In Situ Scanning Tunneling Microscopy of DNA-modified Gold
Surfaces: Bias and Mismatch Dependence
Donato M. Ceres and Jacqueline K. Barton*
Division of Chemistry and Chemical Engineering,
California Institute of Technology, Pasadena, CA 91125
Supporting Information:
Figure S1
(next page): Series of images of a sample containing 75% PM DNA at
different surface potentials. Each image has been recorded after 3 min in order to attain
equilibrium conditions. Tunneling current: 50 pA, potentials vs Ag wire.
By following the surface changes from –400 mV to + 400 mV and vice versa, one can notice
the hysterisis and reversibility, where the underlying gold surface appears and disappears at
different potentials.
Figure S1