Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China.
Phys Chem Chem Phys. 2013 Jul 14;15(26):11048-53. doi: 10.1039/c3cp51154e. Epub 2013 May 28.
G/Ag2S composites were synthesized for the first time by a hydrothermal method. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy analysis demonstrated that Ag2S nanoparticles with a diameter of about 130 nm uniformly covered the graphene surfaces. G/Ag2S composites were dispersed in methyl methacrylate (MMA), polymerized at 75 °C for 30-35 min, and finally dried at 45 °C for 10 h, to afford G/Ag2S/PMMA organic glasses. The nonlinear absorption (NLA) properties of the G/Ag2S/PMMA organic glasses with different amounts of G/Ag2S were investigated by an open-aperture Z-scan technique. The experimental results showed that the G/Ag2S/PMMA organic glass with an appropriate amount of G/Ag2S exhibited enhanced reverse saturable absorption (RSA) properties compared to G/PMMA and Ag2S/PMMA organic glasses, which was attributed to the notable synergistic effects between graphene and Ag2S. Both one-photon absorption (OPA) in Ag2S and two-photon absorption (TPA) in graphene played important roles in RSA processes of the G/Ag2S/PMMA organic glasses. The effective NLA coefficient βeff of the G/Ag2S/PMMA organic glasses was in the order of 10(3) cm GW(-1). Thus this kind of organic glasses have great promise in optical limiter and optical shutter applications.
G/Ag2S 复合材料首次通过水热法合成。X 射线衍射、扫描电子显微镜和透射电子显微镜分析表明，Ag2S 纳米粒子均匀覆盖在石墨烯表面，直径约为 130nm。G/Ag2S 复合材料分散在甲基丙烯酸甲酯（MMA）中，在 75°C 下聚合 30-35 分钟，最后在 45°C 下干燥 10 小时，得到 G/Ag2S/PMMA 有机玻璃。通过开孔径 Z 扫描技术研究了不同含量 G/Ag2S 的 G/Ag2S/PMMA 有机玻璃的非线性吸收（NLA）特性。实验结果表明，与 G/PMMA 和 Ag2S/PMMA 有机玻璃相比，适量 G/Ag2S 的 G/Ag2S/PMMA 有机玻璃表现出增强的反向饱和吸收（RSA）特性，这归因于石墨烯和 Ag2S 之间的显著协同效应。Ag2S 的单光子吸收（OPA）和石墨烯的双光子吸收（TPA）在 G/Ag2S/PMMA 有机玻璃的 RSA 过程中都起着重要作用。G/Ag2S/PMMA 有机玻璃的有效 NLA 系数βeff 约为 10(3)cm GW(-1)。因此，这种有机玻璃在光限幅器和光快门应用中具有很大的应用前景。
