Abstract
In the past years, laser ablation of a solid target in a liquid environment has been widely used in preparation of nanomaterials and fabrication of nanostructures. There is a large variety of nanomaterials such as metals, metallic alloys, semiconductors, polymers, etc., synthesized using laser ablation in liquids (LAL) [1]. Noble metal nanoparticles have been widely investigated in view of their applications in the fields of photonics, sensing, and nanomedicine. In particular, Ag nanoparticles (NPs) belong to one of the most extensively studied nanomaterials in nanotechnology due to their sensing and biomedical applications. Surface-enhanced Raman scattering (SERS) has showed promise in overcoming the low-sensitivity problems inherent in Raman spectroscopy for detecting and indentifying molecules. Colloidal suspensions of metal NPs, rough metal electrodes, and metal island films are the most common SERS substrates, which enable us to provide enhancement factors of about 10-10 for dye molecules respect to the normal Raman signal of nonadsorbed molecules [2]. In this study, we report the synthesis, surface-enhanced Raman scattering (SERS) and bactericidal effect of silver nanoparticles (NPs) by using LAL. The as-synthesized silver NPs exhibit super SERS sensitivity that can detect the SERS spectra of rhodamine 6G at the concentration as low as 5×10 M and have a enhancement factor with approximately larger than 10 that reaching the single molecule detection requirement.
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