Abstract
The authors describe a three-dimensional (3D) structure composed of graphene and DNA for use in a voltammetric dopamine (DA) sensor. The material was deposited on a gold electrode, and the enhanced charge-transfer performance and deposition of DNA were confirmed by electrochemical analysis. Atomic force microscopy shows the graphene-DNA composite to have been assembled on the modified gold electrode. The modified gold electrode possesses excellent electrocatalytic activity for determination of DA, best at a working voltage of 0.1 V (vs. SCE). Ascorbic acid does not interfere. Response to DA is linear in the 0.1 to 100 μM concentration range, with a 30 nM detection limit even in the presence of 1.0 mM of ascorbic acid.
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This work was financially supported by the National Natural Science Foundation of China (No. 21475006, 21375005, 21527808).
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Lu, L., Guo, L., Kang, T. et al. A gold electrode modified with a three-dimensional graphene-DNA composite for sensitive voltammetric determination of dopamine. Microchim Acta 184, 2949–2957 (2017). https://doi.org/10.1007/s00604-017-2267-3
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DOI: https://doi.org/10.1007/s00604-017-2267-3