Fig. 3: Consecutive conductance–displacement (G–z) measurements for molecular junctions of DNA zipper.
From: Single-molecule junction spontaneously restored by DNA zipper
a Schematic illustration of in-situ hybridization using STM molecular tip. Initial set-point current, 7.5 nA; pull-up distance, 30 nm; tip velocity, 31 nm/s. b Temporal evolution of the dwell length of G–z trace for 10-mer (left) and 90-mer (right) DNA. The dwell length was calculated as the trace length between 0.14 and 0.16 mG0 and between 1.4 and 2.4 mG0 for the 10-mer and 90-mer zipper, respectively. The threshold values for 10-mer and 90-mer DNA were 0.028 and 0.060 nm, respectively, as indicated by dashed lines. c Successive G–z traces, extracted from the area indicated by square in b. d Plausible model for the formation and breakdown of molecular junctions in DNA zipper.
