The poor time stability of surface-enhanced Raman scattering (SERS) substrates greatly limits their application potential. Although core–shell structures are commonly used to enhance stability, their complex preparation processes, high costs, and susceptibility under acidic or alkaline conditions result in serious disadvantages for practical applications. Here, we propose a new method of external oxygen barrier to improve spectral stability, in which SERS substrates are stored in an oxygen-free environment. Controlled experiments are carried out under air and vacuum. Raman spectrum intensity is measured 11 times within six months for each group. Using the attenuation formula, the Raman spectrum intensity decay results of each SERS substrate over time are obtained. The effectiveness of the external oxygen barrier method is demonstrated through curve fitting using the corresponding function. The substrate spectral attenuation rates of the vacuum group and the argon group within six months are <20%, proving the effectiveness of the external oxygen barrier method.

中文翻译：

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使用外部氧屏障方法提高表面增强拉曼光谱基底时间稳定性

表面增强拉曼散射（SERS）基底的时间稳定性较差，极大地限制了其应用潜力。尽管核壳结构通常用于增强稳定性，但其制备过程复杂、成本高以及在酸性或碱性条件下的敏感性导致实际应用中存在严重缺陷。在这里，我们提出了一种外部氧屏障的新方法来提高光谱稳定性，其中SERS基板被储存在无氧环境中。对照实验在空气和真空下进行。每组在六个月内测量拉曼光谱强度 11 次。利用衰减公式，可以获得每种SERS基底随时间的拉曼光谱强度衰减结果。通过使用相应函数的曲线拟合证明了外部氧气屏障方法的有效性。六个月内真空组和氩气组的基底光谱衰减率<20%，证明了外部阻氧方法的有效性。