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Covalent Functionalization of Graphene by Nucleophilic Addition Reaction: Synthesis and Optical‐Limiting Properties
Author(s) -
Xu Xiujuan,
Li Peiying,
Zhang Lei,
Liu Xuejian,
Zhang HaoLi,
Shi Qingzhao,
He Baojiang,
Zhang Wenjuan,
Qu Zhan,
Liu Pu
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201700899
Subject(s) - conjugated system , covalent bond , graphene , polymer , tetraphenylethylene , surface modification , carbazole , materials science , moiety , photochemistry , monomer , steric effects , dispersion stability , oxide , nucleophile , polymer chemistry , chemical engineering , chemistry , nanotechnology , organic chemistry , composite material , fluorescence , physics , catalysis , quantum mechanics , engineering , metallurgy , aggregation induced emission
Abstract 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.