ZnS-integrated polypyrrole and emeraldine polyaniline composites for enhance photophysical and electrochemical performance for an active layer in an optoelectronic device

Abstract

In this article, the work has been planned with the primary goal of investigating the influence of ZnS on the structural, optical, thermal, and electrochemical characteristics of polymers (polypyrrole and polyaniline). Polypyrrole-ZnS (PPZ), Polyaniline-ZnS (PAZ) was synthesized by chemical oxidative in-situ polymerization method. The formation of the phase, crystallinity, and cell parameter of the synthesized samples were examined through X-ray diffraction. FTIR and Raman spectroscopy was used to determine the desired functional group and state of the molecules present in the synthesized compounds. The materials' in-depth surface morphology was investigated using TEM and FESEM. EDX and XPS analyses were performed to determine the elemental, chemical, and electronic states of the atoms within the materials. The PPZ and PAZ optical band gaps were calculated to be 2.19 eV and 1.84 eV, respectively, with refractive indexes of 1.96 and 2.36, indicating strong optical conductivity in the visible region. The PL spectra indicated a significant rate of electron-hole recombination in the blue region. TGA-DSC-DTA research revealed that polymeric composites for emissive layer materials have high thermal stability. Polymeric composites achieved excellent current density and electrical conductivity. The above findings showed that PPZ and PAZ are suitable materials for emissive layers in PLEDs.