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.***

该奖项支持理论研究，旨在理解和推进纳米材料的结构和电子特性的操纵，特别是那些基于碳，硅和锗的材料，因为这些元素在高度对称的坚固的共价键合封装中具有广泛的可调半导体和金属行为。 这项研究旨在推进纳米结构的基础知识，并有助于在未来设备中使用这些结构所需的理解。 该研究将探索表面能量学在设计半导体纳米线的新形式的表面掺杂中的作用，模拟多壁纳米管中平移到旋转运动的转换，探索管/石墨相互作用中不寻常的膨胀效应（这可能允许通过螺旋角分离纳米管），并建立碳纳米管弯曲和横向塌陷之间的关系。 许多纳米材料的第二个主题是利用高对称性和相位相干性来调节电子和机械性质的能力;这里的研究将研究石墨烯锥体中拓扑结构和电子结构的迷人相互作用，并将石墨烯基纳米结构的机械扭曲集中在较低的三维轨迹的电子切割纳米管，并创造倒锥。这项工作将有立即更广泛的影响，以及社会。 此前，NSF的资金支持了代表性不足的学生。 首席研究员继续参与外展活动，如帮助设计全国22个科学博物馆的材料展示，在哈利波特夏令营为五至八年级学生做演讲，向访问高中班级介绍富勒烯和超导性的主题等。该奖项支持旨在理解和推进纳米级材料的结构和电子特性操纵的理论研究，特别是那些基于碳，硅和锗的材料，因为这些元素在高对称性的坚固共价键合封装中具有广泛的可调半导体和金属行为。 这项研究旨在推进纳米结构的基础知识，并为在未来设备中使用这些结构所需的理解做出贡献。这项工作也将对社会产生更广泛的影响。 此前，NSF的资金支持了代表性不足的学生。 首席研究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展示，在五至八年级的哈利波特夏季科学夏令营中发表演讲，向来访的高中班级介绍富勒烯和超导性的主题等。