Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 245, Issue -, Pages 25-33Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.01.132
Keywords
Polyaniline; Carbon; Nanotube; Ammonia; Sensor
Funding
- CNPq
- CAPES
- F. Araucaria
- INCT-Nanocarbono (CNPq)
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Here, composites based on carbon nanotubes and polyaniline films were tested, as ammonia gas sensors with three different doping approaches (sulfuric acid, camphorsulfonic acid and m-cresol). The polyaniline high sensitivity to ammonia combined with the stability of the carbon nanotube increased the sensors reproducibility when compared to a regular polyaniline. The sensor in which the doping was performed by camphorsulfonic acid, presented the best sensor responsefor ammonia gas (418%) when compared to the others. This result is addressed to the better polymer configuration achieved by this procedure. The device's operation in low concentrations of ammonia indicates a strong adsorption process whit a limit of detection of 4 ppm. (C) 2017 Elsevier B.V. All rights reserved.
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