Orange dye polyaniline composite based impedance humidity sensors

查看全文 作　　者：Muhammad Tariq Saeed [1,2]Chani;Kh. S. [1,3]Karimov;F. A. [1]Khalid;S. Z. [1]Abbas;M. B. [1]Bhatty

机构地区：[1]GIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, Pakistan;[2]Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia;[3]Physical Technical Institute, Aini St. 299/1, Dushanbe, 734063, Tajikistan

出　　处：《Chinese Physics B》索引2013年第22卷第1期,共6页

基　　金：the Higher Education Commission of Pakistan for providing the financial support 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 × 10 4 and 8.8 × 10 3 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance-humidity relationship showed a more uniform change 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 an increase in sensitivity of up to 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：聚苯胺复合材料湿度传感器阻抗染料橙色吸收解吸测量频率恢复时间

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Orange dye polyaniline composite based impedance humidity sensors

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