Synthesis of novel poly 4,4′-diaminodiphenyl sulphone-Fe2O3 nanocomposites for better electrochemical capacitance

A novel poly 4,4'-diaminodiphenyl sulphone (PDDS)-Fe2O3 nanocomposite was synthesized from 4,4'-diaminodiphenyl sulphone in presence of iron oxide nanoparticles by oxidation polymerization using potassium perdisulphate. The solubility performance of PDDS-Fe2O3 nanocomposites exposed better solubility with chloroform, trichloroethylene, N,N-dimethylformamide (DMF) and dimethyl sulphoxide (DMSO). Field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) analyses showed mixed granular nature of the PDDS-Fe2O3 nanocomposites. Energy-dispersive X-ray (EDAX) analysis confirmed the presence of iron oxide nanoparticles in the composites. X-ray diffraction patterns revealed the formation of highly crystalline PDDS-Fe2O3 with similar to 40-nm size of crystallites. A single absorption peak observed at around 3450 cm(-1) is due to the N-H stretching vibration of the imino groups of PDDS-Fe2O3 nanocomposites, and it has revealed the participation of N-H group in the polymerization process. The conductivity of the PDDS-Fe2O3 nanocomposites was determined to be 7.14 x 10(-2) S cm(-1). The observed capacitance value (256 +/- 5 mu F) of chemically synthesized PDDS-Fe2O3 nanocomposites has proven their promising application as an energy storage material.