Preparation, Characterization Of Graphene/Phthalocyanines Hybrid Based On Diazonium Compounds Functionalized Graphene

Graphene is a hotspot and frontier of material because of its outstandingproperties in various field such as optical, electrical, magnetism, mechanical and et al.The graphene dispersion is metastable state with the poor concentration and the slimchanges of solution polarity or pH value will make the aggregation of graphene,because there is not any groups bond on the surface of graphene. However, its widerapplications are impeded by the diffculties in opening a bandgap in its gaplessband-structure, as well as the lack of processability in the resultant intrinsciallyinsoluble material. So, functionalization of graphene by covalent is necessary, for onething the dispersibility of functionalized graphen is improved and the functionalgroups bond on the base plane of graphene give platform for further reactions.Graphene dispersion was prepared by the methods of reduced graphene oxide andliquid phase exfoliated from microcrystalline graphite respectively. Subsequently, thegraphene functionalized with diazonium salt in order to improve the dispersibility andgives the plantform for the functionalization of graphene by covalent. The benzoicacid functionalized graphene was covalent bond with Pc to fabricate the graphene/Pcnanohybrid, and the material exhibits excellent nonlinear optical (NLO) performance.Carbon nanoscrolls were obtained though the heat treatment of graphene for thepurpose of expand the application of its. Below shows the details of this study:(1) In the present work, the functionalization of reduced graphene oxide (rGO)by phenyl carboxylic diazonium salt (BFrGO) and the subsequent attachment of asymmetrically substituted metal-free phthalocyanine (BFrGO-Pc) via amide reactionare described here. The obtained hybrid was well dispersed in polar solvent with theconcentration was up to4mg/mL. And the wt%of phthalocyanine in the resultingproduct was found to be up to25%.(2) Graphite is processed with the mixture of benzene derivative and NMP, andthen intercalated graphite compounds were obtained, subsequently the intercalatedgraphite was sonicated in polarity solvents for several hours to prepare g raphenedispersion. We also conducted the graphene dispersion in the mixture of benzenederivative and NMP for the sonication of5-8hours. We found that the grapheneprepared by this method with single/muitlayers, larger size and good quality.(3) An efficient and convenient method is applied to introduce varieties of simple functionalities onto the graphene surface for the bulk preparation. Diazoniumcompounds functionalized reaction is demonstrated and it successfully prevented theaggregation of graphene for which providing solubility in high polar organic media oreven in volatile solvents such as ethanol and acetone. This approach is complementedby the phenyl carboxylic diazonium salt functionalized graphene (PCFG) attachmentof a symmetrically substituted metal-free phthalocyanine (PCFG-Pc) using the amidereaction, which is used for the covalent introduction of a complex phthalocyaninemolecule.