Assessment of dielectrical and electrochemical properties of PPY:CuO:rGO nanocomposite for organic light-emitting diodes and supercapacitor applications
摘要
Two-dimensional (2D) reduced graphene oxide (rGO) and polypyrrole-copper oxide (PPY:CuO) fillers were synthesized by polymerizing of pyrrole monomer. The synthesis of PPY:CuO:rGO nanocomposites was validated by the XRD spectra, which exhibited the reduction peak of graphene oxide (GO), an amorphous band connected with polypyrrole (PPY), and crystalline peaks related to the CuO nanoparticles. The FESEM and TEM image showed the heterogenous distribution of CuO, with a significant presence of two-dimensional (2D) rGO sheets within the PPY matrix. The dielectric constant and dielectric loss of the PPY:CuO:rGO nanocomposite were ~ 2223 and ~ 900, respectively, at a temperature of 313 K. The increment in ac conductivity of the PPY:CuO:rGO nanocomposite was observed in the high frequency range. The electrochemical analysis revealed that the PPY:CuO:rGO nanocomposite exhibited the high specific capacitance value (850.12 F/g) under a scan rate of 10 mV s−1. Even at high power density ~ 1120 W/kg, PPY:CuO:rGO nanocomposites demonstrated a comparatively elevated energy density of 16.56 W h/kg at current density of 2.8 A/g. These robust characteristics of PPY:CuO:rGO nanocomposite suggest its potential applicability as an electron transport layer (ETL) in organic light-emitting diodes (OLED) devices and as an electrode material in supercapacitors.