Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (1): 10701-010701.doi: 10.1088/1674-1056/22/1/010701

• GENERAL • 上一篇    下一篇

Orange dye–polyaniline composite based impedance humidity sensors

Muhammad Tariq Saeed Chania b, Kh. S. Karimova c, F. A. Khalida, S. Z. Abbasa, M. B. Bhattya   

  1. a GIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, Pakistan;
    b Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia;
    c Physical Technical Institute, Aini St. 299/1, Dushanbe, 734063, Tajikistan
  • 收稿日期:2012-01-05 修回日期:2012-02-28 出版日期:2012-12-01 发布日期:2012-12-01

Orange dye–polyaniline composite based impedance humidity sensors

Muhammad Tariq Saeed Chania b, Kh. S. Karimova c, F. A. Khalida, S. Z. Abbasa, M. B. Bhattya   

  1. a GIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, Pakistan;
    b Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia;
    c Physical Technical Institute, Aini St. 299/1, Dushanbe, 734063, Tajikistan
  • Received:2012-01-05 Revised:2012-02-28 Online:2012-12-01 Published:2012-12-01
  • Contact: Muhammad Tariq Saeed Chani E-mail:tariq_chani@yahoo.com

摘要: This study presents the fabrication and investigation of humidity sensors based on orange dye (OD) and polyaniline (PANI) composite films. A blend of 3 wt.% OD with 1 wt.% PANI was prepared in 1 ml water. The composite films were deposited on glass substrates between pre-deposited silver electrodes. The gap between the electrodes was 45 μm. The sensing mechanism was based on the impedance and capacitance variations due to the absorption/desorption of water vapor. It was observed that with the increase in relative humidity (RH) from 30% to 90%, the impedance decreases by 5.2×104 and 8.8×103 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance-humidity relationship showed a more uniform change as compared to the capacitance-humidity relationship in the RH range of 30% to 90%. The consequence of annealing, measuring frequency, response and recovery time, and absorption-desorption behavior of the humidity sensor were also discussed in detail. The annealing resulted in the increase in sensitivity upto 2.5 times, while the measured response time and recovery time were 34 s and 450 s, respectively. The impedance-humidity relationship was simulated.

关键词: organic-organic composite, humidity sensor, polyaniline, orange dye

Abstract: This study presents the fabrication and investigation of humidity sensors based on orange dye (OD) and polyaniline (PANI) composite films. A blend of 3 wt.% OD with 1 wt.% PANI was prepared in 1 ml water. The composite films were deposited on glass substrates between pre-deposited silver electrodes. The gap between the electrodes was 45 μm. The sensing mechanism was based on the impedance and capacitance variations due to the absorption/desorption of water vapor. It was observed that with the increase in relative humidity (RH) from 30% to 90%, the impedance decreases by 5.2×104 and 8.8×103 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance-humidity relationship showed a more uniform change as compared to the capacitance-humidity relationship in the RH range of 30% to 90%. The consequence of annealing, measuring frequency, response and recovery time, and absorption-desorption behavior of the humidity sensor were also discussed in detail. The annealing resulted in the increase in sensitivity upto 2.5 times, while the measured response time and recovery time were 34 s and 450 s, respectively. The impedance-humidity relationship was simulated.

Key words: organic-organic composite, humidity sensor, polyaniline, orange dye

中图分类号:  (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

  • 07.07.Df
07.07.Vx (Hygrometers; hygrometry) 72.80.Le (Polymers; organic compounds (including organic semiconductors)) 84.37.+q (Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))