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. Author manuscript; available in PMC: 2018 May 9.
Published in final edited form as: Langmuir. 2017 Apr 26;33(18):4407–4413. doi: 10.1021/acs.langmuir.7b00359

Figure 5.

Figure 5

Determination of electron transfer kinetics from a methylene blue-modified, 20-base linear DNA. (A) For this, we immobilized a 20-base linear DNA modified with methylene blue on its distal terminus onto a gold electrode coated with a 6-mercapto-1-hexanol monolayer. We then measured square-wave voltammograms (full line traces) at a frequency of 100 Hz (see the other frequencies in Figure S7) and amplitudes of (B) 25, (C) 50, and (D) 75 mV. When we use k0 = 0.4 ± 0.1 cm s−1 and α = 0.37 ± 0.02 in our numerical model, we find that the resultant simulated voltammograms closely match these experimental voltammograms.