Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 191, Issue -, Pages 24-30Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.09.079
Keywords
PEO; Composite film; Bilayer film; Gas sensor; Toluene; Room temperature
Funding
- National Natural Science Foundation of China [61176006, 61006036]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120185110012]
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Two kinds of toluene vapor sensors with different sensitive film structures, i.e., multi-walled carbon nanotubes (MWCNTs)-polyethylene oxide (PEO) composite film and MWCNTs-PEO bilayer film were fabricated. Both sensors were obtained by airbrushing the sensitive films on interdigitated electrodes (IDE). Response performances of both sensors to toluene vapor at room temperature were investigated. Scanning electron microscope (SEM) was used for morphology analysis of the sensitive films. The experimental results showed that sensors with bilayer films revealed a larger sensitivity than that with the composite films. The response and recovery times of both sensors were within 8s. Moreover, sensors with bilayer films exhibited a modest selectivity to toluene vapor. The sensing mechanisms of both sensors were studied as well. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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