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À propos de : Changes in the Electronic Properties of a Molecule When It Is Wired into a Circuit        

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  • Changes in the Electronic Properties of a Molecule When It Is Wired into a Circuit
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  • Molecular electronic devices require at least two electrical contacts to one (or more) molecule(s). Singlemolecules are reliably probed by bonding one end to a gold substrate and the other end to a gold nanocrystal.The circuit is completed with a gold-coated atomic force microscope probe. Measurements of the decay ofelectronic current with the length of n-alkanedithiol molecules in these single-molecule nanojunctions arereported as a function of the applied bias. The value of the decay constant near zero bias was obtained frommeasurements in the ohmic region of the current−voltage curves. The electron tunneling decay rate issignificantly smaller (βN = 0.57 ± 0.03) than observed for molecules bonded at just one end (βN ≈ 1), andit falls to even smaller values as the applied bias is increased. Both these effects are quantitatively accountedfor by a large shift in molecular levels caused by the attachment of wires at each end.
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