Theory of Novel Nanostructures: Symmetry and Surface Interactions

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，因为这些元素在高对称性的强大共价键合封装中具有广泛的可调谐半导体和金属行为。这项研究旨在提高纳米结构的基础知识，并有助于在未来的设备中使用这些结构所必需的理解。研究将探索表面能量学在设计半导体纳米线表面掺杂新形式中的作用，模拟多壁纳米管中平移运动到旋转运动的转导，探索管/石墨相互作用中的异常通约效应（这可能允许纳米管通过螺旋角分离），以及建立碳纳米管弯曲和横向坍塌之间的关系。许多纳米级材料的第二个主题是利用高对称性和相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畸变聚焦到电子切割纳米管的低维位点上，并创建倒锥。这项工作也将对社会产生直接而广泛的影响。以前的国家科学基金资助的是代表性不足的学生。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，在五年级到八年级的哈利波特暑期科学营做演讲，向访问的高中班级介绍富勒烯和超导的主题，等等。在当前奖项中进行的研究将纳入类似的外展活动。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，因为这些元素在高对称性的强大共价键合封装中具有广泛的可调谐半导体和金属行为。这项研究旨在提高纳米结构的基础知识，并有助于在未来的设备中使用这些结构所必需的理解。这项工作也将对社会产生直接而广泛的影响。以前的国家科学基金资助的是代表性不足的学生。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，在五年级到八年级的哈利波特暑期科学营做演讲，向访问的高中班级介绍富勒烯和超导的主题，等等。本奖项所进行的研究将纳入类似的外展活动

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.***