Femtosecond laser fabrication of silver nanostructures on glass for surface enhanced Raman spectroscopy.

ABSTRACT: We report on an optimized fabrication protocol for obtaining silver nanoparticles on fused silica substrates via laser photoreduction of a silver salt solution. We find that multiple scans of the laser over the surface leads to a more uniform coverage of densely packed silver nanoparticles of approximately 50 nm diameter on the fused silica surface. Our substrates yield Raman enhancement factors of the order of 10¹¹ of the signal detected from crystal violet. We use a theoretical model based on scanning electron microscope (SEM) images of our substrates to explain our experimental results. We also demonstrate how our technique can be extended to embedding silver nanoparticles in buried microfluidic channels in glass. The in situ laser inscription of silver nanoparticles on a las

SUBMITTER: MacKenzie M 

PROVIDER: S-EPMC6864074 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature