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PANI/MWCNT based humidity sensor | ||
| Iraqi Journal of Physics | ||
| Article 1, Volume 15, Issue 33, 2017, Pages 111-121 | ||
| Authors | ||
| Hammad R. Humud; Jassim M. Najem; Qudama Khames | ||
| Abstract | ||
| Polyaniline Multi wall Carbon nanotube (PANI/MWCNTs) nanocomposite thin films have been prepared by Plasma jet polymerization at low frequency on glass substrate with preliminary deposited aluminum electrodes to form Al/PANI-MWCNT/Al surface-type capacitive humidity sensors, the gap between the electrodes about 50 µm and the MWCNTs weight concentration varied between 0, 1, 2, 3, 4%. The diameter of the MWCNTs was in the range of 8-15 nm and the length 10-55 µm. The capacitance-humidity relationships of the sensors were investigated at humidity levels from 35 to 90% RH. The electrical properties showed that the capacity increased with increasing relative humidity, and that the sensitivity of the sensor increases with the increase of the additive (MWCNTs); while each of the response time and the recovery time increasing with concentration. The change in MWCNTs concentration leads to a change in the energy gap as well as the initial capacity. The capacitance increases linearly with the relative humidity at MWCNTs concentration of 3% for thus the possibility of manufacturing humidity sensor with good specifications at this concentration. | ||
| Keywords | ||
| Carbon Nanotubes; Humidity sensor; Capacitance; type humidity sensor | ||
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