Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Nanostructures at Surfaces III
O 33.8: Vortrag
Dienstag, 12. März 2013, 12:15–12:30, H45
DNA-Modulated Heterogeneous Nucleation and Growth of Functional Silver Nanoparticles on AgCl Particle Surface — •Guoqing Wang1, Hideyuki Mitomo2, Yasutaka Matsuo2,3, Kenichi Niikura2,3, and Kuniharu Ijiro2,3 — 1Graduate School of Chemical Sciences and Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan — 2Research Institute for Electronic Science, Hokkaido University, N21W10, Sapporo 001-0021, Japan — 3JST-CREST, Sanban-cho 5, Chiyoda-Ku, Tokyo 102-0075, Japan
Photocovnersion of AgX (X = Cl, Br, I) to functional silver nanoparticle (AgNPs) is of both scientific curiosity and technological importance. Here we show that AgCl can be photoconverted to AgNPs within minutes via photoreduction in the presence of DNA. Our mechanistic studies reveal that the heterogeneous nucleation and growth of AgNPs on AgCl correlates well with the thermodynamic explanation in terms of a reduced interfacial energy barrier, and DNA serving as a template plays an essential role in controlling the morphology and size of the AgNPs. The resultant AgNPs are observed to be biofunctionalized, and exhibit photostable luminescence and DNA-specific surface-enhance Raman scattering (SERS) signature, allowing for DNA-directed recognition and dual-modal cell imaging. Furthermore, DNA-encapsulated Ag/AgCl nanostructures can be obtained through a short-term photoreduction. Their uses in plasmonic photocatalysis are demonstrated.