selective nanosensing of copper (ii) ion using l-lysine functionalized gold cysteamine self-assembled monolayer

fabrication of a cysteamine (ca) self-assembled monolayer (sam) modified gold electrode insitufunctionalized with l-lysine (lys) is presented and described. the fabricated electrode was used forhighly selective and sensitive accumulation and the determination of copper ions (cu2+) in a nanomolarconcentration. techniques like cyclic voltammetry (cv) and electrochemical impedance spectroscopy (eis)with an external redox probe (p-benzoquinone) were used to investigate the layer-by-layer self assemblymodification on a gold electrode, monolayer structure and the ion permeation through it. the differentialpulse voltammetric (dpv) method was used for determination of cu2+. the results indicated that dpv peakscurrents have a linear relationship with pcu in the concentration range of 1.0×10-12 - 1×10-6 m, with acorrelation coefficient of 0.9982. the detection limit could be estimated 1.2×10-13 m according to the iupacrecommendation (3σ).