title: Versatile Micropatterning of Plasmonic Nanostructures by Visible Light Induced Electroless Silver Plating on Gold Nanoseeds.
abstract: A versatile fabrication technique for plasmonic silver (Ag) nanostructures that uses visible light exposure for micropatterning and plasmon resonance tuning is presented. The surface of a glass substrate modified with gold (Au) nanoseeds by a thermal dewetting process was used as a Ag plating platform. When a solution containing silver nitrate and sodium citrate was dropped on the Au nanoseeds under visible light exposure, the plasmon-mediated reduction of Ag ions was induced on the Au nanoseeds to form Ag nanostructures. The plasmon resonance spectra of Ag nanostructures were examined by an absorption spectral measurement and a finite-difference time-domain (FDTD) simulation. Some examples of Ag nanostructure patterning were demonstrated by means of light exposure through a photomask, direct writing with a focused laser beam, and the interference between two laser beams. Surface enhanced Raman spectroscopy (SERS) of 4-aminothiophenol (4-ATP) was conducted with fabricated Ag nanostructures.
authors: Department of Applied Physics, Osaka University , 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors: Hiroyuki
authors: H
authors: Yoshikawa
authors: Department of Applied Physics, Osaka University , 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors: Asami
authors: A
authors: Hironou
authors: Department of Applied Physics, Osaka University , 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors: ZhengJun
authors: Z
authors: Shen
authors: Department of Applied Physics, Osaka University , 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors: Eiichi
authors: E
authors: Tamiya
keywords: dewetting; laser direct writing; plasmon-mediated reaction; silver nanostructure; surface enhanced Raman scattering