Abstract
${{\rm{VS}}_2}$ was prepared via the hydrothermal method and changing the reaction time and employing surfactant. The microstructural characterizations show the control of sheet dimensions and growth of crystal planes. The Z-scan study demonstrates the positive nonlinear ${n_2}$ due to the self-focusing effect and the two-photon absorption for nonlinear absorption. These results imply the effect of lateral dimensions of sheets in cauliflower-like structures on nonlinear optical responses. Also, the nonlinear optical susceptibility $\chi^{(3)}$ is as high as ${{1}}{{{0}}^{- 10}}$ (esu). This study shows that the ${{\rm{VS}}_2}$ flower-like structure and its similar nanostructures are promising materials for nonlinear optical applications and further considerations.
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