Gating of redox currents at gold nanoelectrodes via DNA hybridization

(Figure Presented) DNA immobilized at the surface of coneshaped gold nanoelectrodes provides a favorable platform for artificial ion channels that can gate the redox reaction of ferricyanide. This effect arises from the nanometer-scale curvature and the enhanced mass transfer at nanoelectrodes. The label-free feature based on this ionchannel effect provides a means to develop label-free electrochemical DNA sensors.