Transient absorption microscopy studies of the dynamics of single metal and semiconductor nanostructures

单金属和半导体纳米结构动力学的瞬态吸收显微镜研究

• 批准号: 1502848
• 负责人: Gregory Hartland
• 金额: $ 59.66万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1502848&HistoricalAwards=false
• 关键词: Transient; absorption; microscopy; studies; dynamics

Prof. Gregory V. Hartland of the University of Notre Dame is supported by the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program in the Division of Chemistry to study chemical reactions and the conduction of electrons in metal nanowires. The results from these experiments are important for developing ultra-sensitive mass sensors and circuits that use light instead of electrical current to transport information. If successful, this innovation will allow miniaturization of circuits and sensors to nanoscale dimensions. Both graduate and undergraduate students are participating in this research. The undergraduate students are being recruited to the project from the University of Notre Dame, as well as from nearby four-year colleges in the northern Indiana area that have limited research facilities. The undergraduate and graduate students are also involved in a series of outreach activities that connect to local high school students in the South Bend area. The experiments that are being conducted are providing new information about how nano-materials interact with their environment, and how these interactions are different to those of macroscopic objects. The effects that are being explored include the role of surface bound molecules in mediating energy relaxation in nanomaterials, whether simple solvents such as water behave like viscoelastic solvents at nanoscale dimensions, and the way the environment influences the properties of surface plasmon polaritons - which are electromagnetic magnetic waves that propagate at the surfaces of the nanowires. These measurements are being performed using transient absorption microscopy, which is an experimental technique that allows ultrafast laser measurements to be performed on single nano-objects. Simulations are also being conducted as part of the project. Comparison of the experimental results to the simulations is generating information about the properties of the materials that can be used by other researchers in different areas of science and engineering.

圣母大学的 Gregory V. Hartland 教授得到化学系高分子、超分子和纳米化学 (MSN) 项目的支持，研究化学反应和金属纳米线中的电子传导。这些实验的结果对于开发使用光而不是电流来传输信息的超灵敏质量传感器和电路非常重要。 如果成功，这项创新将使电路和传感器小型化至纳米级尺寸。研究生和本科生都参与了这项研究。该项目的本科生是从圣母大学以及印第安纳州北部地区附近研究设施有限的四年制大学招募的。 本科生和研究生还参与了一系列与南本德地区当地高中生联系的外展活动。正在进行的实验提供了有关纳米材料如何与其环境相互作用以及这些相互作用与宏观物体有何不同的新信息。 正在探索的效应包括表面结合分子在介导纳米材料能量弛豫中的作用、水等简单溶剂在纳米尺度上是否表现得像粘弹性溶剂，以及环境影响表面等离子体激元性质的方式——表面等离子体激元是电磁的。在纳米线表面传播的磁波。这些测量是使用瞬态吸收显微镜进行的，这是一种实验技术，可以在单个纳米物体上进行超快激光测量。 作为该项目的一部分，模拟也正在进行中。 将实验结果与模拟结果进行比较，生成有关材料特性的信息，可供不同科学和工程领域的其他研究人员使用。

项目成果

Far-field midinfrared superresolution imaging and spectroscopy of single high aspect ratio gold nanowires

单根高长径比金纳米线的远场中红外超分辨率成像和光谱学

• DOI: 10.1073/pnas.1916433117
• 发表时间: 2020-01-21
• 期刊: Proceedings of the National Academy of Sciences
• 作者: Kyle Aleshire;I. Pavlovetc;R. Collette;X. Kong;P. Rack;Shubin Zhang;D. Masiello;J. Camden;G. Hartl;M. Kuno
• 通讯作者: M. Kuno