Correlating Local Defect Structure with Dynamical Response in Graphene

将石墨烯中的局部缺陷结构与动态响应相关联

• 批准号: 1235361
• 负责人: Michael Crommie
• 金额: $ 32.4万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1235361&HistoricalAwards=false
• 关键词: Correlating; Local; Defect; Structure; Dynamical

The research objective of this award is to correlate the local, atomic-scale structure of graphene nanoresonators with their non-local oscillatory response at high driving frequencies. This will be performed by combining high-resolution scanning tunneling microscopy with high frequency opto-electric actuation techniques to probe suspended graphene membranes. We will investigate clamped, suspended membranes having diameters down to 25 nm, a regime that has so far been inaccessible to dynamical measurement. Using a combination of ion irradiation, high energy electrons, and adsorbate deposition, we will control and characterize specific defect and adsorbate configurations of graphene nanoresonators and monitor how this affects their resonant and dissipative behavior. The nonlinear tunnel current of a scanning tunneling microscope will be used here in a new rectifying mode that will serve as a sensitive probe of high frequency surface oscillatory amplitude and spatial eigenmodes. This will provide a powerful new tool for testing multi-scale theoretical models that combine atomistically defined defect configurations with continuum material properties.This research will explore new physical phenomena that have been predicted but never before observed, such as the effect of specific defect configurations on the dynamical susceptibility of strained, suspended graphene nanoresonators. The research will enable an entirely new technique of microscopy that marries atomic-scale spatial resolution with high-frequency dynamical characterization. This will facilitate the exploration of nanostructure processes and behavior that were previously inaccessible due to a lack of tools for simultaneously measuring the atomic scale properties and oscillatory response of individual clamped graphene nanoresonators. The potential impact on technology is strong, since this work should result in new types of nanoresonators that will be applicable in the areas of nano-electronics, communications, chemical detection, mass sensing, charge sensing, probing quantum fluctuations, and general exploration of elastic behavior at the atomic scale. The impact on education and outreach will also be strong. This project will provide scientific training to graduate students, undergraduates, and high school students in a strongly interdisciplinary area

该奖项的研究目标是将石墨烯纳米孔子的局部原子级结构与高驱动频率下的非本地振荡响应相关联。这将通过将高分辨率扫描隧道显微镜与高频光电动驱动技术结合起来来探测悬浮的石墨烯膜。我们将研究夹紧的，悬浮的膜，直径降低到25 nm，迄今为止，该状态无法访问动态测量。使用离子辐照，高能电子和吸附物沉积的组合，我们将控制和表征石墨烯纳米孔子的特定缺陷和吸附构型，并监测这如何影响其谐振和消散性行为。扫描隧道显微镜的非线性隧道电流将在这里以新的整流模式使用，该模式将用作高频表面振荡振幅和空间本本特征模的敏感探针。这将为测试多尺度理论模型提供一个强大的新工具，该模型将原子定义的缺陷配置与连续材料属性结合在一起。这项研究将探索已经预测但从未预测过但从未观察到的新的物理现象，例如特定缺陷配置对应变，悬浮的石墨烯纳米烯诺酯剂的动态易感性的影响。这项研究将实现一种全新的显微镜技术，该技术将原子尺度的空间分辨率与高频动力学特征结合在一起。这将促进由于缺乏同时测量原子量表性能和单个夹紧石墨烯纳米孔子的振荡响应的工具，因此以前无法访问的纳米结构过程和行为的探索。 对技术的潜在影响很大，因为这项工作应导致新型的纳米装饰物，这些纳米量子器将适用于纳米电子，通信，化学检测，质量感应，充电感，量子量的量子波动以及对原子量表上弹性行为的一般探索。对教育和外展的影响也将很大。该项目将为强烈的跨学科领域的研究生，本科生和高中生提供科学培训