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. 2017 Oct 3;17(10):2267. doi: 10.3390/s17102267

Figure 5.

Figure 5

Cyclic voltammograms performed in 2 mM ferricyanide/ferrocyanide (Fe(CN)63−/Fe(CN)64−), prepared in 100 mM potassium chloride, at a scan rate of 0.05 V/s, using: (A) bare (green solid line) and CB-modified (green dashed line) SPE onto paper towel; (B) bare (red solid line) and CB-modified (red dashed line) SPE onto waxed paper; (C) bare (black solid line) and CB-modified (black dashed line) SPE onto Parafilm M®. Complex plane impedance plots at open circuit potential using a 2 mM ferricyanide/ferrocyanide in 100 mM potassium chloride for: (D) bare (green solid line) and CB-modified (green dashed line) SPE onto paper towel; (E) bare (red solid line) and CB-modified (red dashed line) SPE onto waxed paper; (F) bare (black solid line) and CB-modified (black dashed line) SPE onto Parafilm M®. Insets of Figure 5D–F highlight the complex plane impedance plot for CB-SPE.