writer：Youju Huang,* Palanisamy Kannan, Lei Zhang, Yun Rong, Liwei Dai, Rongqin Huang and Tao Chen *
keywords：Gold NPs, Ag Nps, Hybrid, SERS Probes
source：期刊
specific source：RSC Advances, 2015, 5, 94849-94854
Issue time：2015年
Bimetallic nanocatalysts often display enhanced physical and chemical properties compared to those of their monometallic counterparts, herein, we introduce a simple method to fabricate an island like array of tiny Ag nanoparticles bounded on triangular Au nanoplates as the surface-enhanced Raman scattering (SERS) substrate. The surface morphology of the synthesized nanoparticles was characterized via field emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM). Rhodamine 6G (R6G) is used as a model analyte to evaluate the performance of the tiny Ag nanoparticles bounded triangular Au nanoplates as a SERS-active substrate and validate the SERS effect. Fabricated SERS substrate is showed drastically enhanced intensity with a SERS enhancement factor as high as 107, which is enough to detect a single molecule, and excellent reproducibility (less than ±5%) of the signal intensity. This is because of the islands like tiny Ag nanoparticles bounded triangular Au nanoplates and its large “hot spots”. This substrate could also be used for label-free immunoassays, biosensing, and nanoscale optical antennas and light sources.