TiO₂ Nanorod Array Structure Regulation And Its Photoelectric Properties

Environment and energy are one of the major issues facing the world at present.Advanced clean energy technologies need to be studied and developed urgently.Metal oxide semiconductor materials represented by titanium dioxide?TiO₂?have excellent chemical stability,appropriate energy band structure,abundant raw materials,low cost and other excellent characteristics,and have an attractive prospect of wide application in energy and environmental fields.Focusing on the growth and structure regulation of TiO₂ nanorods array,this paper explored the basic research of its application in both photoelectrochemical and field emission,and realized the research and development of TiO₂ nanorods with excellent photoelectrochemical characteristics.The main work is as follows:?1?The growth of highly directed TiO₂ nanorods was realized by hydrothermal method,and the ZnO surface modification of TiO₂ nanorods was realized by atomic layer deposition technology with ZnO@TiO₂ heterojunction nanorods.The results of the photoelectrochemical properties show that the current density of the structure can reach 1.24 m A/cm²,which is 45%higher than that of pure TiO₂ nanoarray.The enhancement of its photoelectrochemical properties is mainly attributed to the build in electric field generated by the constructed ZnO@TiO₂ heterojunction,thus achieving the effect of improving the separation and transport of photogenic carriers.?2?On the basis of highly directed TiO₂ nanorods,the growth of dendritic TiO₂nanorods was achieved by chemical deposition.The results of the study on its photoelectrochemical properties show that the array has excellent photoelectrochemical properties,and the current density is up to 1.68 m A/cm²,which is the highest value of raw TiO₂ semiconductor photoelectrochemical properties reported so far in the world.The enhancement of photoelectrochemical properties is mainly attributed to the higher specific surface area?enhanced light absorption?brought by the dendritic nanoarray structure and the better photogenic carrier transport path?enhanced photogenic carrier transport?given to the photocatalytic anode by the highly oriented single crystal nanorods.?3?On the basis of dendritic TiO₂ nanorods array,the dendritic TiO₂ nanorods array modified with Au nanoparticles were prepared by ion magnetron sputtering.The results show the turn-on field could be 1.61 V/?m and current density could be?4.95 m A/cm²,respectively,both of which are the state-of-the-art ones among the TiO₂ field emitters ever reported.Their synergistically improved FE characteristics can be mainly assigned to profoundly increased electron emission sites caused by the grown sharp branches and decorated Au NPs.The limited field screening effects with reduced work function caused by the well-aligned nanoarrays configuration and decorating Au NPs with tailored densities also favor the emitters with improved FE performance.