Plasmonic photo-assisted electrochemical sensor for detection of trace lead ions based on Au anchored on two-dimensional g-C_(3)N_(4)/graphene nanosheets

摘要

In this paper,a plasmonic photo-assisted electrochemical sensor,Au anchored on two-dimensional(2 D)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 to0.1 nmol·L^(-1).In addition,the interference research and real soil sample detection were measured to confirm the possibility of practical applications.