Fig. 5From: Mediated Electron Transfer at Vertically Aligned Single-Walled Carbon Nanotube Electrodes During Detection of DNA HybridizationImpedance responses during hybridization of probe-DNA attached directly to the gold surface. Time-dependent impedance response of probe-DNA attached to the gold surface in 1 mM [Fe(CN)6]3−/4− + 0.1 M aqueous KCl with a 300 nM cDNA and b 300 nM nCDNA, and c variation of charge-transfer resistance (R ct) against time for cDNA (black squares) and nCDNA (black circles). An upward arrow in a indicates increase of R ct (diameter of semicircles) with time. Solid lines are the fit to the experimental response using an appropriate equivalent circuit, which is shown as an inset of Fig. 4 a Back to article page