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. 2017 Mar 3;7:43181. doi: 10.1038/srep43181

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Differential pulse voltammograms of (a) MWCNT/Fe₃O₄/2,3-Nc and (c) MWCNT/Fe₃O₄/29H,31H-Pc modified electrodes in pH 7.2 PBS containing different concentrations of DA (3.27, 6.3, 9.11, 11.7, 14.2, 16.5, 18.6, 20.6, 22.5 and 24.3 μM). (b,d) Are their respective plots of peak current vs. DA concentration.