Study On The Enhancement Of TiO₂ Photoelectric Properties Of Au Nanoparticles

In this work, the Au@C core shell ball spheres were prepared by hydrothermal method, and the effects of solution concentration and reaction temperature on the morphology and size of Au core were studied. Select the prepared Au@C core shell type ball, TiCl4 coated with TiO2 and annealed to form Au@TiO2 ball, with the Au@C core shell type ball as the template, the Au/TiO2 fiber with larger length diameter ratio and the cavity structure containing Au nanoparticles were obtained by the electrostatic spinning combined with the thermal annealing method. Because the visible plasmon resonance of Au nanoparticles, the UV-vis absorption spectra of the obtained materials show that the absorption peaks of the Au/TiO2 financiers and Au@TiO2 are obvious at 580nm. Au/TiO2 nanofibers compared with pure TiO2 nanofibers, and the Au@TiO2 spheres compared with pure TiO2 spheres were also found to have a higher absorption coefficient in the visible band, at the same time, because of the unique structure of the fiber, the specific surface area of the fiber is increased, so we study the photoelectric detection and photocatalysis performance. Because of the carbon nanotube (CNT) in the visible and near infrared region has stronger photoelectric response, and also has strong physical adsorption properties which were easy to prepare composite materials. In order to improve the photoelectric response rate, we choose CNT powder and Au/TiO2 fiber, TiO2 fiber, Au@TiO2 ball and TiO2 ball to constitute the core material of the photoelectric detector. And light irradiation with 375nm,532nm,785nm and 1064nm, the results show that the Au nanoparticles modified TiO2, after UV irradiation, compared to pure CNT materials show a negative photoelectric response, the composite material in the UV light shows the positive photo conductivity. In addition, the composite materials in the visible light and infrared region of the photoelectric response are improved compared than pure CNT materials. The photocatalytic rate of Au/TiO2 nanofibers were also significantly higher than that of pure TiO2 nanofibers.