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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。
The graphene oxide-cadmium selenide (GO-CdSe) nanocomposites were prepared by a two-phase method and the reduced graphene oxide-cadmium selenide (RGO-CdSe) nanocomposites were prepared by hydrazine hydrate reduction. The morphology, structure and optical properties of the composites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-Vis spectroscopy and fluorescence spectroscopy. The CdSe QDs have a sphalerite structure with a particle size of about 6 nm and are distributed uniformly on the RGO chip. The third-order optical nonlinear absorption properties of the composites were studied by single-beam Z-scan technique under the action of 532nm wavelength and 30ps pulse width. The results show that the RGO-CdSe nanocomposites exhibit non-linear optical properties of reverse saturable absorption. Compared with RGO with no CdSe quantum dots attached, the optical nonlinear absorption properties of the composites are enhanced. The nonlinear absorption coefficient of RGO-CdSe nanocomposites is 18.3cm / GW, which is higher than 11.2cm / GW of pure RGO. The experimental results show that RGOCdSe nanocomposites have potential applications in optical limiter, optical switch and other optical devices.