▎ 摘　　要

A three-dimensional (3D) graphene hydrogel covered by uniform silver nanoparticles as an effective substrate for surface-enhanced Raman scattering application was fabricated by facile ethylenediamine-induced self-assembly method. The anchor of silver nanoparticles endows the enhanced Raman spectroscopy with the sensitivity and multiplex requirements for the tellurium quick detection using the robust graphene-based monoliths. The porous structure offers essential channels and space for Te(IV) access. After exposure to Te(IV), the distinguished peak of Te-O at 584.9 cm(-1), which was enhanced significantly and kept constant over a wide range of pH, was selected as the indicative of Te(IV) level. At the optimal pH, the concentration dependent surface-enhanced Raman spectroscopy shows that the detection limit was as low as 100 nM.