A Nonlinear Optical Approach to Patchy Particles

斑块粒子的非线性光学方法

• 批准号: 1006753
• 负责人: Hans Robinson
• 金额: $ 50万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1006753&HistoricalAwards=false
• 关键词: Nonlinear; Optical; Approach; Patchy; Particles

TECHNICAL SUMMARY:This program, supported by the Solid State and Materials Chemistry program, aims to demonstrate a new class of "patchy particles", particles where the surface is patterned with discrete interaction sites that attract or repel complementary sites on other particles - for the purposes of guiding the self-assembly of complex structures with high precision and yield. The technique is optical in nature and relies on the propensity of the plasmonic resonances in metal nanoparticles to concentrate incident light into very small volumes where the electromagnetic field is greatly enhanced. These volumes, known as ?hotspots?, are located at sharp corner or narrow gaps on or between particles. The project will use photoreactive linkers to guide additional particles to bind exclusively at the hotspots so that colloidal molecules can be fabricated in a manner analogous to conventional chemistry, but with nanoparticles instead of atoms. Two simple examples of such structures are a dumbbell shape where two spherical particles are attached to each end of a central rod-shaped particle and a triangular prism where a sphere is attached at each corner. Since the method can be used iteratively, significantly more complex structures, such as branched chains or dendrites, are also possible. Because of the large and rapidly growing variety of silver and gold nanoparticles that can be fabricated, and the numerous types of available photoreactive compounds , this project would represent a significant increase in the number and variety of structures that are feasible within the patchy particle self-assembly paradigm.NON-TECHNICAL SUMMARY:It is now possible to create particles and structures at the nanometer scale with a great deal of variety and precision. The next great challenge is to assemble these building blocks into more complex ordered structures combining different geometries and materials. This project develops an enabling new method using nanoparticles made of silver and gold as the central building blocks. Its success will have implications both for fundamental science and for applied fields such as biomedicine and nanoelectronics, and will therefore help maintain American leadership is these technologically and economically important fields. The project will also help educate the next generation of Ph.D. level workers ready to take leadership positions in interdisciplinary projects at the forefront of science and engineering.

该计划由固态和材料化学计划支持，旨在展示一类新的“片状颗粒”，颗粒表面图案化有离散的相互作用位点，吸引或排斥其他颗粒上的互补位点-用于指导具有高精度和产量的复杂结构的自组装。该技术本质上是光学的，并且依赖于金属纳米颗粒中的等离子体共振的倾向，以将入射光集中到非常小的体积中，其中电磁场被大大增强。这些书，被称为？热点？位于颗粒上或颗粒之间的尖角或窄间隙处。该项目将使用光反应连接器来引导额外的颗粒仅在热点处结合，以便可以以类似于传统化学的方式制造胶体分子，但使用纳米颗粒而不是原子。这种结构的两个简单的例子是哑铃形状，其中两个球形颗粒连接到中心杆状颗粒的每个端部，以及三棱柱，其中球体连接在每个角部。由于该方法可以迭代使用，因此也可以使用明显更复杂的结构，例如支链或树突。由于可以制造的银和金纳米颗粒的种类繁多且快速增长，以及可用的光反应化合物的众多类型，该项目将代表在片状颗粒自组装范例中可行的结构的数量和种类的显著增加。非技术总结：现在可以在纳米尺度上以大量的种类和精度创建颗粒和结构。下一个巨大的挑战是将这些构建块组装成更复杂的有序结构，结合不同的几何形状和材料。该项目开发了一种新的方法，使用由银和金制成的纳米颗粒作为中心构建块。它的成功将对基础科学和生物医学和纳米电子学等应用领域产生影响，因此将有助于保持美国在这些技术和经济重要领域的领导地位。该项目还将帮助教育下一代博士。水平工人准备采取跨学科项目的领导地位在科学和工程的前沿。