Inter-American Materials Collaboration: Correlating Erbium Structure with Host Geometry in Doped Silicon Nanocrystals and Nanowires

美洲材料合作：将铒结构与掺杂硅纳米晶体和纳米线中的主体几何结构相关联

• 批准号: 0303366
• 负责人: Jeffery Coffer
• 金额: $ 4.9万
• 依托单位: Texas Christian University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-15 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0303366&HistoricalAwards=false
• 关键词: Inter; American; Materials; Collaboration; Correlating

This Inter-American Materials Collaboration research focuses on fundamental investigations of rare earth-doped silicon nanocrystals and nanowires through an exchange of junior scientists, with directed interdisciplinary research training, between the groups of Jeff Coffer of the Texas Christian University Department of Chemistry and Leandro Tessler of the Department of Applied Physics at the State University of Campinas, Sao Paulo, Brazil. The research examines the fundamentals of confinement of the rare earth in the nanostructure. This is being evaluated in terms of: size dependence of the host crystalline Si, average Er 3+ concentration, local Er3+ coordination, and average Er3+ location for doped, soluble nanocrystals isolated from pyrolysis reactions. Centering on the high temperature pyrolysis of disilane (Si2H6 ) or silane (SiH4) and a rare earth precursor complex under carefully-controlled conditions, the resultant nanostructures are being characterized by photoluminescence (PL) spectroscopy, UV/visible optical absorption spectroscopy, transmission electron microscopy / high resolution electron microscopy (TEM/HREM), Raman spectroscopy, and Extended X-ray Absorption Fine Structure (EXAFS) measurements. EXAFS measurements performed at the Brazilian National Light Source are crucial to correlating local erbium structure with other structural features of the nanostructure, including its associated photophysical behavior. Site-specific control of any dopant atoms is a central and unanswered issue in the legitimate structural control of the next generation of nanoscale electronic materials. The international collaboration provides an interdisciplinary training experience to the junior scientists in materials chemistry at TCU, their counterparts in applied physics in Brazil, and permits the evolution of future research opportunities through networking for all involved. This award is supported by the Division of Materials Research, the Office of International Science and Engineering, and the Office of Multidisciplinary Activities in the Directorate for Mathematical and Physical Sciences.

这项美洲材料合作研究的重点是通过初级科学家之间的交流，在有针对性的跨学科研究培训的情况下，在德克萨斯基督教大学化学系的杰夫·科弗和巴西圣保罗坎皮纳斯州立大学应用物理系的莱安德罗·特斯勒之间进行稀土掺杂硅纳米晶和纳米线的基础研究。这项研究考察了稀土在纳米结构中受到限制的基本原理。这是通过以下几个方面进行评估的：宿主晶体硅的尺寸依赖性、平均Er3+浓度、局部Er3+配位以及从热解反应中分离出的掺杂的可溶纳米晶的平均Er3+位置。以二硅烷(Si2H6)或硅烷(SiH4)和稀土前驱体络合物在严格控制的条件下高温热解为中心，用光致发光光谱(PL)、紫外/可见光吸收光谱、透射电子显微镜/高分辨电子显微镜(TEM/HREM)、拉曼光谱和扩展X射线吸收精细结构(EXAFS)测量对所得纳米结构进行了表征。在巴西国家光源上进行的EXAFS测量对于将局部铒结构与纳米结构的其他结构特征，包括其相关的光物理行为联系起来至关重要。在下一代纳米电子材料的合法结构控制中，对任何掺杂原子的特定位置控制是一个核心和尚未回答的问题。这一国际合作为TCU的材料化学初级科学家以及巴西应用物理学的初级科学家提供了跨学科的培训经验，并通过为所有参与者建立网络来发展未来的研究机会。该奖项由材料研究部、国际科学和工程办公室以及数学和物理科学局的多学科活动办公室提供支持。