▎ 摘　　要

A promising electrochemical sensing platform based on imprinting chitosan (CS) nanocomposites integrating multi-walled carbon nanotubes (MWCNTs)/graphene (GR)/gold nanoparticles (AuNPs)/Nafion was developed for the sensitive and selective detection of Pb2+. The platform was constructedviadrop coating and electrodeposition methods and characterized by using cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry. Under the optimized conditions, the proposed sensor showed good sensitive determination of Pb(2+)in the range of 1.0 x 10(-9)-5.0 x 10(-5)mol L(-1)with a detection limit of 2.83 x 10(-10)mol L-1. In the presence of interfering metal ions, the fabricated sensor could selectively detect Pb2+. Meanwhile, the imprinted sensor exhibited high repeatability, good reproducibility and stability. The successful detection of Pb(2+)in water and milk samples suggested its potential application for monitoring Pb(2+)in complex water systems for environmental protection and food safety applications.