title: Light-controlled synthesis of gold nanoparticles using a rigid, photoresponsive surfactant.
abstract: We report a new strategy for shape control over the synthesis of gold nanoparticles (AuNPs) by using a photoresponsive surfactant based on a modified seed growth method. Owing to photoresponsive properties of the azo group, the designed surfactant, N(1),N(3),N(5)-tris[(4'-azobenzene-4-sulphonic acid)phenyl]benzene-1,3,5-tricarboxamide, exhibits a distinctive molecular configuration under light leading to different growth processes of AuNPs. As a result, the blackberry-like, spherical AuNPs and multilayered Au plates were successfully prepared in high yield under visible and UV light. The size and morphological control of Au nanocrystals are described and the synthesized Au nanocrystals are evaluated for SERS applications.
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, 637457, Singapore.
authors.forename: Youju
authors.initials: Y
authors.lastname: Huang
authors.forename: Dong-Hwan
authors.initials: DH
authors.lastname: Kim
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D001549:Benzamides / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008968:Molecular Conformation; D010316:Particle Size; D055668:Photochemical Processes; D013059:Spectrum Analysis, Raman; D013451:Sulfonic Acids / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D001549:Benzamides; D013451:Sulfonic Acids; D013501:Surface-Active Agents; C558700:benzene-1,3,5-tricarboxamide; D006046:Gold