Journal
TALANTA
Volume 127, Issue -, Pages 255-261Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2014.03.034
Keywords
Multi-walled carbon nanotubes; Mesocellular graphene foam; Ascorbic acid; Dopamine; Uric acid; Tryptophan
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Funding
- National Natural Science Foundation of China [21175029, 11074053, 31170802]
- Shanghai Leading Academic Discipline Project [B109]
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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 18.28 mu mol L-1, 0.06 mu mol L-1, 0.93 mu mol L-1 and 0.87 mu mol L-1, respectively. Moreover, the modified electrode exhibited excellent stability and reproducibility. (C) 2014 Published by Elsevier B.V.
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