New Surface Chemistries and Process Innovations in the Production of Surface Functionalized Semiconductor Nanoparticles

表面功能化半导体纳米粒子生产中的新表面化学和工艺创新

• 批准号: 0726943
• 负责人: Brian Mitchell
• 金额: --
• 依托单位: Tulane University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-15 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0726943&HistoricalAwards=false
• 关键词: New; Surface; Chemistries; Process; Innovations

Silicon nanoparticles with alkyl-functionalized surfaces formed by mechanochemical methods are the focus of these investigations. In the mechanochemical process, silicon is comminuted in size using mechanical attrition in the presence of a reactive organic liquid. As fresh surface silicon atoms are exposed in the comminution process, they react with the organic medium to create functionalized nanoparticles. The scientific merit of the research lies in three specific goals: 1) to extend the concept to new chemistries including alkynes, alkenes, and dienes and their heteroatom anologues; 2) to evaluate process innovations that lead to the rapid production of uniform-sized functionalized nanoparticles via mechanochemical synthesis; and 3) to model the solubility and phase behavior of surface functionalized nanoparticles. The use of "click" chemistry will be explored as a way of increasing the complexity of the silicon surface and to create a functional architecture. New functionalized nanoparticles will be characterized primarily for their optoelectronic properties. Molecular dynamics simulations will be used to elucidate the effect of surface chain length on phase behavior and interparticle forces the lead to phase separation. Process innovations will be achieved through the study of multi-phase mechanochemical synthesis which will open new avenues to nanoparticle functionalization, separation, and production.Broader impacts include the potential applications for functionalized silicon nanoparticles in the areas of fluorescent biological staining labels, nanoparticle lasers, and solar energy. Educational and outreach activities include research experiences for undergraduates, minority participation in research projects, and international research opportunities through the German Academic Exchange Program.

通过机械化学方法形成的具有烷基官能化表面的硅纳米颗粒是这些调查的焦点。在机械化学方法中，在反应性有机液体的存在下使用机械研磨将硅粉碎。 当新鲜的表面硅原子在粉碎过程中暴露时，它们与有机介质反应以产生功能化的纳米颗粒。该研究的科学价值在于三个具体目标：1）将概念扩展到新的化学物质，包括炔，烯烃和二烯及其杂原子类似物; 2）评估通过机械化学合成快速生产均匀尺寸的功能化纳米颗粒的工艺创新; 3）模拟表面功能化纳米颗粒的溶解度和相行为。 “点击”化学的使用将被探索作为增加硅表面的复杂性和创建功能架构的一种方式。 新的功能化纳米粒子将主要表征其光电性能。 分子动力学模拟将用于阐明表面链长对相行为的影响以及导致相分离的颗粒间力。 通过多相机械化学合成的研究，将实现工艺创新，这将为纳米粒子的功能化、分离和生产开辟新的途径，更广泛的影响包括功能化硅纳米粒子在荧光生物染色标记、纳米粒子激光器和太阳能等领域的潜在应用。 教育和推广活动包括本科生的研究经验，少数民族参与研究项目，以及通过德国学术交流计划的国际研究机会。