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Electrochemical Sensing of Dopamine Using Onion-like Carbons and Their Carbon Nanofiber Composites

  • Okoroike C. Ozoemena
  • Leshweni J. ShaiEmail author
  • Tobile Maphumulo
  • Kenneth I. OzoemenaEmail author
Original Research

Abstract

This work describes the electrochemical detection of dopamine in samples (pure raw materials as well as pharmaceutical formulation) using onion-like carbon (OLC) and its carbon nanofiber composites (OLC-CNF). The OLC-CNF and precursor materials (polyacrylonitrile (PAN) fiber and OLC-PAN) were synthesized using electrospinning process. The morphologies of the samples were obtained using scanning electron microscopy (SEM) while surface area and porosity were determined using the Brunauer–Emmett–Teller (BET) analysis. OLC gave the best surface area (279 m2 g−1) and highest pore volume (1.2 cm3 g−1). To determine electrochemical sensing properties, the materials were drop-cast on the glassy carbn electrode (GCE). The electron transfer properties decrease as follows: OLC > OLC-PAN > OLC-CNF > PAN, suggesting that OLC is the most conductive materials. The modified GCE were used as sensors for the dopamine using electrochemical techniques such as cyclic voltammetry (CV), square wave voltammetry (SWV), and electrochemical impedance spectroscopy (EIS). OLC and OLC-CNF gave comparable electrocatalytic activities in terms of sensitivity and limit of detection (OLC 1.23 μM and sensitivity of 0.74 μA/μM, and OLC-CNF 1.42 μM, 0.31 μA/μM). The high performance of OLC is attributed to its advantageous nanoparticulate nature and high conductivity. Both sensors (OLC and OLC-CNF) could be reliably used in the assay of dopamine raw material and its pharmaceutical formulation, dopamine HCl injection (Rotexmedica®). One of the key fndings here is that the incorporation of the CNF into the OLC does not significantly impact on its inherent tensile strain that defines its electrochemical performance.

Graphical Abstract

Onion-like carbon (OLC) and its carbon nanofiber (CNF) composites gave comparable electrocatalysis toward sensitive and selective detection of dopamine.

Keywords

Onion-like carbon Carbon nanofiber Polyacrylonitrile Nanofiber Dopamine Square wave voltammetry Electrochemical impedance spectroscopy 

Notes

Acknowledgments

This work was supported by the Department of Science and Technology (DST) and National Research Foundation (NRF). O.C. Ozoemena is grateful to the DST-NRF for the MTech degree “DST-NRF Innovation and Priority Research Areas scholarship.” We thank Dr. Nicholas Musyoka (CSIR, Pretoria) for assistance and access to their electrospinning facility.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Biomedical Sciences, Faculty of ScienceTshwane University of TechnologyPretoriaSouth Africa
  2. 2.Department of ChemistryUniversity of PretoriaPretoriaSouth Africa
  3. 3.Molecular Sciences Institute, School of ChemistryUniversity of the WitwatersrandJohannesburgSouth Africa

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