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Single Stranded DNA Decorated Carbon Nanotube Transistors for Chemical Sensing

Published online by Cambridge University Press:  01 February 2011

Cristian Staii ,
Michelle Chen ,
Alan Gelperin  and
Alan T. Johnson
Cristian Staii
Affiliation:
cstaii@physics.upenn.edu, University Of Pennsylvania, Physics and Astronomy, 209 South, 33 Street, Philadelphia, PA, 19104, United States, 215-546-1810
Michelle Chen
Affiliation:
chenm@seas.upenn.edu, University of Pennsylvania, Material Science and Engineering,, United States
Alan Gelperin
Affiliation:
agelperin@monell.org, University of Pennsylvania, Monell Chemical Senses Center, United States
Alan T. Johnson
Affiliation:
cjohnson@physics.upenn.edu, University of Pennsylvania, Physics, United States
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Abstract

We demonstrate that single walled carbon nanotube field effect transistors (swCN-FET) decorated with single stranded DNA (ss-DNA) form a new, versatile, and highly sensitive class of nanoscale chemical sensors. These sensors are based on ss-DNA as the chemical recognition site and swCN-FET as the electronic read-out component. The ss-DNA decorated swCN-FETs are sensitive to chemical species (odors) that do not cause a detectable response in bare, as-fabricated swCN-FETs. Furthermore, odor responses ss-DNA decorated FETs differ in sign and magnitude for different odors, and the response characteristics depend on the base sequence of the ss-DNA used to decorate the swCN. The sensor surface is self-regenerating: samples maintain a constant response with no need for sensor refreshing through at least several dozens gas exposure cycles. These remarkable attributes suggest that DNA-decorated swCN-FET sensors could be created with sensitivity to a large variety of compounds, as required for “electronic-nose” and “electronic tongue” applications in medicine and homeland security.

Keywords

sensornanostructurebiological
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O08-08
Copyright
Copyright © Materials Research Society 2006

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References

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