Fig. 3

a Two sets of eight Au contacts with interspacing 20 nm are shown. DNA molecule is placed on one set of these electrical Au-contacts. The other set of Au-contacts connect a standard material. b shows image of fluorescent microscope due to point-contacts before pipetting Epicenter-solution. c Shows the same image after pipetting that solution. The thiol contact points on DNA serve to main jobs: (1) they carry out good metallic-DNA contacts and (2) they fix the molecule through eight fixing points which enable constant effective surface area between the metal and DNA d for I-V-L measurements at T = 298 K, we put DC-potential polarization between the points 10, 15, and we get the corresponding DC-currents from points: 0 and 2, 0 and 3, 0 and 4, and 0 and 5 for lengths 40, 60, 80, and 100 nm, respectively (Fig. 3c). While for I-V-T measurements at L = 60 nm, we put DC-potential polarization between the points 10 and 15, and we get the corresponding DC-current from points: 0 and 5. For AC-measurements at constant temperature (at T = 298 K), we put AC-leads of Solartron between the points: 0 and 2, 0 and 3, 0 and 4, and 0 and 5 for lengths 40, 60, 80, and 100 nm, respectively. While for AC-measurements at constant length (at L = 60 nm), we put AC-leads of Solartron between the points: 0 and 3 for all temperatures. We repeat these same experimental details on a standard material to have some dimension information about the effective surface area between the metal and standard sample which gives the effective surface area between the metal and DNA. The thiol contact points on DNA serve to main jobs: (1) they carry out good metallic-DNA contacts and (2) they fix the molecule through eight fixing points which enable constant effective surface area between the metal and DNA