Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-16
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 4 figures
Scientific paper
10.1021/nl062923j
We measure the low bias conductance of a series of substituted benzene diamine molecules while breaking a gold point contact in a solution of the molecules. Transport through these substituted benzenes is by means of nonresonant tunneling or superexchange, with the molecular junction conductance depending on the alignment of the metal Fermi level to the closest molecular level. Electron-donating substituents, which drive the occupied molecular orbitals up, increase the junction conductance, while electron-withdrawing substituents have the opposite effect. Thus for the measured series, conductance varies inversely with the calculated ionization potential of the molecules. These results reveal that the occupied states are closest to the gold Fermi energy, indicating that the tunneling transport through these molecules is analogous to hole tunneling through an insulating film.
Colin Nuckolls Adam C. Whalley
Hybertsen Mark S.
Park Young S.
Steigerwald Michael L.
Venkataraman Latha
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