Journal
JOURNAL OF MATERIALS SCIENCE
Volume 56, Issue 7, Pages 4700-4715Publisher
SPRINGER
DOI: 10.1007/s10853-020-05577-4
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Funding
- National Key Research and Development Program of China [2016YFB0301402, 2016YFB0402705]
- National Natural Science Foundation of China [51601226, 51874370, 51302173]
- State Key Laboratory of Powder Metallurgy
- Fundamental Research Funds for the Central Universities of Central South University [2018zzts014, 2017gczd024]
- Postgraduate Research and Innovation Project of Central South University, China [1053320170851, 2018zzts403]
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Selective and sensitive detection of dopamine was achieved by a hybrid dopamine electrochemical sensor fabricated through multiple electrochemical anodic polarization treatments, allowing for dopamine detection even in the presence of high levels of interference from ascorbic acid.
Selective detection of dopamine is still a challenge due to the strong interference from ascorbic acid (AA). A hybrid dopamine electrochemical sensor was fabricated by boron-doped diamond (BDD) film co-modified with gold nanoparticles and graphite-coated nickel nanoparticles (Au-C@Ni/BDD). Highly sensitive and selective detection toward dopamine was achieved by multiple electrochemical anodic polarization treatment (EAPT) with relatively mild voltage (+1.6 V vs. Ag/AgCl) on Au-C@Ni/BDD electrode. Specifically, the oxidation peak separation between ascorbic acid and dopamine reached 166 mV, and the limit of detection of dopamine was as low as 0.015 mu M in a linear concentration range of 0.05-100 mu M with the sensitivity up to 1.99 mu A mu M-1 cm(-2) even in the presence of interference of high-level AA. These could be ascribed to the electrocatalytically active sites and functional oxygen-containing groups of the hybrid electrodes produced by the EAPT and the excellent catalytical activity of gold nanoparticles. [GRAPHICS] .
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