Porphyrin edge covalent fused graphene nonlinear nano hybrid material and preparation thereof

Abstract

The invention relates to a porphyrin edge covalent fused graphene nonlinear nano hybrid material and preparation thereof. Diamino porphyrin is in parallel bond connection to the GO edge through condensation reaction, and a third-order nonlinear coefficient of an organic-inorganic hybrid material is enhanced through enhanced electron coupling and transmission effect between the diamino porphyrin and the GO edge. According to the invention, amino porphyrin and ortho-diketone at the edge of GO are subjected to a condensation reaction to form a pyrazine ring, the novel edge-fused organic-inorganic covalent functionalized nano-hybrid material is successfully prepared, and the pyrazine ring enhances the conjugation degree and electron coupling and transmission between porphyrin and graphene; and therefore, compared with a traditional material, the prepared material has more enhanced nonlinear optical performance in the field of nanosecond visible light, and has very strong reference significance.

Description

technical field [0001] The invention belongs to the technical field of organic-inorganic functional composite materials, and relates to a porphyrin edge covalently fused graphene nonlinear nano-hybrid material and its preparation. Background technique [0002] In the existing graphene-porphyrin nano-hybrid material system, the third-order nonlinear scattering of graphene caused by laser thermal effect, the reverse saturation absorption of porphyrin monomer, and the transition from electron donor porphyrin monomer to graphene More and more work revolves around modifying the way porphyrin and graphene are connected. By changing the connection mode of graphene and porphyrin, the process of electron / energy transfer can be changed, which leads to the third-order nonlinear optical properties of porphyrin monomer graphene nanohybrid materials. At present, there are many reports on changing the connection method between porphyrin monomer and graphene, which can be summarized as fol...

AI Technical Summary

Problems solved by technology

[0005] 3. Free radical addition reaction: Free radical addition reaction occurs more on the surface of graphene, and a molecule of nitrogen gas is removed through amino azo salination, and the formed free radicals attack the sp on the surface of graphene. 2 Hybridized carbon atoms, the graphene and porphyrin monomers in the hybrid material system formed are in a vertical state, and the porphyrin monomers are planted on the "graphene" land like saplings. This direction has relatively low requirements for graphene , does not require oxygen-containing groups, so it is suitable for pure graphene and reduced graphene oxide systems, the disadvantage is that the loading yield is relatively low

[0009] Through observation and summary, it can be found that the configurations between the components of the porphyrin monomer and graphene nano-hybrid materials prepared by the above method are relatively uniform. The edge of graphene, the main body of graphene and the porphyrin monomer are connected by a single line, especially the nano-hybrid material that is further combined with the substitution reaction through this type of reaction, because the bridge is too long and belongs to the flexible bridge connection group, so The porphyrin monomer is similar to the "balloons" tied to the edge of the porphyrin. The position of the porphyrin monomer is very unstable, so the electron / energy transfer of the porphyrin monomer to graphene depends on the single-line transmission of the bridging group. , on the other hand, through the coiling of the flexible chain, it is possible for a part of the porphyrin monomer to have a π-π-stacking effect with the graphene plane again, so that the electron / charge transfer similar to the supramolecular structure occurs, and the electron / energy transfer Efficiency has been shown to be inferior to the transfer effect of covalent linkage

The second type is through free radical addition reaction, 1,3-dipolar cycloaddition reaction and click chemical reaction as the main body to carry out ring-opening reaction above the plane of graphene. Compared with esterification reaction, The acylation reaction has better electron / energy transfer efficiency, but the current research on this kind of material has stayed in these two types of reaction systems, and a single single-wire bridging method has been unable to improve the efficiency of electron transfer inside the material, so as to further optimize Its third-order nonlinear performance

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