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

作者：Mai Fu Der; Yu Chung Chin; Liu Yu Chuan^*; Yang Kuang Hsuan; Juang Ming Yu

来源：Journal of Physical Chemistry C, 2011, 115(28): 13660-13666.

DOI：10.1021/jp203931r

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 x 10(-10) M, which is lower than most of those shown in the literature based on Au NPs.

• 出版日期2011-7-21