Preparation of surface-enhanced raman scattering-active Au/Al 2O3 colloids by sonoelectrochemical methods

Fu Der Mai, Chung Chin Yu, Yu Chuan Liu, Kuang Hsuan Yang, Ming Yu Juang

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13 Citations (Scopus)

Abstract

As shown in the literature, surface-enhanced Raman scattering (SERS)-active Au or Ag nanoparticle films in agglomerated states on substrates were generally prepared by salting-out the colloidal solutions with NaClO4 or NaCl. In this work, we report a new pathway to prepare SERS-active Au/Al 2O3 colloids by sonoelectrochemical methods. The prepared colloids demonstrate strong SERS effects on substrates without an additional salting-out procedure. The particle size of prepared Au nanoparticles (NPs) coated on Al2O3 NPs is ca. 20 nm in diameter. Experimental results indicate that the synthesized SERS-active Au/Al2O 3 colloids demonstrate a large Raman scattering enhancement for Rhodamine 6G with a detection limit of 2 × 10-10 M, which is lower than most of those shown in the literature based on Au NPs.

Original languageEnglish
Pages (from-to)13660-13666
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number28
DOIs
Publication statusPublished - Jul 21 2011

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

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