A novel sensor of poly (vinyl alcohol) incorporated multi-walled carbon nanotubes for voltammetric determination of Cu (II)

摘要

An electrochemical sensor for the detection of Cu (II) ion is described by using poly (vinyl alcohol) (PVA) and carboxylic multi-walled carbon nanotubes (c-MWNT) modified glassy carbon electrode (GCE) by anodic stripping voltammetry (ASV). PVA/c-MWNT film greatly improves the sensitivity of determining Cu (II). The striping peak currents change linearly with the concentration of Cu (II) from 1.0×10~(-8) to 8.0×10~(-5) mol/L for an accumulation time of 200 s, correlation coefficient r = 0.9980. The detection limit is as low as 5.0×10~(-9) mol/L. The high sensitivity, selectivity, and stability of the PVA/c-MWNT film demonstrated its practical application.