Preparation And Photoelectric Properties Of Tungsten Trioxide Composite Films

With the gradual depletion of traditional fossil energy sources and the increasing global environmental pollution problems,people are constantly seeking new energy-saving materials and new,sustainable,renewable green energy sources.WO₃ is a very typical transition metal oxide semiconductor material.It exhibits special optical,electrical and mechanical properties due to its valence diversity and unique valence electron configuration.WO₃ has shown excellent performance in the fields of electrochromism,catalysis,gas sensors,supercapacitor and solar cells.It will have great development and application prospects as the energy-saving material and the clean energy material in the future.In this paper,WO₃ material is the main research object.A series of composite films based on WO₃ were prepared by stacking and co-sputtering methods using Radio Frequency magnetron sputtering technology.The effect of laminate thickness and sputtering power on the optoelectronic properties of WO₃ films was investigated.The specific research contents are as follows:?1?The film samples were prepared by Radio Frequency magnetron sputtering using ITO conductive glass as the substrate.TiO₂/WO₃ composite films with different thickness of TiO₂ film layer were prepared by lamination method.We tested and analyzed the effect of the thickness of the TiO₂ film layer on the transmission spectrum and electrochromic properties of WO₃ film.The superposition of TiO₂ film layer successfully improved the electrochromic stability of WO₃ film.The optimal superposition thickness of the TiO₂ film layer was determined by experiments.We successfully obtained 1.7-fold ion diffusion coefficient enhancement and the electrochromic stability was improved by more than 2 times.?2?WO₃ films with suitable thickness were deposited on glass substrate by Radio Frequency magnetron sputtering.Cu₂S film layer was deposited on the WO₃film layer which was heat to prepare Cu₂S/WO₃ composite film.Cu₂S/WO₃composite films with different thickness of Cu₂S film were prepared by controlling the thickness of Cu₂S film.We used methylene blue as a simulated pollutant to test the photocatalytic performance of the Cu₂S/WO₃ composite films.We tested and analyzed the effect of the superposition thickness of Cu₂S layer on the light transmission and photocatalytic activity of WO₃ film.The superposition of Cu₂S film layer successfully improved the photocatalytic activity of WO₃ film.The optimal superposition thickness of Cu₂S film was determined by experiments,and We successfully obtained 2.14-fold photocatalytic reaction coefficient enhancement.?3?WO₃:TiO₂ composite film samples were prepared by dual targets co-sputtering method.WO₃:TiO₂ composite film samples with different sputtering power ratios were prepared by changing the sputtering power of TiO₂ and maintaining the sputtering power of WO₃ steady.Then the samples were heat treated.We studied the changes of WO₃ film on morphology and structure due to the incorporation of TiO₂.The addition of TiO₂ not only greatly improved the thermal stability of the WO₃ film,but also made it easylly crystallize at a lower temperature.We used methylene blue as a simulated pollutant to test the photocatalytic performance of WO₃:TiO₂ composite film.The addition of TiO₂ enhanced the photocatalytic activity of WO₃ film.We determined the optimal sputtering power of TiO₂ through experiments.The best photocatalytic degradation efficiency of methylene blue was as high as 72%,showing a high application potential.