Preparation of Surface-Enhanced Raman Scattering-Active Au/Al2O3 Colloids by Sonoelectrochemical Methods

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/Al2O3 collo...

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Veröffentlicht in:Journal of physical chemistry. C 2011-07, Vol.115 (28), p.13660-13666
Hauptverfasser: Mai, Fu-Der, Yu, Chung-Chin, Liu, Yu-Chuan, Yang, Kuang-Hsuan, Juang, Ming-Yu
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Sprache:eng
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Zusammenfassung: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/Al2O3 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/Al2O3 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.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp203931r