Synthesis, characterization and thermophysical properties of PAG-Amine functionalized graphene quantum dots based nanosuspension

This work presents the synthesis, characterization and evaluation of thermophysical properties of PAG (Polyalkylene glycol)-amine functionalized graphene quantum dots-based nanosuspension. The synthesis is carried out in two steps. In the first step graphene oxide is synthesized using Hummers method and in the next step synthesis of amine functionalized graphene quantum dots is done. The obtained quantum dots are further ultrasonicated in the Polyalkylene glycol resulting in varying concentrations of nanosuspension. For the characterization of graphene oxide Field Emission Scanning Electron Microscopy (FESEM) analysis is done, and for nanosuspension High-Resolution Transmission Electron Microscopy (HRTEM) and ultraviolet (UV)-spectrophotometer analysis is carried out. The thermophysical properties such as thermal conductivity and viscosity are examined using the Hamilton and Maxwell model which are further validated with experimental investigations.