The Electrochemical And Optical Properties Of Graphene/Porphyrin Complexes

Graphene as a new type of two-dimensional carbon material, its special structure and excellent physical and chemical properties of single atomic layer and easy functionalization has been applied in various fields, especially in the photovoltaic materials. Based on graphene as the main research object, this paper respectively in the electrochemical sensor, and form the photoelectric response of composite materials with water-soluble porphyrin aspects are studied. Specific as follows:Chapter 1:Briefly introduces the structure of graphene, synthetic methods and applications in electrochemical sensors, optoelectronic and so on. Introduces the structure and properties of porphyrin reagents, overview the application of porphyrin derivatives in materials and finally summarizes the application of graphene-porphyrin compounds in different fields.Chapter 2:The graphene oxide was prepared using a modification of Hummers and reduction by chemical methods. Graphene was used to obtain graphene modified electrode. The cyclic voltammetry and linear sweep voltammetry was used to study the electrochemical behavior of epirubicin hydrochloride on the graphene modified electrode in pH =4.00 Britton-Robinson buffer solution within-1.0～1.3V (vs.SCE). The results showed that, the modified electrodes can obviously improve the redox peak current of epirubicin hydrochloride. The peak current is linear with epirubicin hydrochloride concentration in the range of 1.0×10-7～1.0×10-6 mol·L-1 (R =0.9923).The detection limit(3S/N) was2.0×10-9 mol·L-1Chapter 3:A metalloporphyrin-trimethylammonio tetraphenyl palladium porphyrin (Pd-TTAP), stable under acidic conditions was prepared, after non-covalent binding with graphene oxide (GO), the composition was characterized by High-resolution transmission electron microscopy(TEM), UV-visible spectroscopy(UV-Vis), room temperature phosphorescence spectra(RTP), Raman and infrared spectroscopy(IR), discovering that electron or energy transfer between the Pd-TTAP and GO can be achieved, and the binding constants of palladium porphyrin and graphene oxide was calculated using Benesi-Hildebrand method. The photoelectric properties of palladium porphyrin and graphite oxide composite materials show good optoelectronic properties.Chapter4:A water-soluble porphyrin-Tetrakis(4-carboxyphenyl) porphyrin (TCPP) was combined with reduction of graphene oxide (RGO) by noncovalent methods, and characterized by UV-Vis absorption spectroscopy, High-resolution transmission electron microscopy (TEM), fluorescence spectroscopy and infrared characterization. The results demonstrated that the hybrid were successfully prepared, can complete the photoinduced electron transfer and energy transfer process. Finally, the hybrid exhibited good electrochemical activity in photoelectrochemical studies, possible way of photoelectric conversion is presented.