Preparation,Characterization And Photoelectric Properties Of Dye-sensitized Graphene Oxide Composites

Dye-sensitized solar cells(DSSC)as one of the efficient ways to use solar energy have been widely studied.High-performance photoelectric conversion materials as electrode are very important for DSSC.In recent years,graphene oxide(GO)as a novel carbon material has absorbed more and more attention.It can be modified with photosensitizers through covalent and non-covalent methods to obtain different kinds of GO composites with photoelectric conversion properties.In this paper,three kinds of dye-sensitized graphene oxide composites were synthesized through covalent or non-covalent method.Their structures and photoelectric properties were studied in detail.Composite la-GO was obtained by non-covalent method through utilizing the ?-?absorption and electrostatic interaction between the molecules and the GO sheet.Composite 1b-GO were synthesized by amidation reaction between amino group of the ruthenium complex and carboxyl group of GO.These two ruthenium complexes modified GO composites were characterized by FT-IR,UV-VIS spectrum,XRD,TEM and Zeta potential measurement.A 37 nm and 18 nm redshifts of the MLCT band of the complex 1a and 1b were found respectively after being adsorbed on the surface of graphene,which can be attributed to the strong ?-? interaction between the molecules and the surface of graphene oxide.Composite 1b-GO was further modified with a cationic zinc phthalocyanine complex and a new multi-dye-sensitized GO composite was obtained through utilizing the ?-? absorption and electrostatic interaction between the phthalocyanine molecules and the GO sheet.Its structure and optical properties were characterized by FT-IR,UV-VIS spectrum,XRD,TEM and Zeta potential measurement.Finally,the photoelectric response measurements were performed.The photo-induced electron transfer properties of these three composites were characterized by using a photoelectrochemical cell.All of them gave obvious photocurrents under visible light illumination.These results reveal that these three composites all can act as efficient photoelectric conversion materials for optoelectronic applications.