▎ 摘　　要

Among various graphene based materials, graphene-transition metal oxide nanoparticles have recently attracted tremendous research interest owning to their unique structural advantages, and demonstrated promising chemical and physical properties for various applications. In the present study, we discuss the pH effect on the structural, optical and electrical properties of graphene-vanadium oxide nanoparticles (rGO/VO-NPs) nanocomposites prepared via a hydrothermal method. The structural and morphological investigations reveal the high crystallinity of rGO/VO-NPs nanocomposites as well as, the uniform coating of graphene layers around the surface of vanadium oxides nanoparticles ensuring good electrical contact and showing a higher conductivity in function of pH. Moreover, ultraviolet visible spectra (UV-Vis) (absorbance) confirm the improvement of the optical properties. Hence, the growth conditions have a great influence on the formation of the synthesized final material. The use of these nancomposites is promising way for the development of technological applications especially for energy storage devices as lithium-ion batteries.