Combining self-assembly technology and the thin-film annealing method, annealed Ag nano-islands (Ag NIs) with SiO₂ microsphere (MS) arrays were prepared as surface-enhanced Raman scattering (SERS) substrate in this paper. A “top-binding” model was established to analyze the effect of SiO₂ MS at different annealing temperatures and different Ag film thickness. The corresponding comparative analysis with and without MS templates have been carried on. We simulated the electric field enhancement, coupling enhancement spectrum and the optical focus function of SiO₂ MS. Characterization and experiments showed that the use of a SiO₂ MS array as a dewetting template can well regulate the size and morphology of Ag NIs. Among them, SiO₂ MS-Ag-20 can achieve the most uniform particle size at an annealing temperature of 873.15 K. According to the UV-Vis absorption spectrum, it had an active SERS analytical enhancement factor (AEF) of ∼3.91×10⁵ and good SERS reproducibility (relative standard deviation, RSD = 0.113) for R6G when the wavelength was 532 nm.

中文翻译：

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自组装技术和薄膜退火法制备的带有SiO ₂微球阵列的Ag纳米岛的拉曼增强特性

本文结合自组装技术和薄膜退火方法，制备了带有SiO ₂微球（MS）阵列的退火银纳米岛（Ag NIs）作为表面增强拉曼散射（SERS）衬底。建立了“顶部结合”模型来分析SiO ₂ MS在不同退火温度和不同Ag膜厚度下的影响。已经进行了有和没有MS模板的相应比较分析。我们模拟了SiO ₂ MS的电场增强、耦合增强光谱和光学聚焦函数。表征和实验表明，使用 SiO ₂ MS 阵列作为去湿模板可以很好地调节 Ag ​​NI 的尺寸和形态。其中，SiO₂ MS-Ag-20在873.15 K的退火温度下可以获得最均匀的粒径。根据UV-Vis吸收光谱，它具有~3.91×10 ⁵的活性SERS分析增强因子（AEF）和良好的SERS当波长为 532 nm 时，R6G 的重现性（相对标准偏差，RSD = 0.113）。