I. Sayago, M. J. Fernández, J. Fontecha, M. C. Horrillo, E. Terrado, A. Seral-Ascaso, E. Muñoz
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Surface acoustic wave (SAW) gas sensors based on the use of carbon nanotube (CNT) networks as sensitive layers have been investigated for the detection of atmospheric gas pollutants: volatile organic compounds (VOCs), NO2, CO, and H2 . SAW sensor configuration consists of a delay line made on a piezoelectric substrate (ST -X cut quartz) and a sensitive layer (CNTs) deposited between the interdigital transducers (IDTs). CNT networks were fabricated by airbrushing single-walled-(SWCNTs) and double-walled- (DWCNTs) CNT dispersions onto quartz substrates. Among all the tested CNT materials and gases, only DWCNT -based SAW sensors were sensitive upon exposure to low concentration of octane and toluene, providing fast response and recovery times to these VOCs.
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