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首先对Au纳米颗粒进行巯基修饰,再对其采用表面活性剂十六烷基三甲基溴化铵(CTAB)进行二级修饰,并将其自组装负载于石墨烯纳米毯(GNSs)上。通过紫外-可见吸收光谱证明Au纳米颗粒在石墨烯纳米毯(GNSs)上的成功负载。通过透射电子显微镜探明其微观结构,表明Au纳米颗粒在石墨烯纳米毯上呈现局部规整排列,其原因与石墨烯纳米毯自身的平整结构有关。采用开孔Z-扫描技术研究了负载Au纳米颗粒的石墨烯纳米毯的非线性光限幅性能,结果表明:其光限幅起始阈值明显下降,在低入射能量时即产生光限幅特性。并发现入射光强增大时非线性散射增强,说明非线性散射是产生复合体系的非线性光限幅效应的重要机理。
Firstly, Au nanoparticles were modified with mercapto groups, and then secondary surface modified with hexadecyltrimethylammonium bromide (CTAB) and then self-assembled on graphene nanorods (GNSs). The successful loading of Au nanoparticles on graphene nano-carpets (GNSs) was demonstrated by UV-Vis absorption spectra. The microstructure of the graphene nanorods was proved by TEM. The reason is that the Au nanoparticles are related to the flat structure of the graphene nanorods. The open-aperture Z-scan technique was used to study the nonlinear optical limiting properties of graphene nanorods loaded with Au nanoparticles. The results showed that the initial threshold of optical limiting amplitude decreased obviously, and the optical limiting properties at low incident energy . It is found that the nonlinear scattering increases when the incident light intensity increases, which shows that the nonlinear scattering is an important mechanism to produce the nonlinear optical limiting effect of the composite system.