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Proceedings Paper

Improving the performance of functionalized carbon nanotube thin film sensors by fluctuation enhanced sensing
Author(s): Akos Kukovecz; Péter Heszler; Krisztián Kordás; Siegmar Roth; Zoltán Kónya; Henrik Haspel; Radu Ionescu; András Sápi; Jani Maklin; Melinda Mohl; Zoltán Gingl; Robert Vajtai; Imre Kiricsi; Pulickel M. Ajayan
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Paper Abstract

Thin films of functionalized single-wall carbon nanotubes were deposited on silicon chips by drop-coating and inkjet printing. These sensors were subjected to 1-100 ppm NOx, CO, H2S and H2O vapor in synthetic air. We have found that besides the expected changes in the electrical resistance of the film, there are also characterteristic differences in the noise pattern of the resistance vs. time function. This phenomenon is called fluctuation enhanced sensing and it can be used to increase the amount of information gathered from a carbon nanotube sensor device. The main advantage of fluctuation enhanced sensing is the improved selectivity of the sensor even if changes in electical resistance are rather low. Combined with differentiation based on modifying the adsorption characterstics of the nanotubes (e.g. by covalent functionalization), fluctuation enhanced sensing appears to be a very useful method for bringing cheap and reliable carbon nanotube based chemical sensors to the market.

Paper Details

Date Published: 4 September 2008
PDF: 10 pages
Proc. SPIE 7037, Carbon Nanotubes and Associated Devices, 70370Y (4 September 2008); doi: 10.1117/12.794176
Show Author Affiliations
Akos Kukovecz, Univ. of Szeged (Hungary)
Péter Heszler, Univ. of Szeged (Hungary)
Krisztián Kordás, Univ. of Oulu (Finland)
Siegmar Roth, Max Planck Institute for Solid State Research (Germany)
Zoltán Kónya, Univ. of Szeged (Hungary)
Henrik Haspel, Univ. of Szeged (Hungary)
Radu Ionescu, Rovira i Virgili Univ. (Spain)
András Sápi, Univ. of Szeged (Hungary)
Jani Maklin, Univ. of Oulu (Finland)
Melinda Mohl, Univ. of Szeged (Hungary)
Rice Univ. (United States)
Zoltán Gingl, Univ. of Szeged (Hungary)
Robert Vajtai, Rice Univ. (United States)
Rensselaer Polytechnic Institute (United States)
Imre Kiricsi, Univ. of Szeged (Hungary)
Pulickel M. Ajayan, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 7037:
Carbon Nanotubes and Associated Devices
Manijeh Razeghi; Didier Pribat; Young Hee Lee, Editor(s)

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