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将银粗糙化的蝶翅三维结构引入到表面增强拉曼散射(surface enhanced Raman scattering,SERS)基材中,提高检测效果。采用绿带翠凤蝶蝶翅作为基板,将纳米银金属颗粒负载其上,合成了经有序粗糙化的表面增强拉曼散射基底。采用场发射扫描电镜及透射电镜分析了有序银粗糙化蝶翅SERS基底的形貌特征。并以罗丹明6G作为探针分子,可检测到浓度低至10~(-14)mol/L的标样溶液,且检测效果好于二维平板SERS基底,经计算得到绿带翠凤蝶SERS基底的增强因子为1.57×10~7。在试验的基础上,结合三维有限时域差分的计算方法(finite difference time domain,FDTD),模拟计算得到绿带翠凤蝶SERS基底的电场强度E分布,其log|E|2的值为3.85,其对激发光的反射率仅为6%。研究表明银粗糙化的蝶翅三维结构,可以使表面的电场强度有显著增强。
The roughened silver wing three-dimensional structure is introduced into the surface enhanced Raman scattering (SERS) substrate to improve the detection effect. Using green tapestry butterfly butterflies as substrate, nano-silver metal particles were loaded on it, and the ordered roughened surface-enhanced Raman scattering substrate was synthesized. Field emission scanning electron microscopy and transmission electron microscopy were used to analyze the morphology of ordered silver roughened SERS substrates. Rhodamine 6G was used as a probe molecule to detect the standard solution with the concentration as low as 10 ~ (-14) mol / L, and the detection effect was better than that of two-dimensional SERS substrate. The basal enhancement factor is 1.57 × 10 ~ 7. Based on the experiment and the finite difference time domain (FDTD) method, the E distribution of electric field intensity of SERS substrate was obtained by simulation. The value of log | E | 2 was 3.85 , Its reflection of the excitation light is only 6%. Studies have shown that silver roughened three-dimensional structure of the butterfly wing, you can make the surface of the electric field intensity significantly enhanced.