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首页> 外文期刊>RSC Advances >Arrayed nanopore silver thin films for surface-enhanced Raman scattering
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Arrayed nanopore silver thin films for surface-enhanced Raman scattering

机译：用于表面增强拉曼散射的排列纳米孔银薄膜

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Active substrates are crucial for surface-enhanced Raman scattering (SERS). Among these substrates, large uniform area arrayed nanoporous silver thin films have been developed as active substrates. Arrayed nanoporous silver thin films with unique anisotropic morphologies and nanoporous structures can be fabricated onto the nanoporous anodic aluminum oxide (AAO) of controlled pore size and interspacing by precisely tuning the sputtering parameters. These thin films preserve locally enhanced electromagnetic fields by exciting the surface plasmon resonance, which is beneficial for SERS. In this study, nanoporous silver thin films were transferred into polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) substrates using our recently invented template-assisted sol–gel phase inverse-imprinting process to form two different nanopore thin films. The as-formed Ag nanoporous thin films on PMMA and PDMS exhibited intensively enhanced SERS signals using Rhodamine 6G (R6G) as the model molecule. The two nanopore thin films exhibited opposite pore size-dependent SERS tendencies, which were elucidated by the different enhancement tendencies of the electric field around pores of different diameters. In particular, the Ag nanoporous thin film on PMMA exhibited an R6G detection limit of as low as 10 ~(?6) mol L ~(?1) , and the SERS enhancement factor (EF) was more than 10 ~(6) . The low detection limit and large EF demonstrated the high sensitivity of the as-prepared SERS substrates for label-free detection of biomolecules. Compared with conventional smooth films, this nanopore structure can facilitate future application in biomolecular sensors, which allows the detection of single molecules via an electronic readout without requirement for amplification or labels.
机译：活性基板对于表面增强拉曼散射（SERS）至关重要。在这些基板中，大型均匀区域阵列纳米多孔银薄膜已作为有源基材开发。通过精确调整溅射参数，可以制造具有独特各向异性形态和纳米多孔结构和纳米多孔结构的纳米多孔结构和纳米多孔结构的纳米多孔阳极铝氧化物（AaO）。这些薄膜通过激发表面等离子体共振来保护局部增强的电磁场，这对SERS有益。在该研究中，使用我们最近发明的模板辅助溶胶 - 凝胶相逆压印方法转移到聚甲基丙烯酸甲酯（PMMA）和聚二甲基硅氧烷（PDMS）底物中转移到聚甲基丙烯酸甲酯（PMMA）和聚二甲基硅氧烷（PDMS）底物中以形成两种不同的纳米孔薄膜。 PMMA和PDMS上的AS形成的Ag纳米孔薄膜使用罗丹明6G（R6G）作为模型分子表现出强烈增强的SERS信号。两种纳米孔薄膜表现出相反的孔径依赖性SERS倾向，其通过不同直径的孔周围的电场的不同增强趋势阐明。特别地，PMMA上的Ag纳米孔薄膜表现出低至10〜（Δ6）摩尔L〜（α1）的R6G检测限，并且SERs增强因子（EF）大于10〜（6）。低检测极限和大型EF证明了用于无标记的生物分子的无标记检测的制备的SERS基材的高灵敏度。与传统的光滑膜相比，该纳米孔结构可以促进生物分子传感器的未来应用，这允许通过电子读出检测单个分子，而不需要放大或标签。

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