Preparation And Third-Order Nonlinear Optical Absorption Properties Of Porphyrin/Phthalocyanine Covalently Functionalized Graphene Oxide Hybrid Materials

Due to its excellent performance in the field of laser frequency conversion,optical information processing,and laser countermeasures,nonlinear optical materials have rapidly become a research hotspot,playing a vital role in daily life,defense,and military.At present,the research focus of scientists is mainly on the interaction between strong laser and materials,so as to explore the internal structure,composition and changes of optical properties caused by nonlinear polarization phenomena,and finally to obtain materials with superior nonlinear properties.The porphyrin,phthalocyanine and its derivatives are widely used as a kind of large-scale?-conjugated electron system compounds with delocalization.They are widely used in biochemistry and materials science.Graphene has attracted great attention due to its extraordinary performance in the fields of heat,electricity,mechanics and optics,and has become a hot spot in material research.Graphene materials have better optical limiting properties,but their structural characteristics make them difficult to process and have poor dispersion,which is not conducive to practical applications.Based on this,we prepared graphene nanohybrid materials with valence and functionalization of porphyrin and phthalocyanine by different synthesis methods.The hybrid materials were characterized by various characterizations and their nonlinear optical properties were determined by Z-scan technique.In the second chapter,porphyrin(TPP),metal zinc phthalocyanine(ZnPc)and graphene oxide(GO)are covalently linked to obtain three kinds of hybrid materials,namely TPP-GO,ZnPc-GO and TPP-GO-ZnPc.The porphyrin and metal zinc phthalocyanine were successfully covalently linked to graphene oxide by means of Fourier transform infrared spectroscopy and Raman spectroscopy,etc.The electron transfer between metalloporphyrin,phthalocyanine and graphene oxide was confirmed by UV-visible spectroscopy and fluorescence spectroscopy.Finally,the nonlinear optical properties of hybrid materials were tested and explored by Z-scan technology.The results show that the graphene oxide hybrid materials connecting porphyrin and metal zinc phthalocyanine have better properity than other hybridmaterials and monomers.The superior nonlinear optics corresponds to the synergy between the three components.In the third chapter,porphyrin is reacted with terephthaloyl chloride to obtain polymer 1(COP1),and the polymer is covalently linked with graphene oxide to obtain hybrid material 1(COP1-GO).It was proved by infrared spectroscopy and Raman spectroscopy that polymer 1(COP1)was successfully covalently linked with graphene oxide.Electron transfer between polymer 1(COP1)and hybrid material 1(COP1-GO)was confirmed by UV-visible spectroscopy and fluorescence spectroscopy.Finally,the nonlinear optical properties of hybrid materials were tested by Z-scan technique.The results show that the nonlinear optics of hybrid material 1(COP1-GO)is better than monomer because of the stronger electron and energy transfer between the polymer and graphene oxide.In the fourth chapter,metal zinc phthalocyanine is reacted with terephthaloyl chloride to obtain polymer 2(COP2),and the polymer is covalently linked with graphene oxide to obtain hybrid material 2(COP2-GO).The covalently linked polymer 2(COP2)with graphene oxide was proved by infrared spectroscopy and Raman spectroscopy,etc.UV-visible spectroscopy and fluorescence spectroscopy proved that electron transfer exists between polymer 2(COP2)and hybrid material 2(COP2-GO).Finally,the nonlinear optical properties of hybrid materials were tested by Z-scan technique.The results prove that the nonlinear optics of hybrid material 2(COP2-GO)is superior to monomer,because there is a stronger electron and energy transfer between the polymer and the graphene oxide.