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Conductance Microscopy for Electric Conduction Study of Bio-Inspired Hybrid Nanostructures under Ambient Conditions

Published online by Cambridge University Press:  11 February 2011

Wahyu Setyawan
Affiliation:
Physics, Center for Material Research and Technology, and Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306–4351, U.S.A.
Saleem Rao
Affiliation:
Physics, Center for Material Research and Technology, and Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306–4351, U.S.A.
Seunghun Hong
Affiliation:
Physics, Center for Material Research and Technology, and Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306–4351, U.S.A.
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Abstract

Electrical conductance of single stranded DNA (5′-TTT TTT TTT T/3 Thio MC3-D/-3′) monolayer patterns on Au surface is compared with those of various organic molecular patterns via the conductance microscope (CM) technique that allows one to take nanoscale conductance images utilizing a conducting AFM tip in contact mode AFM. In the experiment, reference molecules and ssDNA are patterned on the same substrate via direct deposition methods such as dip-pen nanolithography and microcontact printing. Then, conductance microscope image is recorded revealing the relative conductivity of ssDNA patterns relative to various reference molecules. 16-mercaptohexadecanoic acid and 2-mercaptobenzimidazole patterns are found conducting better than the ssDNA patterns. This result indicates that the ssDNA with 10T bases is a relatively poor electrical conductor. The capabilities of CM technique are also tested on various nanostructures including the single wall carbon nanotube junction.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

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