A kind of graphene oxide/silver (GO/Ag) nanocomposites with high Surface enhanced Raman scattering (SERS) activity were fabricated via a facile and green liquid phase reduction method. The synthesized materials were characterized in detail using various microscopic and spectroscopic techniques. In this method, the GO sheets worked as a holder which makes silver nanoparticles (AgNPs) aggregate to a particular morphology, and under a suitable dosage of silver ions, well-dispersed AgNPs on the surface of GO were obtained, which could generate more "hot spots" of SERS. Moreover, SERS technique based on the obtained GO/Ag nanocomposites was used as an effective way to detect l-Theanine. The detection limit was estimated to be as low as 10(-7)M, and a multivariate linear regression model for the concentration of l-Theanine was established. The optimal fitting equation is Y=5.6765+0.0307X1458-0.0267X1251.
Keywords: Graphene oxide; SERS; Silver nanoparticles; l-Theanine.
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