Studying the Conductivity Effect of Polythiophene / Polypyrrole / Polyaniline (PT /PPY /PANI) Deposition on Indium Tin Oxide (ITO) Glass

Abstract

The conducting polymer family is widely used in the field of polymer-based sensors. Among the polymers that are often used are polyaniline (PANI), polypyrrole (PPY) and polythiophene (PT). Sensors operate based on the production of signals by analyte molecules which then produce measurements either qualitatively or quantitatively. In addition, the use of conducting polymers in the field of biosensing has highlighted its importance, especially in the fields of biomedicine, environment, food quality control and more. Even so, there are issues that often arise such as controlling and producing signals of the materials used. Appropriate materials and methods also need to be studied. Therefore, this study was conducted to examine the conductivity effect of the deposition of Polythiophene / Polypyrrole / Polyaniline (PPY/ PT/PANI) on Indium Tin Oxide (ITO) Glass. Polyaniline monolayer (PANI) was deposited on the surface of indium tin oxide (ITO) glass using the Langmuir Blodgett (LB) technique. The monolayer surface of PANI particles has been coated with a layer of polypyrrole (PPY) and polythiophene (PT). PPY and PT were dissolved in methanol and then added with p-toluene sulfonic acid (PTSA) to give the same effect as PANI, especially on their back chain structure. The UV-Vis and FTIR spectra prove the existence of peaks resulting from the solubility and doping process against PPY and PT. It was found that the uneven size of the polymer molecules results from the PPY / PANI image because there is a probability that the existing PPY clumps with each other. When PT was applied to the PPY / PANI layer, a combination of the three polymers formed a cavity on the surface of the PT / PPY / PANI layer. It was explained by the analysis of FTIR PT / PPY / PANI which exhibits the existence of bonds between the combined polymers. The material resistance decreases when the three polymers were combined which explains the higher conductivity value obtained.