Synthesis Cationic Porphyrin-graphene Composites And Research Spectral Properties

Graphene has highly conjugated structure and excellent electrical properties, as an good electron acceptor followed close by researchers. Porphyrin has a strong visible light absorption and electron-rich properties as a dye-sensitized of photochemical stabilityl, it also a good electron donor. In recent years, A stable noncovalent graphene/porphyrin composite was prepared thorough π-π stacking and electrostatic interactions become a hot topic, these composite has extensive application prospectin such as optoelectronic materials, analytical sensing, photodynamic therapy and so on.Therefore, in-depth study of spectroscopic properties of composite material has great significance for ascertain its formation mechanism and influencing factors. On the basis of previous studies, we have been researched in the following three areas:First, spectroscopic properties of graphene/porphyrin influenced by graphene oxide with different degrees of reduction has been studied. The GO, GO/TPPyP composite and its interaction process with metal ions have been revealed by X-Ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectrometer(FT-IR), atomic force microscope(AFM) and ultraviolet-visible absorption spectrometry(UV-vis). The results suggested that the flatting of TPPyP molecules was regulated by GO with different degrees of oxidation in the composite. Furthermore, the coordination of porphyrin with different kinds of metal ions can be altered by graphene oxide with different degrees of reductionSecond, Electronic effect(π-π conjugated) is one of the key factors induced grapheme/porphyrin composite UV absorption bathochromic shift, confirm the truth by changing the substituents of porphyrin. The results suggested electrostatic interaction, cationic pyridine ring twisted and electronic effect together inducedgrapheme/porphyrin composite UV absorption bathochromic shift.Third, preliminary exploration of the doping of graphene affected the spectral properties of grapheme/porphyrin composite, found that different amount of nitrogen(sulfur) incorporation can be chang potency of graphene with porphyrin.