Abstarct: In this thesis molybdenum disulfide, titanum oxide and graphene nanocamposites with titanum dioxide were synthesized and evaluated for investigating the effect of photoanode on the performance of dye sensitized solar cells. Structural, elemental composition, surface morphological and optical properties of synthesized samples were studied using XRD, FT-IR, Raman, SEM and UV-Vis. Pastes from synthesized nanoparticles was prepared and were used as photoanode in dye sensitized solar cells devices. In the first stage, TiO2 nanoparticles were synthesized as a main material for the reference cell. The fabricated solar cell was characterizated using solar simulator. X ray diffraction pattern showed the formation of rutile crystal phase and FT-IR and raman spectroscopy confirmed this result. The fabricated solar cell showed an efficiency of about 3.7%. In order to improving the performance of photoanod, flower like nanosheets of molybdenum disulfide were synthesized using hydrothermal method in three different pHs. XRD analysis confirmed the formation of hexagonal crystal structure for this material. Surface morphological studies showed that nanospheres has more regularity and uniformity in pH=9.5 and caused to form a thin film of MoS2 during a one step synthesis process. In the photosensitivity analysis, the sample prepared at pH=9.5 showed a sensivity five times bigger than the sample prepared at pH=2.5. In the last part of this thesis, graphene oxide was synthesized using improved hummers method. FT-IR and Raman spectroscopy analysis confirmed the successful synthesis of graphene nanosheets. Synthesized graphene oxide was added to TiO2 paste in five different weight percentages of 1, 0.1, 0.01, 0.001 wt%. XRD patterns showed the formation of rutile TiO2 and along with graphene peaks. Raman, FT-IR and EDAX results verified the presence of graphene in composite samples. The cell fabricated using 0.001 wt% TiO2/GO showed the highest efficiency of about 3.8%.