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Fluctuation enhanced gas sensing on functionalized carbon nanotube thin films
Author(s) -
Haspel Henrik,
Ionescu Radu,
Heszler Péter,
Kukovecz Ákos,
Kónya Zoltán,
Gingl Zoltán,
Mäklin Jani,
Mustonen Tero,
Kordás Krisztián,
Vajtai Robert,
Ajayan Pulickel M.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200879593
Subject(s) - carbon nanotube , thin film , drop (telecommunication) , silicon , materials science , nanotechnology , electrical resistance and conductance , analytical chemistry (journal) , chemical engineering , optoelectronics , chemistry , composite material , organic chemistry , computer science , telecommunications , engineering
Thin films of functionalized carbon nanotubes were deposited on silicon chips by drop‐coating and inkjet printing. These sensors were exposed to 50 ppm N 2 O, CO, H 2 S and H 2 O vapour in dry synthetic air. We have found relatively small changes in the electrical resistance of the films exposed to the different test gases. However it is shown that chemical classification of the test gases could still be achieved. To this end pattern recognition technique (Principal Component Analysis) was applied on the acquired power spectral density of the stationary resistance fluctuations of the sensors. The method, whereby fluctuations are used to increase the chemical selectivity of electronic sensors, is called fluctuation enhanced sensing. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)