Xu Xiujuan, Li Peiying, Zhang Lei, Liu Xuejian, Zhang Hao-Li, Shi Qingzhao, He Baojiang, Zhang Wenjuan, Qu Zhan, Liu Pu
Key Laboratory of Tobacco Flavor Basic Research of CNTC, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China.
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, China.
Chem Asian J. 2017 Oct 5;12(19):2583-2590. doi: 10.1002/asia.201700899. Epub 2017 Sep 8.
Covalent functionalization of reduced graphene oxide (rGO) was performed by using conjugated polymers with different monomers through nucleophilic addition of nitrogen anions to rGO. Three conjugated polymers containing tetraphenylethylene, carbazole, and phenyl groups were used, and as a result of π-π interactions and the "polymer-wrapping" effect, the dispersion stability of rGO was improved. Even if the reaction site in the polymers was the same, there were great differences in the reactivities of the polymers, the dispersion stabilities of the resultant composites, and also the optical limiting (OL) performances of the resultant composites. The differences may be attributed to the π-conjugated structure and steric hindrance of the moiety in the polymer skeleton, which has scarcely been reported. Besides, the resultant rGO-P1 and rGO-P3 materials both showed excellent OL responses, even at 4 μJ. This behavior should enable their potential application in photonic and optoelectronic devices to protect human eyes or optical sensors from damage by intense laser irradiation.
通过使用含有不同单体的共轭聚合物，通过氮阴离子对还原氧化石墨烯（rGO）的亲核加成反应，实现了对rGO的共价功能化。使用了三种含有四苯乙烯、咔唑和苯基的共轭聚合物，由于π-π相互作用和“聚合物包裹”效应，rGO的分散稳定性得到了提高。即使聚合物中的反应位点相同，聚合物的反应活性、所得复合材料的分散稳定性以及所得复合材料的光学限幅（OL）性能也存在很大差异。这些差异可能归因于聚合物骨架中部分基团的π共轭结构和空间位阻，这方面鲜有报道。此外，所得的rGO-P1和rGO-P3材料即使在4 μJ时也都表现出优异的OL响应。这种特性使其在光子和光电器件中具有潜在应用，可保护人眼或光学传感器免受强激光照射的损害。
