Multifunctional Quantum Dot Nanofillers in Polymer Nanocomposites

Starting from a conceptual nanofiller quantum dot (QD) model embedded in organic polymer matrices, its multifunctional characteristics are revealed. As typical examples, polyethylene/MgO and epoxy/SiO2 nanocomposites are investigated, focusing on charge transport under both low and high electric fields. Special attention is given to charge traps within the QDs, including both intra-dot and inter-dot charge transfer mechanisms. It is inferred that the nanofiller QDs can act as either deep or shallow traps, depending on the specific combinations of polymers and nanofillers, as well as the applied electric field. They may also function as exciton killers, potentially leading to the degradation of polymer matrices.