Plasmonic photo‐assisted electrochemical sensor for detection of trace lead ions based on Au anchored on two‐dimensional g‐C <sub>3</sub> N <sub>4</sub> /graphene nanosheets
Jiayue Hu, Zhi Li, Chunyang Zhai, Jun-Feng Wang, Lixi Zeng, Mingshan Zhu
Abstract
Abstract In this paper, a plasmonic photo‐assisted electrochemical sensor, Au anchored on two‐dimensional (2D) graphitic carbon nitride (g‐C 3 N 4 )/reduced graphene oxide (rGO) nanosheets (Au/g‐C 3 N 4 /rGO), was facile fabricated. The morphology and structure of the composite are characterized by transmission electron microscope, X‐ray photoelectron spectroscopy, X‐ray diffraction and ultraviolet–visible spectrophotometer (UV–Vis). Based on the semiconductor of g‐C 3 N 4 and optical properties of surface plasmon resonance for Au, the as‐prepared Au/g‐C 3 N 4 /rGO showed high sensitivity for the detection of trace lead ion [Pb(II)] by differential pulse anodic stripping voltammetry in the presence of visible light illumination. Under optimized conditions, the limit of detection (signal‐to‐noise ratio ( S / N ) = 3) Pb(II) detection can be low to 0.1 nmol·L −1 . In addition, the interference research and real soil sample detection were measured to confirm the possibility of practical applications.