From Gas Phase Clusters to Nanomaterials

从气相团簇到纳米材料

• 批准号: 0503383
• 负责人: Lai-Sheng Wang
• 金额: $ 37.5万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-06-15 至 2009-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0503383&HistoricalAwards=false
• 关键词: Gas; Phase; Clusters; Nanomaterials

This project explores gas phase clusters as an ideal means to elucidate the novel size- and shape-dependent properties of nanoparticles. This research program focuses on a fundamental study of gas phase clusters with an emphasis on novel molecular structures and chemical bonding, as well as identifying potential cluster building blocks for new materials. The experiment involves photoelectron spectroscopy of size-selected clusters, produced by a laser vaporization supersonic cluster source. Special emphases are on clusters of group 13 elements (Boron and Aluminum), as well as clusters of group 14 (Silicon and Germanium) and 15 (Antimony and Bismuth) elements. Specific tasks include bare and mixed boron clusters, aluminum alloy clusters, aromatic clusters, metal carbide clusters, and exploratory synthesis of cluster-based nanomaterials. A major focus is to connect molecular properties to bulk properties and to discover structurally and electronically stable clusters for potential syntheses of cluster-based materials. Structurally known clusters in the solid state will also be examined in the gas phase to provide fundamental understanding about the principles underlying their stabilities, which may lead to the design of new classes of clusters. Both graduate and undergraduate students will be participating in the research project and receive research training in the emerging field of nanoscience and cutting edge research techniques in the synthesis and characterization of nanoclusters and nanomatierals. The research program is integrated to the teaching of a nanocourse, maximizing the impact of the research results. Nanoscience and nanotechnology have attracted worldwide attention. Materials in the nanometer size scale exhibit properties different from their bulk counterparts and these properties depend on particle size and shape. This forms the basis for nanoscience and nanotechnology. At the core of nanoscience is to understand the size-dependent behaviors of materials at the nanometer scale. Atomic clusters consisting of a few to few hundred atoms provide an ideal playground to elucidate the novel size- and shape-dependent properties of nanoparticles. This research program focuses on the fundamental investigation of atomic clusters with an emphasis on novel molecular structures and chemical bonding, as well as identifying potential cluster building blocks for new materials. Boron (B) and aluminum (Al) are light and form important alloys as structural materials in automobiles and airplanes. Understanding the nanoclusters of B and Al may lead to the design of better and stronger materials. Silicon is the cornerstone material for the microelectronic industry and understanding the properties of silicon nanoclusters may be relevant to the manufacture and function of future generations of computers. The training of the next generation researchers and scientists are important for the nation's technical competitiveness. Both graduate and undergraduate students will be participating in the research project and receive research training in the emerging field of nanoscience and cutting edge research techniques in the synthesis and characterization of nanoclusters and nanomatierals. The research program is also integrated to the teaching of a nanocourse, maximizing the impact of the research results.

该项目探索气相簇作为阐明纳米颗粒新颖的尺寸和形状依赖性特性的理想手段。 该研究计划侧重于气相团簇的基础研究，重点是新颖的分子结构和化学键合，以及识别新材料的潜在团簇构建块。该实验涉及由激光汽化超音速团簇源产生的选定尺寸团簇的光电子能谱。 特别重点是第 13 族元素（硼和铝）簇，以及第 14 族（硅和锗）和第 15 族（锑和铋）元素簇。 具体任务包括裸硼和混合硼簇、铝合金簇、芳香族簇、金属碳化物簇以及基于簇的纳米材料的探索性合成。 主要重点是将分子特性与整体特性联系起来，并发现结构和电子稳定的簇，用于潜在的簇基材料的合成。 结构已知的固态团簇也将在气相中进行检查，以提供对其稳定性原理的基本了解，这可能会导致新类别团簇的设计。研究生和本科生都将参与该研究项目，并接受纳米科学新兴领域以及纳米团簇和纳米材料合成和表征方面的尖端研究技术的研究培训。 该研究计划与纳米课程的教学相结合，最大限度地发挥研究成果的影响。纳米科学和纳米技术已引起全世界的关注。 纳米尺寸的材料表现出不同于块状材料的特性，这些特性取决于颗粒的尺寸和形状。 这构成了纳米科学和纳米技术的基础。 纳米科学的核心是了解纳米尺度材料的尺寸依赖性行为。 由几个到几百个原子组成的原子簇为阐明纳米粒子的新颖的尺寸和形状依赖性特性提供了理想的场所。 该研究计划侧重于原子团簇的基础研究，重点是新颖的分子结构和化学键合，以及识别新材料的潜在团簇构建块。 硼 (B) 和铝 (Al) 很轻，是作为汽车和飞机结构材料的重要合金。 了解 B 和 Al 的纳米团簇可能有助于设计出更好、更强的材料。 硅是微电子工业的基石材料，了解硅纳米团簇的特性可能与未来几代计算机的制造和功能相关。 下一代研究人员和科学家的培训对于国家的技术竞争力非常重要。 研究生和本科生都将参与该研究项目，并接受纳米科学新兴领域以及纳米团簇和纳米材料合成和表征方面的尖端研究技术的研究培训。 该研究项目还整合到纳米课程的教学中，最大限度地发挥研究成果的影响。