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Department of Chemistry and Biochemistry
University of South Carolina
This is an abstract for a talk to be given at the Fifth Foresight Conference on Molecular Nanotechnology.
Synthetic organic routes to precisely defined conjugated macromolecules
(molecular scale wires) will be described using solution and solid phase
approaches. The molecular scale wires are based on poly(phenylene
ethynylene)s and poly(thiophene ethynylene)s and they possess thiol end
groups to function as molecular scale alligator clips. Ordering of these
molecular scale wires on gold surfaces has been studied by ellipsometry,
XPS, and grazing angle IR. Experimental approaches will be described for
isolating some of these single molecules in alkane thiolate self-assembled
monolayers and addressing them with an STM probe. Single molecule
conductance has been measured using a mechanically controllable break
junction. These experiments demonstrate single molecule conductivity and
they are a prelude to the testing of molecular scale devices. Some
potential molecular scale structures that have been synthesized are wires
with tunnel barriers, wires with quantum wells, three terminal systems
which could act as transistors, and four terminal systems that can be
actual logic devices. Scenarios will be outlined wherein a single molecule
could function as a logic device rather than the traditional use of
multiple transistors. The enormous potential and obstacles of molecular
scale electronic architectures will be discussed.
James M. Tour, Lipscomb Professor of Chemistry
Department of Chemistry and Biochemistry, University of South Carolina
Columbia, SC 29208
Phone: 803-777-9517; Fax: 803-777-9521
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