Theory of Novel Nanostructures: Symmetry and Surface Interactions

新型纳米结构理论：对称性和表面相互作用

• 批准号: 0305035
• 负责人: Vincent Crespi
• 金额: $ 27万
• 依托单位: Pennsylvania State Univ University Park
• 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: 2003-06-15 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0305035&HistoricalAwards=false
• 关键词: Theory; Novel; Nanostructures; Symmetry; Surface

This award supports theoretical research that seeks to understand and advance the manipulation of the structural and electronic properties of nanoscale materials, particularly those based on carbon, silicon and germanium, since these elements have a wide range of tunable semiconducting and metallic behaviors within robust covalently bonded packages at high symmetry. This research is designed to advance fundamental knowledge on nanostructures and also to contribute towards the body of understanding necessary to use these structures in future devices. The research will explore the role of surface energetics in designing a new forms of surface doping for semiconducting nanowires, modeling the transduction of translational to rotational motion in multiwalled nanotubes, exploring unusual commensuration effects in tube/graphite interactions (which may allow separation of nanotubes by helical angle), and establishing the relation between bending and transverse collapse in carbon nanotubes. A second theme of many nanoscale materials is the ability to exploit high symmetry and phase coherence to tune electronic and mechanical properties; research here will study the fascinating interplay of topology and electronic structure in graphene cones and focus mechanical distortions of graphene-based nanostructures into lower-dimensional loci to electronically cleaved nanotubes and create inverted cones.The work will have a immediate broader impact on society as well. Previous NSF funding has supported underrepresented students. The principal investigator continues to be involved with outreach activities such as helping design a materials demonstration show for twenty-two science museums nationwide, giving presentations at a Harry Potter summer science camp for fifth to eighth graders, presenting topics on fullerenes and superconductivity to visiting high school classes, etc. The research conducted in the current award will be incorporated into similar outreach activities. %%%This award supports theoretical research that seeks to understand and advance the manipulation of the structural and electronic properties of nanoscale materials, particularly those based on carbon, silicon and germanium, since these elements have a wide range of tunable semiconducting and metallic behaviors within robust covalently bonded packages at high symmetry. This research is designed to advance fundamental knowledge on nanostructures and also to contribute towards the body of understanding necessary to use these structures in future devices.The work will have a immediate broader impact on society as well. Previous NSF funding has supported underrepresented students. The principal investigator continues to be involved with outreach activities such as helping design a materials demonstration show for twenty-two science museums nationwide, giving presentations at a Harry Potter summer science camp for fifth to eighth graders, presenting topics on fullerenes and superconductivity to visiting high school classes, etc. The research conducted in the current award will be incorporated into similar outreach activities.***

该奖项支持旨在理解和推进对纳米级材料的结构和电子特性的操纵，尤其是基于碳，硅和锗的理论研究，因为这些元素具有广泛的可调半导体和金属的可调性和金属性行为，在高度对称性的稳健共键合包装中。 这项研究旨在促进有关纳米结构的基本知识，并为在未来设备中使用这些结构所必需的理解带来贡献。 这项研究将探讨表面能源在设计半导体纳米线的新形式的表面掺杂形式中的作用，对多壁纳米管中转化向旋转运动的转换对旋转运动的转变，探索在管/石墨相互作用中的异常交流，并允许通过旋转的旋转和旋转的旋转范围（均可通过螺旋管分离），并分离纳米管的分离。纳米管。 许多纳米级材料的第二个主题是能够利用高对称性和相干性来调整电子和机械性能的能力。这里的研究将研究石墨烯锥中拓扑结构和电子结构的引人入胜的相互作用，并将基于石墨烯的纳米结构的机械扭曲聚焦为较低维的基因座，以电子裂解的纳米管并创建反转锥。工作将立即对社会产生更大的广泛影响。 以前的NSF资金支持代表性不足的学生。 首席调查员继续参与外展活动，例如帮助设计全国22个科学博物馆的材料演示表演，在哈利·波特夏季科学训练营中进行了五年级至八年级学生的演讲，对富勒梅纳斯的主题和超级导向介绍了访问高中课程的超级导向，等等。该奖项支持旨在理解和推动对纳米级材料的结构和电子特性的操纵，尤其是基于碳，硅和锗的结构和电子特性的理论研究，因为这些元素在高音配合的可连接共键合中具有多种可调的半导体和金属行为。 这项研究旨在提高有关纳米结构的基本知识，并为在未来设备中使用这些结构所必需的理解贡献。这项工作也将对社会产生更广泛的影响。 以前的NSF资金支持代表性不足的学生。 首席调查员继续参与外展活动，例如帮助设计全国22个科学博物馆的材料演示表演，在哈利·波特夏季科学训练营中的五年级至八年级学生的演讲，介绍了富勒梅纳人的主题，并介绍了有关访问高中课程的超级导向。