Journal
ACS NANO
Volume 7, Issue 3, Pages 2800-2807Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400359c
Keywords
vapor sensor; carbon nanotube; field effect transistor; DNA; electronic nose
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Funding
- Department of Defense U.S. Air Force Research Laboratory
- UES [FA8650-09-D-5037]
- Army Research Office [W911NF-11-1-0087]
- SMART Fellowship
- Nano/Bio Interface Center through the National Science Foundation NSEC [DMR08-32802]
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Vapor sensors based on functionalized carbon nanotubes (NTs) have shown great promise, with high sensitivity conferred by the reduced dimensionality and exceptional electronic properties of the NT. Critical challenges in the development of NT-based sensor arrays for chemical detection include the demonstration of reproducible fabrication methods and functionalization schemes that provide high chemical diversity to the resulting sensors. Here, we outline a scalable approach to fabricating arrays of vapor sensors consisting of NT field effect transistors functionalized with single-stranded DNA (DNA-NT). DNA-NT sensors were highly reproducible, with responses that could be described through equilibrium thermodynamics. Target analytes were detected even in large backgrounds of volatile Interferents. DNA-NT sensors were able to discriminate between highly similar molecules, including structural isomers and enantiomers. The sensors were also able to detect subtle variations in complex vapors, including mixtures of structural isomers and mixtures of many volatile organic compounds characteristic of humans.
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