title: Using a photochemical method and chitosan to prepare surface-enhanced Raman scattering-active silver nanoparticles.
abstract: In this paper, we report a new strategy for the preparation of surface-enhanced Raman scattering (SERS)-active silver nanoparticles (Ag NPs), using a photochemical method and the presence of chitosan (Ch). First, Ag substrates were subjected to electrochemical oxidation/reduction cycles (ORCs) in deoxygenated aqueous solutions containing 0.1 M HNO(3) and 1 g L(-1) Ch (pH 6.9, adjusted by adding 1 M NaOH), resulting in Ag(+)-Ch complexes. These substrates were then irradiated with UV light at various wavelengths to yield the SERS-active Ag NPs. A stronger SERS effect was observed on the SERS-active Ag NPs prepared by using UV irradiation at 310 nm. The pH of the solution and the presence of Ch during the preparation process both affected the resulting SERS activities.
authors.affiliation: Department of Materials Science and Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan. khy@mail.vnu.edu.tw
authors.forename: Kuang-Hsuan
authors.initials: KH
authors.lastname: Yang
authors.forename: Chia-Ming
authors.initials: CM
authors.lastname: Chang
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014466:Ultraviolet Rays
chemical_list: D012834:Silver; D048271:Chitosan