Detection of dopamine using self-assembled diazoresin/single-walled carbon nanotube modified electrodes

Ultrathin films of diazoresin (DR)/single-walled carbon nanotube (SWNT) were fabricated on thioglycollic acid (TGA) decorated gold (Au) electrodes by the self-assembly method combined with the photocrosslinking technique. The electrochemical behavior of dopamine (DA) at the DR/SWNT modified electrodes was studied using the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. Under the optimal conditions, a linear CV response to DA concentration from 1 μmol/L to 40 μmol/L was observed, and the detection limit of DA was 2.1 × 10−3 μmol/L via the DPV method in the presence of 10 μmol/L of uric acid (UA) or 2.5 × 10−3 μmol/L via the DPV method in the presence of 10 μmol/L of ascorbic acid (AA). Moreover, the modified electrodes exhibited good reproducibility and sensitivity, demonstrating its feasibility for analytical purposes.

Graphical abstractThe self-assembly method combined with the photocrosslinking technique was applied to the preparation of DR/SWNT modified Au electrodes.Figure optionsDownload full-size imageDownload as PowerPoint slide