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. Author manuscript; available in PMC: 2011 Apr 20.
Published in final edited form as: Acc Chem Res. 2010 Apr 20;43(4):496–505. doi: 10.1021/ar900165x

Figure 3.

Figure 3

The signal gain of E-DNA sensors is a function of the density with which the probe DNAs are packed onto the electrode surface.53 Specifically, signaling improves with increasing probe density, presumably because crowding between neighboring probe-target duplexes minimizes electron transfer from the bound state, resulting in increased signal change upon hybridization.