title: Water-soluble conjugated polymer-induced self-assembly of gold nanoparticles and its application to SERS.
abstract: Gold nanochains were prepared by the assembly of citrate-stabilized gold nanospheres induced by cationic conjugated polymers. This assembly method was rapid, and the assembled product was very stable. A longitudinal plasmon resonance band was formed as a result of the coupling of gold nanoparticles and can be tuned from visible to near-infrared by adjusting the polymer/Au molar ratio. The gold nanochains were used as a SERS substrate and gave an enhancement factor of 8.4 x 10 (9), which is approximately 400 times larger than that on the isolated gold nanosphere substrate. The giant SERS enhancement is ascribed to the large electromagnetic fields of coupled gold nanoparticles.
authors: Department of Chemistry, National University of Singapore, Singapore.
authors: Lakshminarayana
authors: L
authors: Polavarapu
authors: Qing-Hua
authors: QH
authors: Xu
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D011108:Polymers / Q000737:chemistry*; D013053:Spectrophotometry; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D011108:Polymers; D014867:Water; D006046:Gold