Preparation And Photoelectric Properties Of Ordered TiO₂?ZnO Nanotubes And Their Coaxial Heteronanotubes

UV detectors have been widely used in various fields,such as environmental monitoring,medical,biological,military and so on.New UV detectors are required to be small,portable,easy to process,high switching current ratio,fast response recovery time,and low manufacturing cost.It is good candidates that wide band gap metal oxide semiconductor materials.The reason is that the wide band gap material itself does not absorb visible light,and can achieve efficient absorption of ultraviolet light.Compared with narrow band gap materials,it can reduce the use of filters and save costs.In addition,there are many wide band gap metal oxide semiconductor materials,such as TiO₂,ZnO,NiO,SiC,CaN,etc.These materials have stable physical and chemical properties and have attracted the attention of many researchers.The main work of this article is as follows:1.Firstly,an ordered nanowire carrier was successfully synthesized by electrostatic spinning,and then PVP/Ti composite nanowires of different sizes and diameters were prepared by controlling the deposition time of the target by pulsed laser deposition.The deposition time was 6min,12min,18min and 30min.Then oxidizing and sintering in a tube furnace for 2 hours can obtain anatase phase TiO₂ nanotubes with different wall thicknesses.The photoelectric response results show that the sample deposited for 18 min shows the maximum light sensitivity and fast response recovery time.2.Large-area ordered ZnO nanotubes and rutile TiO₂ nanotubes were successfully prepared by the above method.Among them,ZnO nanotubes showed poor response to ultraviolet light.Because the coaxial heterojunction can greatly increase the interface area,improve the separation efficiency of photo-generated carriers and suppress the recombination probability of electron-hole pairs,this paper starts from constructing a heterojunction structure to improve the photoelectric performance of ZnO nanotube set off,ZnO/TiO₂coaxial heterojunction nanotubes were successfully synthesized and the device showed good UV response.On this basis,as it is found that the temperature has a significant effect on the UV response performance of the heterojunction device,this article further measured the photoelectric performance of the heterojunction device at an ambient temperature of 90°C.The results show that The UV photoelectric performance of the device has been greatly improved compared to room temperature.