PVP-mediated galvanic replacement growth of AgNPs on copper foil for SERS sensing

[摘要] Herein, the authors present a simple and cost-effective silver nanoparticles (AgNPs)-based surface-enhanced Raman scattering (SERS) sensor based on galvanic displacement reaction using AgNO 3 and copper foil as precursors. With the mediation of polyvinyl pyrrolidone (PVP), AgNPs grow in-situ on the surface of copper foil at room temperature. AgNPs-based SERS sensor was prepared with optimised AgNO 3 concentration of 50 mM, the mass ratio of AgNO 3 to PVP of 2:1 and characterised using scanning electron microscopy and X-ray diffraction. As-fabricated SERS sensor exhibited a high Raman signal enhancement factor of 3.5 × 10 5 in the detection of Rhodamine 6G (R6G). Furthermore, a decent linear relationship for methyl parathion sensing was obtained in the range from 1 × 10 −6 to 1 × 10 −4 M, with an actual detection limit of 1 × 10 −6 M. Recoveries of methyl parathion-spiked lake water samples ranging from 93.64 to 106.16% were obtained, suggesting the feasibility of the SERS sensor. These features demonstrated that the AgNPs-based SERS sensor can potentially be used in sensing a trace amount of chemicals in surface water for environmental protection.

[学科分类] 计算机科学（综合）

[关键词] nanocomposites;biosensors;nanofabrication;scanning electron microscopy;silver;nanosensors;chemical sensors;nanoparticles;X-ray diffraction;surface enhanced Raman scattering;optical sensors;high Raman signal enhancement factor;AgNP-based SERS sensor;copper foil;cost-effective silver nanoparticles;surface-enhanced Raman scattering;galvanic displacement reaction;optimised AgNO3 concentration;PVP-mediated galvanic replacement growth;polyvinyl pyrrolidone;scanning electron microscopy;X-ray diffraction;detection limit;Rhodamine 6G;methyl parathion-spiked lake water samples;environmental protection;temperature 293.0 K to 298.0 K;Ag