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Cellulose and PEPC based humidity sensor for remote sensing

K. H. S. KARIMOV1,2,* , T A QASURIA1

Affiliation

  1. GIK Institute of Engineering Sciences and Technology, Topi 23460, NWFP, Pakistan
  2. Physical Technical Institute, Aini St. 299/1, Dushanbe, 734063, Tajikistan

Abstract

In this study an investigation was made on properties of humidity sensor fabricated by using cellulose and poly-Nepoxypropyle carbazole (Au/Cellulose/PEPC/Au). The 2 wt. % of cellulose and 2 wt. % of PEPC was dissolved in benzol. Film of cellulose and PEPC deposited on glass substrates with preliminary deposited gold electrodes. The resistances and capacitances of the samples were evaluated under the effect of humidity which ranges from 30%-95%. It was observed that the capacitance of the sensor increases and resistance decreases with increase of the relative humidity. The sensor was connected to op-amp square wave oscillators. It was found that with increase of humidity the oscillator’s frequency also increases in the range of 4.90-12.00 kHz for 65µm thick film sample and 4.80-9.00 kHz for 88µm thick film sample and for 210µm sample the oscillator frequency changes in the range of 4.86-9.00 KHz. This study also shows that how the film thickness effect the oscillator’s frequency with respect of humidity. We can select the hygrometer film thickness according to its application so that more sensitive hygrometer can be designed. This organic humidity sensor controlled oscillator can be used for short-range and long-range telemetry system at environmental monitoring and assessment of the humidity level..

Keywords

Cellulose, Poly-N-epoxypropyl carbazole, Organic Sensor, Humidity, Resistance, Capacitance, Controlled Oscillator..

Submitted at: July 9, 2010
Accepted at: Aug. 12, 2010

Citation

K. H. S. KARIMOV, T A QASURIA, Cellulose and PEPC based humidity sensor for remote sensing, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 8, pp. 1743-1746 (2010)