International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208, USA.
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
Science. 2018 Feb 9;359(6376):669-672. doi: 10.1126/science.aaq0591. Epub 2018 Jan 18.
DNA programmable assembly has been combined with top-down lithography to construct superlattices of discrete, reconfigurable nanoparticle architectures on a gold surface over large areas. Specifically, the assembly of individual colloidal plasmonic nanoparticles with different shapes and sizes is controlled by oligonucleotides containing "locked" nucleic acids and confined environments provided by polymer pores to yield oriented architectures that feature tunable arrangements and independently controllable distances at both nanometer- and micrometer-length scales. These structures, which would be difficult to construct by other common assembly methods, provide a platform to systematically study and control light-matter interactions in nanoparticle-based optical materials. The generality and potential of this approach are explored by identifying a broadband absorber with a solvent polarity response that allows dynamic tuning of visible light absorption.
DNA 可编程组装与自上而下的光刻相结合，在大面积的金表面上构建离散的、可重构的纳米粒子超晶格结构。具体来说，通过含有“锁定”核酸的寡核苷酸和聚合物孔提供的受限环境来控制具有不同形状和尺寸的单个胶体等离子体纳米粒子的组装，从而产生具有可调排列和独立可控距离的取向结构，这些结构在纳米级和微米级长度尺度上都可以实现。这些结构很难通过其他常见的组装方法来构建，为系统地研究和控制基于纳米粒子的光学材料中的光物质相互作用提供了一个平台。通过识别具有溶剂极性响应的宽带吸收体，该方法探索了其通用性和潜力，该吸收体允许可见光吸收的动态调谐。
