title: Br(-)-induced facile fabrication of spongelike gold/amino acid nanocomposites and their applications in surface-enhanced Raman scattering.
abstract: We report a facile method for the fabrication of spongelike gold/amino acid nanocomposites by the addition of NaBr to glutamic acid-stabilized gold nanoparticles (GNPs) at room temperature. The gold/glutamic acid (Glu) nanocomposite is characterized by TEM, SEM, UV-vis spectroscopy, and XRD measurements. The results suggest that the three-dimensional spongelike gold/Glu nanocomposites with mean diameter of 50 nm are formed via the nanospheres fusing into one another. The driving force for the fabrication of spongelike gold/amino acid nanocomposites is the van der Waals attractive forces of Br(-) partially coated GNPs. Furthermore, the obtained spongelike gold nanocomposites can be used as surface-enhanced Raman scattering (SERS) substrates with high SERS activity and stability for detecting Rhodamine 6G (R6G) molecules. Hence, NaBr-mediated preparation of SERS substrates described in this work has potential applications in chemical and biological analysis as well as medical detection.
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Lili
authors.initials: L
authors.lastname: Liu
authors.forename: Rong
authors.initials: R
authors.lastname: Guo
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008962:Models, Theoretical; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: D000596:Amino Acids; D006046:Gold