纳米颗粒有序模板气-液界面自组装及其刻蚀技术、SERS应用

Colloidal lithography has disadvantages of lower resolution and lower nanostructure unit distribution density, in order to resolve this problem, a nanopartilce lithography based on periodic nanoparticle arrangements as templates or masks is proposed. Combining with reacitve ion etching or chemical etching, periodic nanostructured arrays of nanopore and nanorod with high resolution and high nanostructured unit distribution density could be achieved. The periodicity of nanostructured arrays can be tuned from 10 to 100 nm. We also will reveal the mechanism of self-assembling route on the air-liquid interface and investigate the interface contolling in the process. Further, we will systematically study the plasmonic properties of nanostructured arrays with different structure parameters and their applications in SERS to detect the organic molecules with weak interaction with substrates, in oder to reveal the synergistic and coupling effect in enchanced fields between neighboring nanostructure units and relationship with SERS. The motivation of this poject is developing a new strategy to fabricate the ordered nanostructured arrays with high resolution and high distribution density of nanostructure unit as well as the new route to tune the morphology and structures of nanostructured arrays, in order to suppy a way to realize their application in future and offer a new idea to use them as a SERS active substrate to detect the organic molecules with weak interaction with substrates.

本项目针对单层胶体晶体模板技术的低分辨、纳米单元低分布密度的不足和缺点，提出基于有序排列的纳米颗粒作为掩膜或者模板的纳米颗粒刻蚀策略，结合反应离子刻蚀和湿法刻蚀的方法，合成的高分辨率、高分布密度的纳米结构（纳米孔、纳米棒）阵列，合成表面形态均一有序纳米结构阵列，实现阵列周期的10-100 nm的大范围调控；揭示大面积、有序排列纳米颗粒模板的气-液组装方法，探索不同纳米颗粒模板组装的界面调节过程；系统研究不同结构参数纳米结构阵列表面等离子激元共振特性和对弱相互作用分子的SERS效应，探寻阵列结构参数及结构中纳米结构单元的协同、耦合效应与SERS的关系及影响机制等。旨在发展简便实用的高分辨率、高分布密度的纳米结构阵列的合成新技术和结构形态调控新方法，为阵列的实用化提供近期可实现的途径，为其作为SERS活性基底探测弱相互作用分子提供设计思想。本项目工作的开展，不仅具有学术价值，而且有重要的意义。

本项目针对现有单层胶体晶体模板技术中存在的纳米单元低分布密度、低分辨等不足，在尺寸、形貌可控的单分散球形纳米颗粒制备的基础之上，发展了一种简便实用的大面积平方厘米级、单层有序纳米颗粒的气-液界面自组装技术，并结合反应离子刻蚀的方法，提出了基于有序排列的纳米颗粒作为掩膜或者模板的纳米颗粒刻蚀策略，合成了高分布密度的纳米结构阵列，并实现了阵列周期大范围调控，显著提高了其分辨率；进一步，深入揭示了大面积平方厘米级、单层有序纳米颗粒模板的气-液界面自组装方法，探索了不同纳米颗粒模板组装的界面调节参数与调控过程；研究了不同结构参数纳米结构阵列表面等离子激元共振特性及其SERS效应，探寻阵列结构参数及结构中纳米结构单元的协同、耦合效应与SERS的关系及影响机制等。同时，基于上述的单分散纳米颗粒，还开展了相关等离激元新材料自组装和光学性能的研究。本项目旨在发展简便实用的高分辨率、高分布密度的纳米结构阵列的合成新技术和结构形态调控新方法，为阵列的实用化提供近期可实现的途径，为其作为SERS活性基底探提供设计思想。