor devices. The miniaturization of circuits is expected to provide an economic impetus for such dual use devices. III-V based nanoparticle DMS's will be prepared through modified co-precipitation reactions of manganese and iron salts with indium or gallium in the presence of a pnictogen source such as phosphorous or arsenic. These materials will be characterized using standard techniques for structural and particle size determination of nanoparticles and the physical properties will be evaluated by magnetic susceptibility, absorption/luminescence spectroscopy, and coupled magnetic/optical techniques. The structural and physical properties of DMS nanoparticles will be compared to heterostructured nanoparticles consisting of a magnetic transition metal pnictide core and a semiconducting main group pnictide shell. Techniques have been developed for producing transition metal pnictide nanoparticles (cores) and to be used as substrates for the nucleation/precipitation of indium or gallium pnictide phases (shells). %%%The diluted and heterostructured magnetic semiconductor materials prepared in the course of this research are expected to impact industries focused on information storage/transmission and development of magnetoresistive sensors. Accordingly, an important educational goal is to illustrate the relevance of materials research to technological advances by fostering interactions between students and local industry. Additionally, modules emphasizing materials chemistry and nanotechnology will be incorporated into traditional inorganic courses at the graduate and undergraduate levels.

本项目的目的是研究具有磁性和电子耦合性质的纳米粒子的合成和物理性质表征。将研究两种基于III-V型半导体的系统：(1)稀释磁性半导体（DMS）和(2)具有磁性半导体界面的异质结构核壳纳米颗粒。这种材料有望将磁性器件的信息存储能力与半导体器件的处理能力结合起来。电路的小型化有望为这种双重用途设备提供经济动力。III-V基纳米颗粒DMS将通过锰和铁盐与铟或镓在磷或砷等光源存在下的改性共沉淀反应来制备。这些材料将使用纳米颗粒结构和粒径测定的标准技术进行表征，物理性质将通过磁化率、吸收/发光光谱和耦合磁/光学技术进行评估。DMS纳米粒子的结构和物理性质将与由磁性过渡金属pnictide核和半导体主基团pnictide壳组成的异质结构纳米粒子进行比较。已经开发出了生产过渡金属pnictide纳米颗粒（核）的技术，并将其用作铟或镓pnictide相（壳）成核/沉淀的底物。在本研究过程中制备的稀释和异质磁性半导体材料预计将影响以信息存储/传输和磁阻传感器开发为重点的行业。因此，一个重要的教育目标是通过促进学生和当地工业之间的互动来说明材料研究与技术进步的相关性。此外，强调材料化学和纳米技术的模块将被纳入研究生和本科生的传统无机课程中。