氧化铟锡纳米阵列中的协同增强拉曼散射现象研究

Assembly of Indium Tin Oxide Nanoarrays for Synergistically Enhanced Raman Scattering

一些具有表面增强拉曼散射(Surface-enhanced Raman Scattering,SERS)性能的金属氧化物材料近年来被广泛研究,它们具有相较于传统贵金属材料更为优异的信号均匀度、材料稳定性和生物兼容性等。目前金属氧化物SERS的研究瓶颈在于拉曼增强效果一般,需要对其检测灵敏度进行有效提升方可实现日后的广泛应用。因为金属氧化物具有若干种区别于贵金属的材料特征,例如带隙、化学计量比、激子等多个维度的材料特性,所以金属氧化物可以通过调控若干种材料性能以达到协同增强拉曼散射的目的。本文选取氧化铟锡(Indium Tin Oxide,ITO)作为示例来研究重掺杂金属氧化物纳米阵列中的协同增强拉曼散射现象。该体系同时集成了重掺杂半导体材料的SERS性能以及光学干涉腔的特征,协同性地实现了ITO纳米阵列的SERS性能提升。该研究为金属氧化物SERS基底的研究提供了一个很好的案例,在对金属氧化物SERS材料性能进行提升时,需要对金属氧化物中可能产生的干涉现象进行有效利用。

Some metal oxides possessing surface-enhanced Raman scattering(SERS)ability have drawn tremendous attention recently for their good signal uniformity,chemical stability and biocompatibility.However,most of them present deficient Raman enhancement factors which cannot meet the rigorous requirement in SERS applications.It is desirable to develop efficient approaches to promote the SERS performance.The different inherent features of metal oxides compared with noble metals,endow the former abundant possibilities to tailor SERS performance,such as tailoring of bandgap,stoichiometry or excitons.The effective tailoring of several inherent properties of metal oxides simultaneously may contribute synergistically to the overall SERS performance.Therefore,we choose indium tin oxide(ITO)as an example to explore the possibility to integrate its inherent SERS-activity with its optical interference cavity,to further promote the SERS performance.This work demonstrates a synergistical approach to engineer the SERS-active metal oxide substrate,providing a general concept to manage the intrinsic SERS ability of metal oxide together with optical interference effect.