THE SURFACE ENHANCED RAMAN SCATTERING STUDIES OF P- HYDROXYBENZOIC ACID ON SILVER-COATED GLASS

Abstract: In this report, high quality SERS spectrum of p-hydroxybenzoic acid (PHBA) on silver-coated glass was presented, which provides more information than that from the silver aqueous colloids. This shows that the silver-coated glass is a highly SERS-active substrate. Since 1974, SERS was discovered by Fleischman[1]. The preparation of substrate with highly SERS-active has induced great interesting of many researcher [2.3.4.]. In this report, first, the PHBA was dissolved in water, then mixed with Ag hydrosols, after that the mixture was dropped on clean glass to form a coating solid film. And high quality SERS spectrum of PHBA on the silver-coated glass was observed. While water evaporated to keep the film dried. more and more PHBA moleculars and Au nano-particles adsorbed and interacted with each other. After drying, tight adsorption between PHBA moleculars and Au nano-particles occurred, in which greatly enhanced SERS signals were obtained. This mathod avoid the interaction inside the silver aqueous colloids, and can be applied to SERS study of some water-fast compounds. So it is an simple method which worth further investigation. The expriment of this article is based on this substrate facture and traditional preparation [5] of silver aqueous colloids.to investigate the molecule’s adsorption behavior on the silver nanoparticles