ISSN:
0925-4005
Journal Name:
Sensors and Actuators B: Chemical
Volume:
285
Issue:
4
Pages From:
17
To:
23
Date:
الأحد, يناير 6, 2019
Keywords:
Dopamine, Graphene, Differential pulse stripping voltammetry, Electrochemical sensor, Cobalt tetrasulfonate phthalocyanine
Project:
Modified Graphene Nanomaterials for Biomedical Applications
Abstract:
Electrochemical dopamine-sensing surfaces were fabricated by deposition of graphene sheets modified with cobalt tetrasulfonated phthalocyanine on glassy carbon electrodes (CoTSPc/Gr-GC) using differential pulse
amperometry. Differential pulse stripping voltammetry was used to detect dopamine (DA) and the influence of pH value, scan rate, accumulation potential and time as well as dopamine concentration on the performance of
CoTSPc/Gr-GC electrodes was investigated. The modified electrodes were successfully used as sensors for the selective and high sensitive determination of DA in presence of high concentrations of ascorbic acid (AA) and
uric acid (UA) with a detection limit of 0.87 nM over the dynamic linear range of 20 nM to 220 nM.