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http://dx.doi.org/10.5012/bkcs.2014.35.9.2765

Preparation and Characterization of Silica-coated Gold Nanoflowers (AuNFs) with Raman Dye Encoding  

Yoo, Jihye (Department of Chemical & Biochemical Engineering, Gachon University)
Lee, Sang-Wha (Department of Chemical & Biochemical Engineering, Gachon University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.9, 2014 , pp. 2765-2768 More about this Journal
Abstract
Flower-like Au nanoparticles, so-called Au nanoflowers (AuNFs), were synthesized by simply adding ascorbic acid to a gold acid solution in the presence of a chitosan biopolymer. The chitosan-entangled AuNFs exhibited strong plasmon absorption in the near-infrared (NIR) wavelength due to the aggregation of primary Au nanoparticles. The chitosan-entangled AuNFs were preferentially adsorbed by Raman-active 2-chlorothiophenol (CTP) molecules, and the CTP-encoded AuNFs (AuNF-CTPs) were subsequently coated with a thin silica layer by a sol-gel reaction with Si alkoxides. The silica-coated AuNFs (AuNF-CTPs@silica) exhibited the distinct Raman signals of adsorbed CTP molecules, as a potential nanoprobe with surface-enhanced Raman scattering (SERS).
Keywords
Gold nanoflowers; Chitosan; SERS; Silica layer;
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