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Molecular wire candidates inserted into “nonconducting” n -dodecanethiol self-assembled monolayers on Au111 were probed by scanning tunneling microscopy (STM) and microwave frequency alternating current STM at high tunnel junction impedance (100 gigohms) to assess their electrical properties. The inserted conjugated molecules, which were 4, 4′-di (phenylene-ethynylene) benzenethiolate derivatives, formed single molecular wires that extended from the Au111 substrate to about 7 angstroms above and had very high conductivity as compared with that of the alkanethiolate.
Bumm et al. (Fri,) studied this question.