Araújo Andreia, Caro Carlos, Mendes Manuel J, Nunes Daniela, Fortunato Elvira, Franco Ricardo, Águas Hugo, Martins Rodrigo
Nanotechnology. 2014 Oct 17;25(41):415202. doi: 10.1088/0957-4484/25/41/415202. Epub 2014 Sep 26.
This work reports on highly efficient surface enhanced Raman spectroscopy (SERS) constructed on low-cost, fully recyclable and highly reproducible cardboard plates, which are commonly used as disposable packaging material. The active optical component is based on plasmonic silver nanoparticle structures separated from the metal surface of the cardboard by a nanoscale dielectric gap. The SERS response of the silver (Ag) nanoparticles of various shapes and sizes were systematically investigated, and a Raman enhancement factor higher than 106 for rhodamine 6G detection was achieved. The spectral matching of the plasmonic resonance for maximum Raman enhancement with the optimal local electric field enhancement produced by 60 nm-sized Ag NPs predicted by the electromagnetic simulations reinforces the outstanding results achieved. Furthermore, the nanoplasmonic SERS substrate exhibited high reproducibility and stability. The SERS signals showed that the intensity variation was less than 5%, and the SERS performance could be maintained for up to at least 6 months.
这项工作报道了一种基于低成本、完全可回收且高度可重复的纸板构建的高效表面增强拉曼光谱（SERS），这种纸板通常用作一次性包装材料。有源光学组件基于通过纳米级介电间隙与纸板金属表面分离的等离子体银纳米颗粒结构。系统研究了各种形状和尺寸的银（Ag）纳米颗粒的SERS响应，对于罗丹明6G检测实现了高于106的拉曼增强因子。电磁模拟预测的60纳米尺寸的Ag NPs产生的最佳局部电场增强与最大拉曼增强的等离子体共振的光谱匹配，强化了所取得的优异结果。此外，纳米等离子体SERS基底表现出高重现性和稳定性。SERS信号表明强度变化小于5%，并且SERS性能可以保持至少6个月。
