Carbon nanotube based sensors and fluctuation enhanced sensing

Kukovecz, Ákos and Molnár, Dániel and Kordás, Krisztián and Gingl, Zoltán and Moilanen, Hannu and Mingesz, Róbert Zoltán and Kónya, Zoltán and Haspel, Henrik and Sápi, András and Kiricsi, Imre (2010) Carbon nanotube based sensors and fluctuation enhanced sensing. PHYSICA STATUS SOLIDI C-CURRENT TOPICS IN SOLID STATE PHYSICS, 7 (3-4). pp. 1217-1221. ISSN 1862-6351

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Abstract

Drop-cast thin films of multi-walled carbon nanotubes are used as gas sensors in a four-probe measurement setup. The novelty of the approach is that the sensor information is extracted from the noise of the de resistance data using Fluctuation Enhanced Sensing (FES). We investigate the effects of measurement duration, gate voltage and frequency window on the chemical selectivity of the MWCNT-FES sensor. The selectivity of the device is superior to those of conventional gas sensors, and preliminary experiments indicate that it may also be possible to extract quantitative information from the noise. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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