Effect of displacement on resistance and capacitance of polyaniline film

• Published in: Chinese physics B 2011-04, Vol.20 (4), p.204-208
• Main Authors: Karimov, Khasan Sanginovich, Saeed, Muhammad Tariq, Khalid, Fazal Ahmad, Moiz, Syed Abdul
• Format: Article
• Language: English
• Subjects: PANI; 交流电阻; 位移传感器; 活性物质; 玻璃基板; 聚苯胺膜; 聚苯胺薄膜; 膜电容
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/20/4/040601

This paper investigates the properties of displacement sensors based on polyaniline （PANI） films. About 1 wt% of PANI micropowder is mixed and stirred in a solution of 90 wt% water and 10 wt% alcohol at room temperature. The films of PANI axe deposited from solution by drop-casting on Ag electrodes, which are preliminary deposited on glass substrates. The thicknesses of the PANI films are in the range of 20 μm-80 μm. A displacement sensor with polyaniline film as an active material is designed and fabricated. The investigations showed that, on average, the AC resistance of the sensor decreases by 2 times and the capacitance accordingly increases by 1.6 times as the displacement changes in the range of 0 mm-0.5 mm. The polyaniline is the only active material of the displacement sensor. The resistance and capacitance of the PANI changes under the pressure of spring and elastic rubber, and this pressure is created by the downward movement of the micrometer.