Seebeck coefficient and thermal properties of graphene oxide doped calcium cobalt copper oxide nanoceramics

Abstract

In this study, graphene oxide undoped and doped Ca3Co3.8Cu0.2Ox nanoceramic materials were produced using the sol–gel method. After achieving gelation of the mixtures produced via this method, calcination was carried out to remove organic structures. The nanoceramic powders obtained from calcination were compressed as pellets, which were sintered to ensure the fusion of the structures. Graphene oxide undoped and doped pellets were characterized, and the Seebeck coefficient and thermal conductivity as a function of temperature were determined for these samples using a physical properties measurement system device. Upon examining the characterizations, it was generally observed that the crystallite sizes decreased with the addition of graphene oxide, which was consistent with the XRD and SEM results. When the peaks in the FTIR results were compared with the compound bond structures in the XRD results, they were found to be compatible in both samples. Additionally, when the EDX and mapping results were examined, the elements were found to be consistent with the XRD, FTIR and TGA results. TGA analysis demonstrated that graphene oxide doping shifted decomposition temperatures and enhanced combustion efficiency by reducing carbon content. BET results demonstrated that graphene oxide doping significantly increased the surface area and alters the pore structure. In the Seebeck coefficient results, the addition of graphene oxide provided a 1.3-fold advantage at room temperature, and a 10-fold advantage in thermal conductivity was observed with the addition of graphene oxide.