Preparation And Photoelectric Transformation Of TiO₂-based Composite Films

As a semiconductor material, TiO2has good photovoltaic effect, low cost and little pollution, and has broad application prospects in solar cells.In this paper, based on the TiO2film preperation by the sol-gel process, elemental Se, graphene oxide (GO) and Polyaniline (PANI) were respectively introduced by solution doping and electro-depositing doping. The Se/TiO2, Se/GO/TiO2and PANI/GO/TiO2composite films as-fabricated were characterized by Scanning Electron Microscope, X-ray Diffraction, Ultraviolet-visible Spectrophotometer. Using xenon lamp as light source, the photoelectric conversion property of composite films was studied. Various effect factors and the mechnism of photoelectric conversion of the composite films were discussed.Main work as follows:1. Preparation and photoelectric transformation of Se/TiO2composite filmFirst, with the Ti(OH)4sol-gel solution via dip-coating and calcining technique, the TiO2film was prepared on the ITO glass plate. Then, the Se/TiO2composite film was fabricated by electro-depositing Se nanoparticles on the TiO2film. By optimizing the condition of electrodeposition, the property of the Se/TiO2composite film was improved. The films as-prepared were characterized by scanning electron microscopy, X-ray diffractometer and UV-Vis spectrometer. The results show that the films are uniform and compact. The TiO2nanoparticles with diameter20nm have anatase phase and Se nanoparticles with diameter60-80nm distributed in the TiO2film homogeneously. The photoelectric experiment results indicate that the Se/TiO2composite film has satisfactory photoelectric transformation property, due to the introduction of Se nanoparticles.2. Preparation and photoelectric transformation of Se/GO/TiO2composite filmFirst, with the Ti(OH)4sol-gel solution containing the GO via dip-coating and calcining technique, the GO/TiO2composite film was prepared on the ITO glass plate. Then, the Se/GO/TiO2composite film was fabricated by electro-depositing Se nanoparticles on the GO/TiO2film. The composite films as-prepared were characterized by scanning electron microscopy, X-ray diffractometer and UV-Vis spectrometer. The results show that the components are uniformly distracted in film. The TiO2particles with diameter20nm have anatase phase, the GO sheets doped in or attached to TiO2film and the Se nanoparticles with diameter60-80nm distributed in the GO/TiO2film. The photoelectric experiment results indicate that the Se/GO/TiO2composite film has satisfactory photoelectric transformation property, by virtue of the co-function of Se and GO.3.Preparation and photoelectric transformation of PANI/GO/TiO2composite filmFirst, with the Ti(OH)4sol-gel solution containing the GO via dip-coating and calcining technique, the GO/TiO2composite film was prepared on the ITO glass plate. Then, the PANI/GO/TiO2composite film was fabricated by electro-polymerizing and electro-depositing aniline (formed as Polyaniline) on the GO/TiO2film. The composite films as-prepared were characterized by scanning electron microscopy, X-ray diffractometer and UV-Vis spectrometer. The results show that the composite films are uniform. The TiO2particles with diameter20nm have anatase phase, the GO sheets doped in or attached to TiO2film and catcnoid PANI deposited in the GO/TiO2film. The photoelectric experiment results indicate that the PANI/GO/TiO2composite film has satisfactory photoelectric transformation property, due to the co-function of PANI and GO.