Synthesis, DSC Properties, Surface Morphology and the Third-Order Behavior Studies of a Conducting Polymer

Abstract

In this study, the compound polyaniline (PANI) with three different concentrations of (H₂SO₄) sulfuric acid has been synthesized by the chemical polymerization method and characterized by FTIR spectrophotometer to detect effective group, field emission scanning electron microscopy (FE-SEM) and UV‒Vis absorption spectroscopic. They performed a differential calorimetric scan to describe the behavior of the compound as it measures the thermal energy that circulates from or to the polymer reported. The endo-thermic transition, due to structural adjustment, is a characteristic of the PANI. Casting has been a suitable method for preparing PANI films on FTO glass. The third order non-linear optical (NLO) properties of thin films were investigated using the Z-scan technique. The experimental data recorded resulted in the calculation of the nonlinear optical absorption coefficient, the nonlinear refractive index. PANI at various concentrations of sulfuric acid has a significant optical nonlinearity. Such material could expect new photon applications. The polymer samples with different concentrations exhibits high nonlinear reflective index under continuous wave laser at the experimental wavelength. Reverse saturable absorption is the dominating mechanism for the observed absorption nonlinearities. Therefore, compound polyaniline emerges as a potential candidate for photonic device applications. The synthesized thin film structures of PANI with three different concentrations of (H₂SO₄) sulfuric acid shows the response to NH₃ gas sensing in the range 20–250 ppm and can be used for NH₃ sensing application.