关键词: 石墨烯, 酞菁, 非线性光学

Abstract:

A method for preparing a graphene oxide-phthalocyanine composite material via solvent which can be applied to laser protection was proposed. The chemically prepared graphene and graphene oxide were loaded on phthalocyanine, and the morphology and structure were characterized by a series of technical means such as scanning electron microscope (SEM), Fourier infrared spectroscopy (FTIR), Raman spectroscopy and thermogravimetric analysis (TGA). UV-vis was used to investigate its UV absorption and dispersibility in organic solvents, and then the open aperture Z scanning technology was applied to investigate nonlinear optical properties. The results of the characterization technology showed that the method of concentrated sulfuric acid solvent can successfully made graphene and graphene oxide composited with phthalocyanine. Then the higher the concentration of concentrated sulfuric acid, the more stable the grafting structure would be. The application of the composite material indicated a significant reverse saturation absorption response. The non-linear transmittance of phthalocyanine-chemical graphene was reduced to 45.5%, which was 39.1% lower than that of phthalocyanine. The reverse saturated absorption coefficient of phthalocyanine-graphene oxide was increased to 74.6cm/GW with an increase of 57.1%. If the phthalocyanine was provided with more grafting sites via substrate and solvent environment during the preparation process, the obtained composite material can exhibit a higher reverse saturation absorption coefficient and a lower optical limiting threshold at a higher incident energy, which had certain guiding significance for researching graphene and phthalocyanine in the technical field of nonlinear optical composite materials.

Key words: graphene, phthalocyanine, nonlinear optical