Surface chemistry and growth manipulation of supported metal clusters and hybrid nanostructured materials

支撑金属簇和混合纳米结构材料的表面化学和生长操纵

• 批准号: 1954-2012
• 负责人: Leung, Tong
• 金额: $ 6.27万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=513068
• 关键词: Surface; chemistry; growth; manipulation; supported

Understanding the chemical processes occurring on surfaces is fundamentally important to many areas of science and technology, including chemical and petrochemical technologies, environmental science, materials research, molecular electronics, and nanotechnology. The proposed work seeks to study the surface chemistry and physics occurring on novel substrates, from metallic clusters (of a few atoms to a few nanometers in size) supported on single-crystal silicon surfaces to nanostructures of transparent conductive oxides (e.g. tin oxide). Our study will focus on adsorbates of biochemical interest, and will follow the evolution of their structures and electronic properties upon adsorption on these substrates and upon stimulation with heat and low-energy electrons. Using specialized tools that allow us to precisely deposit one atom or molecule at a time (i.e. molecular beam epitaxy), we will develop the appropriate growth strategies to obtain a near-monosized distribution of these metal clusters on the silicon substrate. Using a laser ablation technique, we will also be able to build a variety of one-dimensional and two-dimensional nanostructures of transparent conductive oxides. These novel nanomaterials will not only provide important test beds for investigating fundamental processes occurring on their complex surfaces, but also serve as the basic platforms for developing emerging applications in catalysis, biosensing, extended-release drug delivery, solar cell devices and single-nanostructure electronics. We will focus on three general areas of interest: (1) Growth of metal clusters, with special emphasis on how the initial nucleation sites on the silicon support will affect the geometries and structures of the clusters; (2) Interactions of DNA base molecules with metal clusters as a function of cluster size; and (3) Growth manipulation of hybrid nanostructures of bimetallic systems (nanoalloys) and of transparent conductive oxides that are of respective interest to nanocatalysis and nanomagnetics applications and to solar cell applications.

了解表面上发生的化学过程对许多科学和技术领域至关重要，包括化学和石化技术，环境科学，材料研究，分子电子学和纳米技术。 拟议的工作旨在研究发生在新型基板上的表面化学和物理，从单晶硅表面上支持的金属簇（几个原子到几个纳米大小）到透明导电氧化物（例如氧化锡）的纳米结构。 我们的研究将集中在生物化学感兴趣的吸附物，并将遵循其结构和电子性质的演变后，吸附在这些基板上，并在刺激与热和低能电子。 使用允许我们一次精确存款一个原子或分子的专门工具（即分子束外延），我们将开发适当的生长策略，以获得这些金属团簇在硅衬底上的近单尺寸分布。 使用激光烧蚀技术，我们还将能够构建各种一维和二维透明导电氧化物纳米结构。 这些新型纳米材料不仅将为研究其复杂表面上发生的基本过程提供重要的测试平台，而且还将作为开发催化，生物传感，缓释药物递送，太阳能电池器件和单纳米结构电子学等新兴应用的基础平台。 我们将集中在三个感兴趣的一般领域：（1）金属簇的生长，特别强调如何在硅载体上的初始成核位置将影响簇的几何形状和结构;（2）DNA碱基分子与金属簇的相互作用作为簇大小的函数;以及（3）纳米体系杂化纳米结构的生长控制纳米合金（nanoalloys）和透明导电氧化物，其分别对纳米催化和纳米磁性应用以及太阳能电池应用有意义。