基于各向异性修饰的金纳米棒大规模有序阵列制备及其表面增强拉曼散射性能研究

Gold Nanorods self-assembly structure as an atrractive plasmonic material has a wide range applications across optical waveguide, sensors and surface-enhanced Raman scattering (SERS) . But limited by present self-assembly technology the assembled structure shows a short range ordering (micrometer scale) and long range disordering (millimeters scale, as known as device-scale). The disordered structure greatly lowered the stability and reliability of device performance. The research of fabricate gold nanorods into large scale ordered arrays is a foundamental study of developing optoelectronic device, not only help in promoting plasmonic materials study but also improve SERS technique applications in inspection and quarantine, early cancer diagnosis and biomedical research. This project plans to use step-by-step modification of gold Nanorods at end and side wall respectively, by taking advantage of the intrinsic ligand reactivity difference to make anisotropic modified gold Nanorods, and improve the selectivity of relative orientation during self-assembly. Based on this study we plan to explore the relationship of nano-structure and macro-characteristics which may help in the development of novel optoelectronic device.

作为近年来备受关注的表面等离激元材料，金纳米棒自组装结构在光波导、传感、表面增强拉曼散射（SERS）等领域有广泛的应用。但受现有自组装技术的局限，金纳米棒阵列多表现为短程有序（微米级）而长程无序（毫米级），无序结构极大的影响了器件光电性能的稳定性与可靠度。探索金纳米棒大规模有序阵列的制备方法是开发相应光电器件的基础工作，不仅有助于拓展表面等离激元纳米材料的研究，还能推动SERS技术在检验检疫、癌症早期诊断、生物医学研究中的应用。本项目计划借助分步修饰的方式，利用金纳米棒端基和侧壁所具有的天然表面配体反应活性差异对金纳米棒进行各向异性修饰，增强组装取向选择性，制备大规模金纳米棒有序阵列。在此基础上探索微观纳米结构同宏观集合特性间的关系，为发展新型纳米光电器件提供实验平台和理论基础。