Due to their special properties and applications, nanoparticles have received a lot of attention and attracted researchers. Meanwhile, zinc oxide nanoparticles have excellent transparency, electrical, and optical properties. In this research, nanoparticles were synthesized using the hydrothermal method, and a ZnO-CQDs/PVA nanocomposite was prepared using the injection method into a polymer substrate. Optical and structural properties were investigated by various methods such as TEM, XRD, UV-VIS, and DLS. The energy gap in quantum dot zinc oxide-carbon nanocomposite with concentrations of 1240, 2840, and 3720 micrograms injected into the polymer solution was calculated as 3.38, 3.39, and 3.4 eV, respectively. The results show that the energy gap increases with the increase in carbon quantum dots in the nanocomposite indicating the effect of the Burstein-Moss phenomenon. This phenomenon means an increase in the energy gap in semiconductor materials, which can improve the performance of nanoelectronic and optical materials. تفاصيل المقالة