中文摘要：

通过两相法制备了氧化石墨烯-硒化镉（GO-CdSe）纳米复合材料,并进一步通过水合肼还原,制备了还原氧化石墨烯-硒化镉（RGO-CdSe）纳米复合材料。通过透射电镜（TEM）、X射线衍射仪（XRD）、紫外可见光吸收（UV-Vis）光谱和荧光（PL）光谱对复合材料的形貌、结构和光学特性进行了表征。CdSe量子点为闪锌矿结构,粒径在6nm左右,基本均匀的分布在RGO片上。在波长为532nm、脉冲宽度为30ps的激光作用下,采用单光束Z扫描技术,对复合材料的三阶光学非线性吸收性质进行了研究。研究发现,RGO-CdSe纳米复合材料展现出反饱和吸收的非线性光学特性;相对于未附着CdSe量子点的RGO,复合材料的光学非线性吸收特性有所增强。RGO-CdSe纳米复合材料的非线性吸收系数为18.3cm/GW,高于纯RGO的11.2cm/GW。实验结果表明,RGOCdSe纳米复合材料在光限幅器、光开关等光学器件方面有着潜在的应用前景。

英文摘要：

Graphene oxide-cadmium selenide（GO-CdSe）nanocomposites were synthesized by a facile two-phase method,and reduced graphene oxide-cadmium selenide（RGO-CdSe）nanocomposites were further synthesized using hydrazine hydrate as reducing agent.The morphology,structure and optical properties of the nanocomposites were characterized by transmission electric microscopy（TEM）,X-ray diffraction（XRD）,ultraviolet-visible（UV-VIS）absorption spectrum and photoluminescence（PL）spectrum.The CdSe quantum dots are zinc blende structure,and the diameters of the quantum dots are about6 nm,which are uniformly distributed on the RGO surface.The third-order optical absorption nonlinearities of the RGO-CdSe nanocomposites were investigated by using picosecond Z-scan technique at 532 nm.The reverse saturable absorption properties of RGO-CdSe composites were observed.The RGOCdSe nanocomposites exhibit enhanced nonlinear optical absorption properties compared with RGO.The nonlinear absorption coefficient of RGO-CdSe composite is 18.3cm/GW,which is higher than the nonlinear absorption coefficient of pure reduced graphene oxide of 11.2cm/GW.The results indicate that the RGO-CdSe nanocomposites are promising for optical devices,such as optical limiters and optical switch.