Ag/reduced graphene oxide(RGO) nanocomposites for detection of TNT

The modified Hummers method was employed to generate graphene oxide, and Ag/reduced graphene oxide (RGO) nanocomposites were synthesized at different temperatures by using sodium citrate as the reductant. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were employed to characterize the reaction products. The results indicate that RGO has been synthesized successfully, and Ag particles are distributed evenly on the surface of RGO. The RGO prepared at a reaction temperature of 120℃ shows the best surface-enhanced Raman scattering (SERS) activity. The Ag/RGO nanocomposites modified by 10-5 mol/L 4-aminothiophenol (PATP) successfully detect a 10-5 mol/L 2,4,6-trinitrotoluene (TNT) alcohol solution.