An ultra-sensitive SERS (surface-enhanced Raman scattering) substrate was fabricated orderly by depositing 360 nm Ag film on the surface of V-shaped AAO (anodized aluminum oxide), utilizing NaOH solution to remove the AAO template, the neat volcano-like Ag arrays substrate (N-V-Ag) was obtained, and then depositing 1.5, 6 and 10 nm Ag film on the surface of the N-V-Ag to obtain the AgNPs decorated volcano-like Ag arrays substrates (AgNPs-V-Ag-1.5, AgNPs-V-Ag-6 and AgNPs-V-Ag-10, respectively). Experimental results indicated that the cavity resonance mode (super-radiant bright modes) and the rim mode as well as “NP mode” (subradiant dark mode) have strong interferences, which results in a significant change in the distribution of the hot spots in the cavity compared with the N-V-Ag. The analytical enhancement factor (AEF) of AgNPs-V-Ag could reach up to 1.5 × 1011, improved by 5 orders of magnitude compared with the N-V-Ag. This novel substrate could obtain extremely low limits of detection (LOD) of 10−13 mol/L (-13 M) for Rhodamine 6G (R6G).

中文翻译：

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AgNPs 装饰火山状 Ag 阵列，用于超灵敏拉曼检测

通过在 V 形 AAO（阳极氧化铝）表面沉积 360 nm Ag 薄膜，利用 NaOH 溶液去除 AAO 模板，有序地制造超灵敏 SERS（表面增强拉曼散射）基板，整洁的火山状获得Ag阵列基板（NV-Ag），然后在NV-Ag表面沉积1.5、6和10nm的Ag薄膜，得到AgNPs装饰的火山状Ag阵列基板（AgNPs-V-Ag-1.5，分别为 AgNPs-V-Ag-6 和 AgNPs-V-Ag-10）。实验结果表明，腔共振模式（超辐射亮模式）和边缘模式以及“NP模式”（亚辐射暗模式）有很强的干扰，导致热点分布发生显着变化。腔与 NV-Ag 相比。AgNPs-V-Ag的分析增强因子（AEF）可达1.5×1011，与NV-Ag相比提高了5个数量级。这种新型底物可以为罗丹明 6G (R6G) 获得 10-13 mol/L (-13 M) 的极低检测限 (LOD)。