Preparation And Properties Study Of Porous Ordered Photoelectric Function Material Film

With the rapid development of science and information technology, micro / mesoporous / macro porous materials have become a challenging hotspot in the field of materials chemistry, which is also experiencing an explosive development process. In the application of catalytic and separation nano-porous materials has been studied widely. Except for those traditional fields such as adsorption and catalytic applications, nano-porous materials in the application of electromagnetic field are also becoming more and more important. Research found that some transition metal oxides have a good photoelectric chemical behavior which has good potential in application.Colloid crystals as a template of the three DOM photonic crystal material is the most potential material. When large-diameter balls appearance with a match, in which the light transmission in Bragg diffraction, resulting in the wavelength range of light are prohibited passed, that produce the band gap. This feature enables the three DOM-control materials in molecular and atomic spontaneous emission control technology an important application. Macroporous / mesoporous / porous composite materials greater extent the use of the porous material. They are also becoming the new hotspots of research. In this paper, a different size of polystyrene microspheres as a template was synthesized firstly, and then accessed through the membrane pore size of different ways, neat, highly ordered porous film. The surface photovoltaic properties and traientphotovoltaic properties of different porous ZnO and TiO2 films, meanwhile, the schematic diagram of some routes that oxygen capture electrons in ZnO thin film and Azo- ZnO hybrid film is also analyzed.The main results are illuminated as follows:1. The respective particle size of 800 nm, 400nm, 200nm polystyrene microspheres were synthesized by sol-gel method, the aim is to use polystyrene microspheres as a template of porous films. Polystyrene microspheres particle concentrations when the initiator of the changes has occurred in the increase, it also affects colloidal dispersion coefficient.2. A diameter of 400 nm and 800nm polystyrene microspheres as a template, the film are neat, highly ordered, Aperture 400 nm respectively, 800nm porous ZnO thin film. Its surface photovoltage test: The results show that in the 300-500 nm range there is a very clear photovoltaic response.In the transient– photovoltage tests, we found that there are two processes of time for porous ZnO thin film , we believe that the first process is generated by the self-built field, and the second one is generated by the proliferation of nano-particles. In comparison we can see that the balance speed of electron and hole in the 400 nm film is faster, so the maximum of photoelectric response time (tmax) earlier. The 800 nm porous ZnO film having a negative signal may be caused by surface states. The schematic diagram of some routes that oxygen capture electrons in ZnO thin film and Azo- ZnO hybrid film is also are discussed: The results show that in the absence of UV irradiation, the heterogeneous material ZnO material than that of pure material has a higher carrier concentration, as azo pigments to the electronic role. Therefore, the heterogeneous material higher than that of pure ZnO owning to the gas sensing. When UV irradiation, the heterogeneous material on the oxygen sensitivity higher than that of pure ZnO about 500 times, we inferred that the heterogeneous material at this time than pure ZnO should have contained higher carrier concentration.3. 400 nm and 800nm porous TiO2 films were prepared by the same method. After the Surface photovoltage test: The results showed that the absorption band edge of the pore of 400 nm and 800nm of TiO2 film are 368 nm, 370nm, respectively. The corresponding ban bandwidths are 3.36 eV, 3.35eV, respectively. We found the absorption band edge which is correspondent with experienced red shift. It is because the heating cause the TiO2 particles larger. In the transient-photovoltage test, we found that both the up-irradiation and under-irradiation, the light responses are positive. The positive photovoltage response means holes generated by lights are concentrated in the vicinity of positive electrodes.