Synthesis And Properties Of Molybdate And Vanadate Functional Nano/micro Materials

Micro/nanomaterials have been attracting a great research interest around the world due to the unique physical and chemical properties. These materials play an important role in the practical application, such as phosphors, photocatalysis, sensors as well as microelectronics. Micro/nanosphere, micro/nanoribbons and micro/nanowires are a new class of low dimensional materials, which show different properties, respectively. Recently, the MoO4/VO4 arouses wide concern because these materials present excellent performance in the fields of fluorescence, photocatalysis and gas sensor. In this paper, the fluorescence spectra of Eu3+ doped BaMoO4 and LaVO4, and the photocatalysis of AgVO3 nanowires were studied in detail. The main works can be summarized as follows:(1) The BaMoO4:Eu3+red phosphors have been synthesized by a solid-state method. The SEM images of Ba MoO4:Eu3+ reveal the diameter of the dispersed microsphere are about 2 ~ 4 μm. The phosphors emit strong red light around 613 nm excited by 394 or 464 nm which is close to the emitting wavelength of commercial GaN-based chips. We carefully investigated the fluorescence spectrum with various Eu3+ concentrations. It results that these phosphors with the Eu3+concentration of about 6 % present the best fluorescence property. The CIE chromaticity coordinates are close to NTSC standard values. In the meanwhile, the fluorescent properties of LaVO4: Eu3+ prepared by a hydrothermal method was also investigated. The grain size of LaVO4:Eu3+ phosphors are around 20-30 nm. The phosphors emit strong red light around 613 nm excited by 465 nm(2) The AgVO3/AgVO3 nanowires with different morphology were synthesized by a typical hydrothermal method. It was found that there are many nanoscale Ag particle in-situ synthesized on the nanowires surface by controlling the p H values and reaction time. Furthermore, the Surface Plasmon Resonance(SPR) was simulated by FDTD solution, which results the enhancement electric field on the nanowire surface and wavelength broadening of absorption light. These results may find potential application in photocatalysis. The photocatalytic activities of AgVO3 and Ag/AgVO3 were investigated using basic fuchsine(BF) dye. The experiment results show the Ag nanoparticle is beneficial for valence band electrons to enhance the photocatalysis efficiency.