Zheng Chan, Huang Li, Guo Qiaohang, Chen Wenzhe, Li Wei, Wang Haiyan
School of Materials Science and Engineering, Fujian University of Technology 3 Xueyuan Road Fuzhou 350108 P. R. China
Fujian Provincial Key Laboratory of Advanced Materials Processing and Application 3 Xueyuan Road Fuzhou 350108 P. R. China.
RSC Adv. 2018 Mar 13;8(19):10267-10276. doi: 10.1039/c8ra00390d.
A novel nanocomposite hybrid, carbon quantum dots (CQD)/graphene oxide (GO), which combines the favorable optical properties of both its components, is synthesized by a facile one-step electrochemical method. Transmission electron microscopy, Raman spectroscopy, UV-vis spectroscopy, and fluorescence studies show that the CQDs uniformly attach on the GO surface, which enables highly efficient energy transfer between CQDs and GO. The nonlinear optical and optical limiting (OL) performances are investigated by the open-aperture -scan technique in the nanosecond regime using a laser with a wavelength of 532 nm. The as-prepared CQD/GO composite offers a significantly improved OL performance compared with GO because of the charge/energy transfer process between the CQDs and GO. The main contributors to the enhanced OL effect in the CQD/GO hybrid are a combination of nonlinear scattering and increased nonlinear absorption resulting from efficient charge/energy transfer at the CQD/GO interface.
一种新型的纳米复合杂化物，即碳量子点（CQD）/氧化石墨烯（GO），结合了其两种组分的良好光学性质，通过简便的一步电化学方法合成。透射电子显微镜、拉曼光谱、紫外可见光谱和荧光研究表明，碳量子点均匀地附着在氧化石墨烯表面，这使得碳量子点和氧化石墨烯之间能够进行高效的能量转移。使用波长为532 nm的激光，通过纳秒级的开孔扫描技术研究了非线性光学和光学限幅（OL）性能。由于碳量子点和氧化石墨烯之间的电荷/能量转移过程，所制备的CQD/GO复合材料与氧化石墨烯相比具有显著改善的光学限幅性能。CQD/GO杂化物中增强的光学限幅效应的主要贡献者是非线性散射和由于CQD/GO界面处的有效电荷/能量转移导致的非线性吸收增加的组合。
