In the past decades, significant effort has been invested into the research and development of optical limiting materials and processes in order to develop practical solutions for the protection from laser beams. In this study, a new soluble graphene oxide based material (GO-Cz) has been synthesized through the covalent modification of graphene oxide (GO) with a carbazole derivative (Cz). The formation of an amido bond between the Cz group and GO has been confirmed by X-ray photoelectron and Fourier transform infrared spectroscopy. At the same concentration, both the nonlinear extinction coefficient and the imaginary third-order susceptibility were increased by a factor of ≈6.93 at 532 nm and ≈6.07 at 1064 nm relative to those of GO, as a result of the covalent grafting of the Cz moieties onto the GO surface. The GO-Cz dispersions exhibit a much better optical limiting performance than GO and GO/Cz blends at both 532 and 1064 nm due to the possible intramolecular electron-transfer between the GO and Cz moieties and the effective combination of the different nonlinear optical mechanisms.
High intensity laser beams can cause the atoms that make up retinal tissue to be completely torn apart to form a highly unstable plasma. Functional materials for laser protection are an extremely important research field for the safety and security of users. In their Full Paper on , B. Zhang, Y. Chen et al. describe a new, soluble graphene oxide (GO) based material that was covalently functionalized by an amidation reaction with a carbazole (Cz) derivative. At 532 and 1064 nm, the new material exhibits a larger absorption coefficient than GO and a better optical limiting performance than GO and GO/Cz blends due to the possible intramolecular electron‐transfer between the GO and Cz moieties and the effective combination of the different nonlinear optical mechanisms.
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