Tip Directed-Assembly of Nanoparticles via Surface-Plasmon Excitation

通过表面等离子体激发的尖端定向组装纳米粒子

• 批准号: 0800658
• 负责人: Jeffrey Hastings
• 金额: $ 50万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2013-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0800658&HistoricalAwards=false
• 关键词: Tip; Directed; Assembly; Nanoparticles; via

The overall objective of this effort is to establish the theoretical and experimental foundation for tip-directed nanoparticle assembly using surface-plasmon excitation. Specific research objectives include expanding understanding of (1) optical excitation, heating, and cooling of nanoparticle/nanoprobe systems; (2) melting, fusion, and evaporation of nanoparticles; and (3) factors involved in scaling up directed nano-assembly for manufacturing. The research approach exploits the unique optical and thermal properties of metallic nanoparticles. Specifically, certain metal nanoparticles can be selectively heated using optical excitation at their surface plasmon resonance wavelength. The presence of a sharp, nanoscale tip, under control of an atomic force microscope in this case, spatially localizes the excitation. Finally, nanoparticles melt at temperatures significantly below their bulk melting temperatures allowing fusion of the particles into desired structures and ultimately into active nanoscale devices. Both multi-physics simulations and tip-based assembly experiments will be conducted to determine the conditions required for optimal resolution, throughput, and reproducibility of the assembly process.The investigation of tip directed nanoparticle assembly will have a far reaching impact on the understanding of nanoscale electromagnetics and thermal transport. This new nano-manufacturing technique will have broad societal impact by enabling the production of active devices, with applications in fields such as computing, communications, and medicine, from nanoscale building blocks. In addition, this relatively simple and low-cost nano-assembly approach will make nano-manufacturing technology more widely accessible. In order to establish a highly-trained nanotechnology workforce, participants will receive extensive interdisciplinary training in nanoscale optics, thermal sciences, fabrication, microscopy, metrology, and modeling. Outstanding undergraduate participants will be drawn from the University of Kentucky?s Nanoscale Engineering Certificate Program (NECP) and the Honors Program on Nanotechnology. In addition, the project provides a foundation for nanotechnology and optics related outreach efforts to high schools students in both urban and Appalachian regions of Kentucky.

这项工作的总体目标是建立使用表面等离子体激发的尖端定向纳米粒子组装的理论和实验基础。具体的研究目标包括扩大对(1)纳米颗粒/纳米探针系统的光激发、加热和冷却；(2)纳米颗粒的熔融、融合和蒸发；以及(3)扩大定向纳米组装制造所涉及的因素的理解。这种研究方法利用了金属纳米颗粒独特的光学和热学性质。具体地说，某些金属纳米粒子可以利用其表面等离子体共振波长的光激发来选择性加热。在这种情况下，在原子力显微镜的控制下，存在一个尖锐的纳米级尖端，在空间上定位激发。最后，纳米粒子在显著低于其整体熔化温度的温度下熔化，从而使粒子融合到所需的结构中，并最终融合到活性纳米设备中。多物理模拟和针尖组装实验将被用来确定组装过程的最佳分辨率、吞吐量和重复性所需的条件。针尖定向纳米粒子组装的研究将对理解纳米尺度的电磁学和热输运产生深远的影响。这种新的纳米制造技术将产生广泛的社会影响，使人们能够从纳米级的积木中生产出具有计算、通信和医学等领域应用的有源设备。此外，这种相对简单和低成本的纳米组装方法将使纳米制造技术更广泛地获得。为了建立一支训练有素的纳米技术队伍，参与者将接受纳米光学、热科学、制造、显微镜、计量学和建模方面的广泛跨学科培训。优秀的本科生将从肯塔基大学S纳米工程证书项目和纳米技术荣誉项目中脱颖而出。此外，该项目还为肯塔基州城市和阿巴拉契亚地区的高中生开展与纳米技术和光学相关的推广工作奠定了基础。