Preparation of L-Cys-Au colloid self-assembled nanoarray electrode based on the microporous aluminium anodic oxide film and its application to the measurement of dopamine

A novel method for fabricating a nanoarray electrode combining the template technique with the self-assembled approach was developed. The glassy carbon electrode was modified with the Au nanoarray using micropores of aluminum anodic film as template. Then, the Au nanoarray electrode was self-assembled with l-cysteine (l-Cys) and gold colloid, respectively. In order to evaluate the electrochemical characteristics of l-Cys-Au colloid self-assembled nanoarray electrode, Fe(CN)63- was chosen as molecule probe and cyclic voltammetry was used. In addition, the functional nanoarray electrode was applied to measuring dopamine (DA). The resulting l-Cys-Au colloid self-assembled nanoarray electrode demonstrated that the linear calibration range extended over three orders of magnitude of DA concentrations (1.0 × 10 ^-9-1.0 × 10 ^-6 mol/L) and the detection limit was 5.0 × 10 ^-10 mol/L.