采用自封装技术制备的AgNIs/AlO/Ag作为表面增强拉曼散射（SERS）基底。

AgNIs/AlO/Ag as SERS substrates using a self-encapsulation technology.

作者信息

Zhengkun Wang, Jiamin Quan, Can Zhang, Yong Zhu, Jie Zhang

出版信息

Opt Express. 2020 Oct 12;28(21):31993-32001. doi: 10.1364/OE.404196.

Abstract

Using a self-encapsulation technology, we prepared a metal film-coupled nanoisland system (FCN), that is, Ag and AlO film-coupled Ag nanoislands (AgNIs/AlO/Ag) composite SERS (surface-enhanced Raman scattering) substrate, through the anti-wetting of Ag film on the surface of Al film. The thickness of the AlO film can be controlled within the range of 4 nm to 22 nm by tuning the annealing temperature. Three important properties were investigated. Firstly, the structure shows an excellent near-field and far-field enhancement using COMSOL Multiphysics simulation. Secondly, the experimental SERS analytical enhancement factor (AEF) of the AgNIs/AlO/Ag substrate can reach 3.9 × 10, two orders of magnitude larger than that of bare AgNIs. Thirdly, after exposed in air for 90 days, it can keep 55% enhancement capability, while the bare AgNIs can keep 16%.

摘要

我们采用自封装技术，通过铝膜表面银膜的去湿作用，制备了一种金属膜耦合纳米岛系统（FCN），即银与氧化铝膜耦合的银纳米岛（AgNIs/AlO/Ag）复合表面增强拉曼散射（SERS）基底。通过调整退火温度，氧化铝膜的厚度可控制在4纳米至22纳米范围内。研究了三个重要特性。首先，利用COMSOL Multiphysics模拟表明该结构具有优异的近场和远场增强效果。其次，AgNIs/AlO/Ag基底的实验表面增强拉曼散射分析增强因子（AEF）可达3.9×10，比裸AgNIs大两个数量级。第三，在空气中暴露90天后，它能保持55%的增强能力，而裸AgNIs只能保持16%。