Synthesis,Characterization And Photoelectric Properties Of Novel Ru(?)/GO Nano-composite

Dye sensitized solar cell(DSSC)have attracted more and more interest due to its high efficient utilization of sunlight,low cost and environment friendly.People mainly focused on developing excellent photoelectric transfer semiconductor which can be used as photo-anode or photo-cathode materials,very important components in DSSC.Recently,graphene oxide and functionalized graphene oxide as a novel carbon material have absorbed much attention in many fields,but the studies on the dye-sensitized graphene oxide are still few.In this thesis,two new Ru(?)/GO nano-composite were synthesized successfully and investigated,aiming to develop an highly effective dye-sensitized semiconductor for DSSC.Firstly,ligand bpy-AN were prepared by introducing a diazo-2-naphthanol group to 2,2'-bipyridine,and then two complexes Rul and Ru2 containing ligand bpy-AN were synthesized.Their structures and optical properties were characterized by FT-IR,1H NMR,MS,elemental analysis,UV-Vis absorption spectrum and fluorescence spectrum respectively.In the 'H NMR spectra,the OH proton of 2-naphthol in complex Rul and Ru2 was also found at ? 15.7 ppm,which indicate that the strong intramolecular hydrogen bonds exist in these two complexes.Comparing their UV-Vis spectra to that of Ru(bpy)3+,a redshift of the MLCT band with 58 nm for Rul and 83 nm for Ru2 were determined respectively and wider wavelength ranges and higher molar extinction coefficients were also found.From their fluorescence spectra,no emission was found for complex Rul and complex Ru2.It means that the emission of the Ru(?)center was quenched by an electron transfer or energy transfer process after the introduction of diazo-2-naphthol group complex.Secondly,the above two Ru(?)complexes were used to modify graphene oxide and two novel nano-composites Rul/GO and Ru2/GO through non-co valent method were obtained respectively.Their structures was characterized by FT-IR,UV-Vis absorption spectrum,XRD and Zeta potential etc.A large redshift of the MLCT band of the Ru(?)complex were found after being adsorbed on the surface of graphene,which can be attributed to the strong,?-? interaction between Ruthenium(?)molecules and the surface of graphene oxide.Finally,the photoelectrical response measurements were performed.The photo-induced electron transfer property of these two composites was characterized by using a photoelectrochemical cell.Obvious and stable photocurrent response was observed under visible light illumination.This results showed that there was electron transfer from Ru(?)to GO under illumination.Thus,the photoelectrical response measurements reveal that these two composites all may act as an efficient photoelectric conversion material for optoelectronic applications.