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. 2020 Sep 7;6:90. doi: 10.1038/s41378-020-00184-4

Fig. 4. Accumulation-time- and scan-rate-dependent detection of 5-HT at Au-CNT membrane electrodes.

Fig. 4

a, b Accumulation-time-dependence of 5-HT detection for (a) 2 µL and (b) 12.5 µL of CNT coatings of Au membrane electrodes. 5-HT concentrations measured in (a) include 1, 5, and 10 µM (n = 3 cycles per electrode), while (b) corresponds to 5 µM (n = 2 cycles per two electrodes). Inset: CV curves measured over increasing accumulation times, indicated by the arrow. c Scan-rate dependence of the Au-CNT (2 µL) membrane electrode measuring 500 nM 5-HT using a 20-min accumulation time between CV cycles. The scan rate was 10, 20, 50, 100, 150, 200, and 250 mV/s (a–g). d Ipa data are plotted against the scan rate and fit with a line (n = 2 cycles per measurement)