▎ 摘　　要

In this work, improved graphene oxide (Im-GO) was synthesized by modified Hummers' method and Im-GO thin films (TFs) were produced by drop casting technique. The physicochemical, morphological and structural characteristics of the prepared samples were studied using different characterization methods such as scanning electron microscopy (SEM), X-ray diffraction, UV-Vis absorption, FTIR analysis and Raman spectroscopy. Linear and nonlinear optical properties of as-prepared samples were evaluated by Z-scan technique and using a He-Ne laser (632 nm), respectively. The results showed higher nonlinear refraction index (n(2)) and nonlinear absorption coefficient (beta) of the prepared Im-GO thin films, as compared to previously reported values.