Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China.
Biosensors (Basel). 2024 Feb 5;14(2):88. doi: 10.3390/bios14020088.
We report a three-dimensional (3D) SERS substrate consisting of a silver nanoparticle (AgNP) coating on the skeleton-fiber surfaces of a polytetrafluoroethylene (PTFE) membrane. Simple thermal evaporation was employed to deposit Ag onto the PTFE membrane to produce grape-shaped AgNPs. The 3D-distributed AgNPs exhibit not only strong localized surface plasmon resonance (LSPR) but also strong hydrophobic performance. High-density hotspots via silver nano-grape structures and nanogaps, the large 3D interaction volume, and the large total surface area, in combination with the hydrophobic enrichment of the specimen, facilitate high-sensitivity sensing performance of such a SERS substrate for the direct detection of low-concentration molecules in water. An enhancement factor of up to 1.97 × 10 was achieved in the direct detection of R6G molecules in water with a concentration of 10 mol/L. The lowest detection limit of 100 ppt was reached in the detection of melamine in water. Such a SERS sensor may have potential applications in food-safety control, environmental water pollution monitoring, and biomedical analysis.
我们报告了一种由聚四氟乙烯（PTFE）膜骨架纤维表面上的银纳米粒子（AgNP）涂层组成的三维（3D）SERS 基底。简单的热蒸发被用来将 Ag 沉积到 PTFE 膜上，以产生葡萄状 AgNP。3D 分布的 AgNP 不仅表现出强的局域表面等离子体共振（LSPR），而且具有强的疏水性。高密度热点通过银纳米葡萄结构和纳米间隙、大的 3D 相互作用体积和大的总表面积，结合标本的疏水性富集，有利于这种 SERS 基底对水中低浓度分子的直接检测具有高灵敏度的传感性能。在直接检测水中浓度为 10mol/L 的 R6G 分子时，实现了高达 1.97×10 的增强因子。在水中检测三聚氰胺的最低检测限达到了 100ppt。这种 SERS 传感器在食品安全控制、环境水污染监测和生物医学分析等领域可能具有潜在的应用。
