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Organic Molecules in an Electrical Circuit: An Afm Study of a Negative-Differential-Resistance Molecule

Published online by Cambridge University Press:  01 February 2011

Ganesh K. Ramachandran ,
Adam M. Rawlett ,
Theresa J. Hopson ,
Larry A. Nagahara ,
Raymond K. Tsui  and
Stuart M. Lindsay
Ganesh K. Ramachandran
Affiliation:
Department of Physics and Astronomy, Arizona State University, Tempe AZ 85287 e-mail- [email protected]
Adam M. Rawlett
Affiliation:
Physical Sciences Research Laboratories, Motorola Labs, 7700 S. River Pkwy, Tempe AZ 85284
Theresa J. Hopson
Affiliation:
Physical Sciences Research Laboratories, Motorola Labs, 7700 S. River Pkwy, Tempe AZ 85284
Larry A. Nagahara
Affiliation:
Physical Sciences Research Laboratories, Motorola Labs, 7700 S. River Pkwy, Tempe AZ 85284
Raymond K. Tsui
Affiliation:
Physical Sciences Research Laboratories, Motorola Labs, 7700 S. River Pkwy, Tempe AZ 85284
Stuart M. Lindsay
Affiliation:
Department of Physics and Astronomy, Arizona State University, Tempe AZ 85287
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Abstract

2,5-di(phenylethynyl)-4‘-4“-dithiolate-1-nitrobenzene has been shown to exhibit negative differential resistance (NDR) and spontaneous switching when inserted into inert molecular monolayers between metal contacts. We have used conducting atomic force microscopy to measure the electronic properties of individual dithiolated molecules 2,5-di(phenylethynyl)-4“ 4‘“dithiolate-1-nitrobenzene and 2,5-di(phenylethynyl)-4“4‘“thioacetyl-benzene inserted into an alkanethiol monolayer and chemically bonded to gold nano-contacts to form a covalentlyconnected molecular circuit (bonded contacts). The data show qualitative agreement with previously published results for similar molecules deposited in a nanopore containing several hundred molecules, allowing us to make the important conclusion that the measured negative differential resistance (NDR) is native to the molecule and not an intermolecular phenomenon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 728: Symposium S – Functional Nanostructured Materials through Multiscale Assembly and Novel Patterning Techniques , 2002 , S10.1
Copyright
Copyright © Materials Research Society 2002

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