Improving the Surface-Enhanced Raman Scattering Performance of Silver Nanodendritic Substrates with Sprayed-On Graphene-Based Coatings

Improving the Surface-Enhanced Raman Scattering Performance of Silver Nanodendritic Substrates with Sprayed-On Graphene-Based Coatings

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This study examines the improvements in surface-enhanced Raman scattering (SERS) performance achieved when silver nanodendritic structures are coated with various graphene-based materials, namely graphene oxide (GO), reduced graphene oxide (rGO), and graphene nanoplatelets (GNPs).The tests are performed on our unique SERS-active substrates, prepared on the surface Air Freshener of planar microelectrode chips using an electric field-guided Ag nanoparticle assembly process.The graphene-based materials are introduced into the substrate by means of an in-house spray-coating technique.The SERS enhancement effect of each coating is examined as a function of spray nozzle passes (N) and optimal values are identified for each coating type.The enhancements found for GO, rGO, and GNP (6–9 graphene layers thick) coatings are 2.

3 (N = 25), 2.5 (N = 5), and 1.6 (N = 1), respectively.Additionally, in comparison with their uncoated counterparts, substrates coated with rGO (N = 5) are shown to enhance the intensity of the methamphetamine (5 ppb) spectrum in artificial saliva by approximately Military UAV 3-fold.Overall, it can be concluded that the introduction of GO or rGO to the SERS substrate using spray-coating, a simple and also scalable method, can produce substantial SERS performance enhancement.