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An electrochemical sensor for simultaneous determination of ascorbic acid, dopamine, uric acid and tryptophan based on MWNTs bridged mesocellular graphene foam nanocomposite

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Volume
127
Identifiers
DOI: 10.1016/j.talanta.2014.03.034
Keywords
  • Multi-Walled Carbon Nanotubes
  • Mesocellular Graphene Foam
  • Ascorbic Acid
  • Dopamine
  • Uric Acid
  • Tryptophan

Abstract

Abstract A multi-walled carbon nanotubes (MWNTs) bridged mesocellular graphene foam (MGF) nanocomposite (MWNTs/MGF) modified glassy carbon electrode was fabricated and successfully used for simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA) and tryptophan (TRP). Comparing with pure MGF, MWNTs or MWNTs/GS (graphene sheets), MWNTs/MGF displayed higher catalytic activity and selectivity toward the oxidation of AA, DA, UA and TRP. Under the optimal conditions, MWCNs/MGF/GCE can simultaneously detect AA, DA, UA and TRP with high selectivity and sensitivity. The detection limits were 18.28µmolL−1, 0.06µmolL−1, 0.93µmolL−1 and 0.87µmolL−1, respectively. Moreover, the modified electrode exhibited excellent stability and reproducibility.

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