The Effect of Temperature on Electric Conductivity of Polyacrylonitrile-Polyaniline Fibers

Abstract

The article presents an analysis of the influence of temperature on the electrical conductivity of composite polyacrylonitrile-polyaniline fibers (PAN/PANI). The fibers are obtained by synthesizing polyaniline directly in the spinning solution of fiber-forming polyacrylonitrile and characterized by X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) methods. Electrical characterization of fibers is performed by current-voltage characteristic. The polarizing voltage of the electrodes in the range from -1 V to 1 V with a speed of 100 mV/sec is changed cyclically and linearly while simultaneously the current is measured. The current-voltage characteristic of the fibers is recorded at various temperatures in the range from -15 °C to 100 °C for 30 min. Based on the measurements, temperature changes in the conductance are determined in constant relative humidity. The current-voltage characteristics of the fibers in the ambient atmosphere with a relative humidity of 38 % are linear and symmetrical, which indicates the electron nature of the conductivity and the ohmic contact of the electrode-fiber. The characteristic of temperature conductance changes is not of a typical shape, it is parabolic. The conductance of the developed PAN/PANI fibers at 22 °C is about 1.50•10 -4 S (6.7 kΩ) and decreases below and above this temperature. The analysis of research results and literature data enables the determination of individual factors affecting changes in conductance of the tested composite fiber.

Ternary nanocomposite comprising MnO2, GQDs, and PANI as a potential structure for humidity sensing applications

“…Owing to its superior conductivity, thermal stability, and sensitivity to gases, polyaniline (PANI) became an ideal polymeric candidate 29 , 30 . PANI was previously reported as a promising candidate in sensing applications 18 , 31 , 32 , anti-corrosion coatings 33 Photocatalysis 34 , 35 , optoelectronics 36 , 37 , and energy storage appliances 38 – 42 .…”