▎ 摘　　要

In this study, silver nanoparticles-doped graphene oxide (AgNPs@GO) nanocomposite was green synthesized using the extract of Curcuma longa as an effective reducing and stabilizing agent.. Characterization of AgNPs and AgNPs@GO were thoroughly examined via several analysis methods. Thereby, the results show the successful formation as well as the uniform distribution of spherical nano-sized silver fragments on the GO surface with an average size of 21.14 +/- ${\pm }$ 3.21 nm. The materials were then tested regarding their optical sensing for H2O2 and Hg2+. In specific, AgNPs@GO indicated a great colorimetric detection towards H2O2 and Hg2+ with a remarkably low detection limit at 0.48 and 0.158 mu M, respectively. Conclusively, AgNPs@GO nanocomposite poses a high potential in application sectors of the colorimetric sensor.