Large-Scale and Predictable Organization of Nanocrystal Homo- and Heterojunctions through Polymer-Directed Processing

通过聚合物定向加工大规模且可预测地组织纳米晶体同质和异质结

• 批准号: 1200850
• 负责人: Andrea Tao
• 金额: $ 45.48万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1200850&HistoricalAwards=false
• 关键词: Large; Scale; Predictable; Organization; Nanocrystal

The research objective of this project is the scalable fabrication of plasmonic nanojunctions, the nanometer-sized gaps created between high-curvature metal surfaces that produce intense electromagnetic ?hot spots.? In this project, metal nanocrystals will be self-organized to form precise nanojunctions by carrying out phase segregation within a nanocrystal-polymer composite. Nanocrystals will be assembled with respect to shape and orientation to create homojunction (similar) and heterojunction (dissimilar) nanocrystal pairs. Molecular simulations will be used to deduce the global phase diagram of the multicomponent nanocrystal-polymer mixtures and to predict the mechanisms and kinetics of large-scale nanocrystal assembly. Guided by simulations, nanocrystals will be chemically modified by polymer grafts with tailored chain lengths, grafting density, and charge. Detailed morphology studies of the resulting nanocomposite will provide insight into how the chemical nature of the nanocrystal surface can be used to tune the key intermolecular interactions that regulate orientation and arrangement of the plasmonic nanojunctions.The results of this project will facilitate the successful fabrication of large-area, non-close-packed plasmonic nanocrystals arrays that are currently inaccessible by top-down fabrication methods. These nanomaterials will be designed for integration into optical device platforms for applications such as subwavelength focusing, surface-enhanced Raman spectroscopy, and electromagnetic transparency. This work will also provide a fundamental understanding of the general mechanisms governing polymer-directed nanocrystal assembly. By establishing a close collaboration between experiment and theory, this work has the potential for the discovery of novel self-assembly pathways and mechanisms for achieving new and complex nanomaterials architectures. In addition, this research project will contribute to the education of pre-college, undergraduate, and graduate students in the field of nanoengineering. This includes the design of new laboratory modules and research-based coursework for undergraduates as well as outreach activities that will increase the overall diversity of the undergraduate engineering population at UCSD.

该项目的研究目标是等离子体纳米结的可扩展制造，纳米尺寸的间隙之间的高曲率金属表面，产生强烈的电磁？热点？在这个项目中，金属纳米晶体将通过在纳米晶体-聚合物复合材料中进行相分离而自组织形成精确的纳米结。纳米晶体将根据形状和取向组装，以产生同质结（相似）和异质结（不相似）的异质结对。分子模拟将用于推导多组分纳米晶-聚合物混合物的全局相图，并预测大规模纳米晶组装的机理和动力学。在模拟的指导下，纳米晶体将通过具有定制链长、接枝密度和电荷的聚合物接枝物进行化学修饰。对所得纳米复合材料的详细形态学研究将深入了解如何利用表面的化学性质来调节调节等离子体纳米结的取向和排列的关键分子间相互作用，该项目的结果将有助于成功制造大面积，非紧密堆积的等离子体纳米晶体阵列，这些阵列目前无法通过自上而下的制造方法获得。这些纳米材料将被设计成集成到光学设备平台的应用，如亚波长聚焦，表面增强拉曼光谱，和电磁透明。这项工作也将提供一个基本的了解，一般机制，管理聚合物导向的聚合物组装。通过建立实验和理论之间的密切合作，这项工作有可能发现新的自组装途径和机制，以实现新的和复杂的纳米材料结构。此外，该研究项目将有助于大学预科，本科和研究生在纳米工程领域的教育。这包括为本科生设计新的实验室模块和基于研究的课程，以及将增加UCSD本科工程人口整体多样性的外联活动。