NDLI: Molecule Nanoelectronics

Content Provider	IEEE Xplore Digital Library
Author	Venkataraman, L.
Copyright Year	2008
Description	Author affiliation: Dept. of Appl. Phys. & Center for Electron Transp. in Mol. Nanostruct., Columbia Univ., New York, NY (Venkataraman, L.)
Abstract	We measure the conductance of over 30 amine terminated molecules by breaking Au point-contacts in a molecular solution at room temperature. We find that the variability of the observed conductance for the diamine molecule-Au junctions is much less than the variability for diisonitrile and dithiol-Au junctions. This narrow distribution enables unambiguous conductance measurements of single molecules. For an alkane diamine series with 2-8 carbon atoms in the hydrocarbon chain and for polyphenyl diamine with 1-3 benzene rings, our results show that conductance decreases exponentially with length. For biphenyl diamines with different substituents that alter the phenyl-phenyl dihedral angle, we find that the conductance decreases with increasing twist angle, following a cosine squared dependence. Finally, for a series of substituted benzene diamines, we find that electron donating substituents on the ring, which drive the occupied molecular orbitals up, increase the junction conductance while electron withdrawing substituents have the opposite effect. Thus for this 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.
Starting Page	64
Ending Page	65
File Size	858688
Page Count	2
File Format	PDF
ISBN	9781424416141
ISSN	1524766X
DOI	10.1109/VTSA.2008.4530800
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-04-21
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Nanoelectronics Extraterrestrial measurements Gold Electrons Tunneling Temperature Atomic measurements Hydrocarbons Orbital calculations Ionization
Content Type	Text
Resource Type	Article

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