▎ 摘　　要

In this study, crystalline graphene quantum dots (GQDs) is prepared using agro waste of paddy straw via hydrothermal route and GQDs reinforced fly ash polymer nanocomposites was prepared for the first time. HR-TEM and XRD investigations confirmed the formation of hexagonal GQDs with average diameter of 8 nm. Nanocomposite prepared with GQDs reinforcement in fly ash waste under epoxy system was fabricated through the compressive molding machine. Graphene quantum dots-fly ash polymer nanocomposites showed a substantial and concurrent increase in dielectric constant (epsilon') up to similar to 350 compared to fly ash based polymer composites (epsilon'similar to 13). The GQDs-reinforced fly ash based nanocomposites possess the high flexural strength of 60 MPa, whereas pristine fly ash polymer hybrid composite exhibited flexural strength of 35 MPa. The unconventional dielectric enhancement and flexural strength of agro waste derived GQDs reinforced fly ash polymer nanocomposite is attributed to the sudden increase in the electric dipoles and improved interfacial and chemical bonding of crystalline GQDs with fly ash and epoxy. (C) 2022 Elsevier B.V. All rights reserved.