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Conductance of a single conjugated polymer as a continuous function of its length

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Lafferentz,  Leif
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Grill,  Leonhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Lafferentz, L., Ample, F., Yu, H., Hecht, S., Joachim, C., & Grill, L. (2009). Conductance of a single conjugated polymer as a continuous function of its length. Science, 323(5918), 1193-1197. doi:10.1126/science.1168255.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-F9E4-D
Abstract
The development of electronic devices at the single-molecule scale requires detailed understanding of charge transport through individual molecular wires. To characterize the electrical conductance, it is necessary to vary the length of a single molecular wire, contacted to two electrodes, in a controlled way. Such studies usually determine the conductance of a certain molecular species with one specific length. We measure the conductance and mechanical characteristics of a single polyfluorene wire by pulling it up from a Au(111) surface with the tip of a scanning tunneling microscope, thus continuously changing its length up to more than 20 nanometers. The conductance curves show not only an exponential decay but also characteristic oscillations as one molecular unit after another is detached from the surface during stretching.