Optical and Magnetic Spectroscopy of Carbon-Based Materials

碳基材料的光学和磁谱分析

• 批准号: 0907266
• 负责人: James Kikkawa
• 金额: $ 31.5万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907266&HistoricalAwards=false
• 关键词: Optical; Magnetic; Spectroscopy; Carbon; Based

****NON-TECHNICAL ABSTRACT****This individual investigator award supports a research project that aims to deepen our understanding of carbon networks, a class of emerging materials with potential to create revolutionary multifunctional electronics. Carbon networks, including graphene and carbon nanotubes, are predicted to have fascinating electronic, optical and magnetic properties, where small changes in atomic arrangements can dramatically alter their behavior. As progress in this field moves forward, researchers need increasingly creative tools to study the electronic properties of carbon nanomaterials. This work leverages methods pioneered by the PI to use magnetism as a non-invasive probe of electronic properties. As an example, disorder in planar networks of carbon is currently of great interest because such regions appear to couple to light and may also be useful in 'steering' electrons around in carbon devices. Dramatic changes in magnetic properties induced by disorder (caused by oxygen bonding to the network) have already been observed and provide an incisive tool for relating disorder to changes in the electronic landscape of these materials. This research will involve graduate students in collaborative work that will help them chart successful interdisciplinary careers. Support for this project will enable an expansion of outreach activities at an NSF funded Shared Equipment Facility (SEF), providing additional remote experiments and recruitment of new users. ****TECHNICAL ABSTRACT****This individual investigator project will study fundamental optical and magnetic properties of materials derived from hexagonal networks of carbon, including graphene, graphene oxide, and carbon nanotubes. Much of this research exploits important connections between orbital diamagnetism and local optical and transport properties. Specifically, the former provides a complementary probe of single-particle electronics that can often clarify the latter. In graphene oxide, changes in orbital diamagnetism will quantify aromatic network disruption that may hold a key to bandgap engineering and optical emission in that material. In the case of carbon nanotubes, a battery of highly purified samples will be used to understand how diamagnetism in carbon nanotubes depends on symmetry and atomic structure. For graphene, the possibility of magnetic anomalies that arise from quantum criticality at the Dirac point will be investigated. In addition, a unique collection of purified carbon nanotube samples will be used to provide a definitive map of carbon nanotube dark exciton energies as a function of atomic structure. This research will involve graduate students in collaborative work that will help them chart successful careers. Support for this project will enable an expansion of outreach activities at an NSF funded Shared Equipment Facility (SEF), providing additional remote experiments and recruitment of new users.

* 非技术摘要 * 这个个人研究者奖支持一个研究项目，旨在加深我们对碳网络的理解，碳网络是一类新兴材料，有可能创造革命性的多功能电子产品。 碳网络，包括石墨烯和碳纳米管，预计具有迷人的电子，光学和磁性，其中原子排列的微小变化可以显着改变它们的行为。随着该领域的进展，研究人员需要越来越多的创造性工具来研究碳纳米材料的电子特性。 这项工作利用PI开创的方法，将磁性用作电子特性的非侵入性探针。 作为一个例子，碳平面网络中的无序目前引起了极大的兴趣，因为这些区域似乎与光耦合，并且也可能有助于在碳设备中“引导”电子。 人们已经观察到无序（由氧与网络结合引起）引起的磁特性的巨大变化，并为将无序与这些材料的电子景观变化联系起来提供了一个精辟的工具。这项研究将涉及研究生的协作工作，这将有助于他们图表成功的跨学科的职业生涯。 对这一项目的支持将使国家科学基金会资助的共享设备设施（SEF）的推广活动得以扩大，提供更多的远程实验和招募新用户。* 技术摘要 * 这个个人研究项目将研究从碳的六边形网络衍生的材料的基本光学和磁性，包括石墨烯，氧化石墨烯和碳纳米管。 大部分研究利用轨道抗磁性和局部光学和输运性质之间的重要联系。 具体来说，前者提供了一个互补的单粒子电子探针，往往可以澄清后者。 在氧化石墨烯中，轨道抗磁性的变化将量化芳香族网络的破坏，这可能是该材料中带隙工程和光发射的关键。在碳纳米管的情况下，一组高度纯化的样品将用于了解碳纳米管中的抗磁性如何取决于对称性和原子结构。 对于石墨烯，将研究狄拉克点处量子临界性引起的磁异常的可能性。 此外，一个独特的收集纯化的碳纳米管样品将用于提供碳纳米管暗激子能量作为原子结构的函数的明确地图。这项研究将涉及研究生的协作工作，这将有助于他们图表成功的职业生涯。 对这一项目的支持将使国家科学基金会资助的共享设备设施（SEF）的推广活动得以扩大，提供更多的远程实验和招募新用户。