Research Group of
Dr. Robert M. Metzger

Professor of Physical Chemistry

Lab for Molecular Electronics
Department of Chemistry
The University of Alabama
Tuscaloosa, AL35487-0336

Office 210A, Lloyd Hall
Telephone: (205) 348-5952
Fax (205) 348-9104


      If Moore’s “law”, that integrated circuits tend to double in speed and halve in size every 18 months, is to continue, then, at some point in the future, microelectronic circuit components will have to use single molecules, with dimensions of 1-5 nm each, which is known as molecular electronics.  The basic conponent is a molecular diode or rectifier, which shows a very asymmetric current-voltage(I-V) characteristic as a semi-conductor diode does. We have demonstrated the unimolecular electrical rectification in a LB monolayer of zwitterionic hexadecylquinolinium tricyanoquinodimethanide between gold electrodes. The top-gold electrode was deposited using a technique called “cold gold evaporation”. Now, we are working on other potential electrical rectifying molecules using this technique.

Current Graduate Students:

Jeffrey W. Baldwin                             Tao Xu

Walter J. Shumate                             Andrei Honciuc

Research Facilities:
(a) Langmuir-Blodgett films
(b) electrical conductivity measurement (including low temperature) and superconductivity; SQUID magnetometry
(c) STM, AFM, RAIRS, XPS, ellipsometry,
(d)thermo-evaporation, sputtering, photolithography

Selected Publications:
here for extended list of publications)

"Periodic Holes with 10 nm Diameter Produced by Grazing Ar+ Ion Milling of the Barrier Layer in Hexagonally Ordered Nanoporous Alumina", T. Xu, G. Zangari and R. M. Metzger, Nanoletters, 2, 37-41(2001).

"Rectification by a Monolayer of Hexadecylquinolinium Tricyanoquinodimethanide between Gold Electrodes", T. Xu, I. R. Peterson, M. V. Lakshmikantham, and R. M. Metzger, Angew. Chem. Intl. Ed. Engl., 40, 1749-1752 (2001).

Electrical Rectification by a Monolayer of Hexadecylquinolinium Tricyanoquinodimethanide Measured between Macroscopic Gold Electrodes", R. M. Metzger, T. Xu, and I. R. Peterson, J. Phys. Chem. B, 105, 30, 7280-7290 (2001).

"Unimolecular Electrical Rectification in Hexadecylquinolinium Tricyanoquinodimethanide" R. M. Metzger, B. Chen, U. Höpfner, M. V. Lakshmikantham, D. Vuillaume, T. Kawai, X. Wu, H. Tachibana, T. V. Hughes, H. Sakurai, J. W. Baldwin, C. Hosch, M. P. Cava, L. Brehmer, and G. J. Ashwell, J. Am. Chem. Soc. 119, 10455-10466 (1997).    

 Last modified Dec. 2001. Back to UA Chemistry Page