Analytical Sciences

Multi-walled Carbon Nanotubes/Graphite Nanosheets Modified Glassy Carbon Electrode for the Simultaneous Determination of Acetaminophen and Dopamine

Susu ZHANG, Ping HE, Guangli ZHANG, Wen LEI, and Huichao HE

School of Materials Science and Engineering, Southwest University of Science and Technology, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Mianyang 621010, Sichuan, P. R. China

Graphite nanosheets prepared by thermal expansion and successive sonication were utilized for the construction of a multi-walled carbon nanotubes/graphite nanosheets based amperometric sensing platform to simultaneously determine acetaminophen and dopamine in the presence of ascorbic acid in physiological conditions. The synergistic effect of multi-walled carbon nanotubes and graphite nanosheets catalyzed the electrooxidation of acetaminophen and dopamine, leading to a remarkable potential difference up to 200 mV. The as-prepared modified electrode exhibited linear responses to acetaminophen and dopamine in the concentration ranges of 2.0 × 10⁻⁶ – 2.4 × 10⁻⁴ M (R = 0.999) and 2.0 × 10⁻⁶ – 2.0 × 10⁻⁴ M (R = 0.998), respectively. The detection limits were down to 2.3 × 10⁻⁷ M for acetaminophen and 3.5 × 10⁻⁷ M for dopamine (S/N = 3). Based on the simple preparation and prominent electrochemical properties, the obtained multi-walled carbon nanotubes/graphite nanosheets modified electrode would be a good candidate for the determination of acetaminophen and dopamine without the interference of ascorbic acid.

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