Dielectric relaxation studies of Eu3+ doped graphene oxide nano layers

Abstract

Abstract A bulk of graphene oxide nanosheets was prepared using the modified Hummers’ method. Rare earth materials, such as europium nitrate pentahydrate compounds, are added to graphene oxide in varying percentages to study the dielectric behavior of graphene oxide. The morphological analysis revealed a nanosheet-like pattern in pure graphene oxide, while for europium-doped graphene oxide, a cluster of europium atoms seemed trapped between layers of graphene. The electron diffraction rings are indexed using multiphase analysis, and the hexagonal carbon structure remains unaltered in the doped samples. Electrochemical impedance spectroscopy (EIS) studies were conducted on pure and Europium-doped graphene oxide. The frequency variations with respect to the real and imaginary parts of the dielectric constants are studied for both the composite material and pure graphene oxide. Additionally, photoluminescence (PL) studies were performed. The emission spectrum of Eu3+-doped graphene oxide was used to study the Judd–Ofelt parameters, and the allowed transition probability was determined. Graphical Abstract

Keywords

• Graphene nanosheets
• Electrochemical impedance spectroscopic studies
• Dielectric relaxation studies
• Photoluminescence studies
• Judd–Ofelt parameters