▎ 摘　　要

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 + 0.0307X(1458) - 0.0267X(1251). (C) 2016 Elsevier Ltd. All rights reserved.