Bryche Jean-François, Vega Marlo, Tempez Agnès, Brulé Thibault, Carlier Thomas, Moreau Julien, Chaigneau Marc, Charette Paul G, Canva Michael
Laboratoire Nanotechnologies Nanosystèmes (LN2-IRL 3463)-CNRS, Université de Sherbrooke, 3000 Boulevard de l'Université, Sherbrooke, QC J1K OA5, Canada.
Institut Interdisciplinaire d'Innovation Technologique (3IT), 3000 Boulevard de l'Université, Sherbrooke, QC J1K OA5, Canada.
Nanomaterials (Basel). 2022 Oct 13;12(20):3586. doi: 10.3390/nano12203586.
This work demonstrates the enhancement in plasmonic sensing efficacy resulting from spatially-localized functionalization on nanostructured surfaces, whereby probe molecules are concentrated in areas of high field concentration. Comparison between SERS measurements on nanostructured surfaces (arrays of nanodisks 110 and 220 nm in diameter) with homogeneous and spatially-localized functionalization with thiophenol demonstrates that the Raman signal originates mainly from areas with high field concentration. TERS measurements with 10 nm spatial resolution confirm the field distribution profiles predicted by the numerical modeling. Though this enhancement in plasmonic sensing efficacy is demonstrated with SERS, results apply equally well to any type of optical/plasmonic sensing on functionalized surfaces with nanostructuring.
这项工作展示了纳米结构表面上空间局部功能化所带来的表面等离子体传感效率的提高，即探针分子集中在高场强区域。对具有均匀和空间局部功能化的纳米结构表面（直径为110和220 nm的纳米盘阵列）进行的表面增强拉曼光谱（SERS）测量之间的比较表明，拉曼信号主要源自高场强区域。具有10 nm空间分辨率的针尖增强拉曼光谱（TERS）测量证实了数值模拟所预测的场分布轮廓。虽然这种表面等离子体传感效率的提高是通过SERS来证明的，但结果同样适用于功能化纳米结构表面上的任何类型的光学/表面等离子体传感。
