Organic-inorganic-hybrid-enhancement Electrochemical Sensor for Determination of Cu (II) in River Water

A dual strategy that the L-cysteine self-assembling on three-dimensional network of organic-hybrid-materials realized by successive interaction of Au-S bond is employed to construct as the amplified electrochemical sensor for determination Cu (II). Specifically, the sensor combined a rigid three-dimension inorganic net which provides a higher interfacial area as well as faster adsorption of ions. Accordingly, surface and interfacial-dominated electro-catalysis reactivity is used as an ideal test-bed to verify the reliability of electrochemical sensor that reveal enhancement sensitiveness and selectivity, low detection limit, and stability over a long period of time. Time-dependent density functional theory (TD-DFT) were used to calculating the all complexes energies at the B3LYP/LANL2DZ level associated with the polarized continuum model (PCM). The result of calculation indicates that the binding strength of Cu (II), Cd (II), As (III), Hg (II) with L-cysteine are decrease successively, and this is in well agreement with experimental results. This work not only achieves an unprecedented understanding to L-cysteine/Au/TiO2/GCE sensor but also provides a new perspective for application in detection of Cu (II) in real river waters.