Electron doping in magnetic semiconductors

磁性半导体中的电子掺杂

• 批准号: 1112387
• 负责人: YuYe Tong
• 金额: $ 37.5万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1112387&HistoricalAwards=false
• 关键词: Electron; doping; magnetic; semiconductors

In this proposal, Professor Stoll of Georgetown University will synthesize and characterize nanostructured electron doped magnetic semiconductors. The work is supported by the Macromolecular, Supramolecular and Nanochemistry program in the Division of Chemistry. A new route was discovered to produce both nanoparticles as well as nanorods of lanthanide chalcogenide semiconductors, which is easily adapted for doping studies. These novel materials may have useful applications in microelectronic devices, and should provide important mechanistic details of electronic and magnetic coupling in these unusual materials. Nanoparticles have been prepared by solution thermolysis of molecular precursors to form Eu1-xGdxS materials. The ferromagnetic ordering temperature can be increased by tuning the doping level, x. In addition, using hydrothermal synthesis it is possible to synthesize Eu2O3 nanowires and nanorods that can be chemically converted into EuO nanomaterials maintaining morphology and single crystal structures. This procedure should provide a route to forming Gd doped EuO materials. This proposal will study the effect of electron doping (Gd) on magnetic semiconductors EuS and EuO, as well as the effect of morphology (nanoparticle diameter and nanowire structures).This project involves the study of magnetic semiconductors which have applications in both data storage and information processing. The work is highly interdisciplinary between chemistry and physics, and involves both the synthesis and characterization of novel nanostructured magnetic materials. The team spans the educational ladder from high school seniors to senior graduate students, who work in a collaborative laboratory setting. In order to fully characterize these materials, a new collaboration has been established with a faculty at the University of Pierre and Marie Curie in Paris. The PI is also involved in outreach programs as co-Director of Science in the Public Interest, which introduces science students to science policy in government.

在这一建议中，乔治敦大学的Stoll教授将合成并表征纳米结构的电子掺杂的磁性半导体。这项工作得到了化学划分的大分子，超分子和纳米化学计划的支持。 发现了一条新的途径，以产生纳米颗粒以及灯笼甲氧化果仁元半导体的纳米棒，这很容易适应兴奋剂研究。 这些新型材料可能在微电子设备中具有有用的应用，并应提供这些异常材料中电子和磁耦合的重要机械详细信息。 纳米颗粒已通过溶液热解制备分子前体形成EU1-XGDXS材料。通过调整掺杂水平x可以提高铁磁排序温度。 此外，使用热液合成可以合成EU2O3纳米线和纳米棒，这些EU2O3纳米线和纳米棒可以化学转化为保持形态和单晶结构的EUO纳米材料。 此过程应提供形成GD掺杂EUO材料的途径。 该建议将研究电子掺杂（GD）对磁性半导体EUS和EUO的影响，以及形态学的影响（纳米颗粒直径和纳米线结构）。该项目涉及对数据存储和信息处理中应用的磁性半导体的研究。 这项工作是化学和物理学之间高度跨学科的，并且涉及新型纳米结构磁性材料的合成和表征。 该团队跨越了从高中生到高级研究生的教育阶梯，他们在合作实验室工作。 为了充分表征这些材料，在巴黎皮埃尔大学和玛丽·居里大学建立了新的合作。 PI还参与了作为公共利益的科学联合主任的外展计划，该计划将科学专业的学生介绍给政府科学政策。