手性等离激元纳米结构制备及其应用

Fabrication and Application of Chiral Plasmonic Nanostructures

手性是自然界物质普遍存在的特征.手性等离激元纳米结构因其优异的光学活性近年受到业界广泛关注.介绍了手性的基本概念和表征方法,综述了3种常用的产生等离激元圆二色响应的纳米结构及其制备方法,总结了其在多方面的应用.纳米制造技术的发展促进了复杂的手性等离激元纳米结构“自上而下”的合成,与此相对应,手性模板和手性分子诱导的手性转移,则为手性纳米结构“自下而上”的湿化学合成提供了多种可行性.具有手性光学响应的等离激元纳米结构主要有3种类型.利用手性分子和非手性等离激元纳米颗粒之间的偶极—偶极相互作用可诱导PCD,但手性响应通常较弱.具有手性形状的单个纳米结构及非手性等离激元纳米颗粒构成的手性组装结构则可产生强烈的手性光学响应.手性等离激元纳米结构在手性光学器件、手性物质检测、手性催化和生物医学等方面展现了广阔的应用前景.

Chirality is a universal feature of natural substances.Chiral plasmonic nanostructures have attracted much attention in recent years because of their excellent optical activity,and have injected new vitality into the traditional research field of molecular chirality.In this paper,the basic concepts and characterization methods of chirality were introduced firstly.Then,three kinds of nanostructures which could produce plasmonic circular dichroism(PCD)response and their preparation methods were reviewed.Finally,their applications in many aspects were summarized.The development of nanotechnology promoted the"top-down"synthesis of complex chiral plasmonic nanostructures.Relatively,chiral transfer induced from chiral templates and chiral molecules provided a variety of possibilities for the"bottom-up"wet chemical synthesis of chiral nanostructures.There were three types of plasmonic nanostructures with chiral optical response.PCD could be induced by the dipole-dipole interaction between chiral molecules and achiral plasmonic nanoparticles,but the chiral responses were usually weak.Distinct nanoparticles with chiral shapes and chiral assembled nanostructures with achiral plasmonic nanoparticles could produce strong chiral optical response.Chiral plasmonic nanostructures have broad application prospects in chiral optical devices,chiral detection,chiral catalysis and biological therapy.