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A Sensor for Dopamine Based on Gold Nanoparticles/Poly(p-aminobenzene sulfonic acid) Modified Glassy Carbon Electrode

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This work described a simple, controllable and green sensor for detection of dopamine (DA) by electropolymerization of p-aminobenzene sulfonic acid (p-ABSA) onto a glass carbon electrode (GCE) which modified with gold nanoparticles (AuNPs). The gold nanoparticles were deposited on the surface of the GCE by electrodeposition, and poly(p-aminobenzene sulfonic acid) film attached onto the gold nanoparticles by electropolymerization, forming an p-ABSA/AuNPs nanocomposite film-modified GCE (p-ABSA/AuNPs/GCE). It was found that this (p-ABSA/AuNPs/GCE) modified electrode showed good electrocatalytic activity toward dopamine (DA) and good specificity for the detection of DA without interference from ascorbic acid or uric acid. Differential pulse voltammetry was used for the electrochemical DA detection. The method of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were used to characterize modified electrodes. Under optimum conditions, the response peak current for the electrochemical sensor exhibited linear over the ranges of 0.1 to 100 μM (r = 0.9991), with a detection limit of 3.5 × 10–8 M (S/N = 3). The proposed method exhibits high sensitivity, good recovery and excellent reproducibility.
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Keywords: DOPAMINE; GLASS CARBON ELECTRODE; GOLD NANOPARTICLES; P-AMINOBENZENE SULFONIC ACID

Document Type: Short Communication

Publication date: June 1, 2015

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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