Abstract
ZnSe/graphene composites are produced by chemical method, and the attachment of ZnSe nanocrystals on graphene nanosheets can be confirmed by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and UV-vis spectroscopy. The nonlinear optical properties are investigated at 532 nm by a picosecond laser Z-scan technique. It is found that the interaction between ZnSe and graphene enhances the optical nonlinearity of ZnSe/graphene composites than single ZnSe or graphene. The increase of ZnSe size further enhances the optical nonlinearity of ZnSe/graphene.
Highlights
Composite material has played an important role in many areas, instead of a lot of traditional materials.[1]
In our work, we focus on the nonlinear optical properties of ZnSe/graphene composites
ZnSe quantum dots was prepared by the method similar with ZnSe/graphene composites
Summary
Composite material has played an important role in many areas, instead of a lot of traditional materials.[1]. Graphene/semiconductor nanocomposites perform good third-order nonlinear optical properties. Kole et al conducted a study on the nonlinear optical properties of graphene oxide nanocomposites and found that the nonlinear optical properties of the composite materials were enhanced.[9] Ouyang et al have done a study on the synthesis and enhanced nonlinear optical properties of graphene/CdS.[10] Among the semiconductor materials composed with graphene, II-VI semiconductor materials such as CdS with narrow band gap are used, while semiconductor with a wide direct transition band structure such as ZnSe is seldom mentioned.[11,12] ZnSe displays good optical nonlinearity,[13] the third-order optical nonlinearity and the mechanism of ZnSe/graphene composites is seldom studied. The third-order optical nonlinearity of the composites was observed to be enhanced compared to the monomer material.
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