Gilic Martina, Ghobara Mohamed, Reissig Louisa
Institute of Experimental Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
Nanomaterials (Basel). 2023 May 10;13(10):1594. doi: 10.3390/nano13101594.
The discovered light modulation capabilities of diatom silicious valves make them an excellent toolkit for photonic devices and applications. In this work, a reproducible surface-enhanced Raman scattering (SERS) enhancement was achieved with hybrid substrates employing diatom silica valves coated with an ultrathin uniform gold film. Three structurally different hybrid substrates, based on the valves of three dissimilar diatom species, have been compared to elucidate the structural contribution to SERS enhancement. The comparative analysis of obtained results showed that substrates containing cylindrical sp. valves achieved the highest enhancement, up to 14-fold. Numerical analysis based on the frequency domain finite element method was carried out to supplement the experimental results. Our results demonstrate that diatom valves of different shapes can enhance the SERS signal, offering a toolbox for SERS-based sensors, where the magnitude of the enhancement depends on valve geometry and ultrastructure.
硅藻硅质瓣膜所具有的已被发现的光调制能力，使其成为光子器件及应用的理想工具包。在这项工作中，通过使用涂有超薄均匀金膜的硅藻硅质瓣膜的混合基底，实现了可重现的表面增强拉曼散射（SERS）增强。基于三种不同硅藻物种的瓣膜，比较了三种结构不同的混合基底，以阐明结构对SERS增强的贡献。对所得结果的对比分析表明，含有圆柱藻属瓣膜的基底实现了最高达14倍的增强。基于频域有限元法进行了数值分析，以补充实验结果。我们的结果表明，不同形状的硅藻瓣膜能够增强SERS信号，为基于SERS的传感器提供了一个工具包，其中增强的幅度取决于瓣膜的几何形状和超微结构。
