The electronic structure and dynamics of clean and adsorbate modified graphene

清洁和吸附改性石墨烯的电子结构和动力学

• 批准号: 0911456
• 负责人: Hrvoje Petek
• 金额: $ 49.5万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0911456&HistoricalAwards=false
• 关键词: electronic; structure; dynamics; clean; adsorbate

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). In this research project supported by the Experimental Physical Chemistry Program, Professors Hrvoje Petek and Jin Zhao will study the electronic structure of graphene, a single atom thick, sheet-like allotrope of the element carbon. The study will focus on electronic states of graphene above the sp2 network that engender nearly free-electron (metallic) behavior. The experimental strategy is to perturb the majority carrier concentration in these states chemically or through optical excitation and measure the changes in electronic structure and dynamic processes such as electron-phonon and screening interactions. The experimental work will involve two interferometric time-resolved electron emission techniques, namely two photon photoemission (ITR-2PP) and photoelectron emission microscopy (ITR-PEEM) and transient electro-optic reflectivity (TEOR) measurements. Calculations of the graphene structure using Density Functional Theory (DFT) will also be done in parallel with the experiments.Graphene is an interesting material that may have important applications in future electronics and sustainable energy technologies. The research of Professors Petek and Zhao will provide important information on the structure and electronic properties of graphene that will be critical in establishing its applicability and performance in these technologies. The research will also provide a rich vehicle for graduate student training in both experiment and theory. The Petek and Zhao groups will also participate in outreach activities to promote an understanding of science and research in the Pittsburgh area public schools.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。在这个由实验物理化学计划支持的研究项目中，Hrvoje Petek和Jin Zhao教授将研究石墨烯的电子结构，石墨烯是碳元素的单原子厚，片状同素异形体。这项研究将集中在sp2网络之上的石墨烯的电子状态，产生接近自由电子（金属）的行为。实验策略是通过化学或光激发来扰动这些状态下的多数载流子浓度，并测量电子结构和动力学过程（如电子-声子和屏蔽相互作用）的变化。实验工作将涉及两种干涉时间分辨电子发射技术，即双光子光电发射（ITR-2 PP）和光电子发射显微镜（ITR-PEEM）和瞬态电光反射率（TEOR）测量。石墨烯是一种有趣的材料，可能在未来的电子和可持续能源技术中有重要的应用。Petek和Zhao教授的研究将提供有关石墨烯结构和电子性质的重要信息，这对于确定其在这些技术中的适用性和性能至关重要。本研究也将为研究生培养提供丰富的实验和理论工具。Petek和Zhao小组还将参加外展活动，以促进匹兹堡地区公立学校对科学和研究的理解。