Sol - Gel Prepared Vanadium Pentoxide Film Material And Its Performance Research

In this paper, the present situation of the research of V2O5 thin film as functional material has been reviewed. We reported the inorganic sol-gel preparation technology of V2O5 thin film, the organizational structure and performance were studied by SEM, XRD, U-V spectrum, CV and so on. The main points are summarized as follows:With the improved inorganic sol-gel method, the influence of structure and performance on the preparation of V2O5 sol and V2O5 thin films with experimental conditions were investigated. The results showed that the performance of the V2O5 sol system prepared by the electromagnetic combined ultrasonic agitation modes was good. Which promoted the refinement of the grain. After annealing treatment, the investigation from XRD reveals that different oriented V2O5 thin films were prepared on different substrates.Using dip-on technology,V2O5 thin film deposited ITO conducting glass substrate formed withβ-V2O5 structure. On the other hand,γ-V2O5 thin film was formed on the slides substrate. The formation of two structures were ascribed to the different adhesion and internal stress of different substrates. Meanwhile, since the dynamics and thermodynamic stability of the film has been changed by the annealing treatment, the structure of the film was prior to be changed. Using electrophoresis deposition technology, When the voltage is 15V, the structure of the thin film isα-V2O5. But if the sedimentary voltage is 20V or 25 V, the thin film has both structures ofα- andβ-V2O5.The investigation from U-V spectra reveals that:in the area from 350nm to 420nm,α-V2O5 thin film has the highest absorption rate,β-V2O5 thin film is the second,γ-V2O5 thin film has the lowest absorption rate. These results may be related to the structure of the film and preparation methods. In the area with the light wavelength longer than 550nm,γ-V2O5 thin film has highest transmittance rate reached 77%,α-V2O5 structure around the minimum, only 56 percent or so, different structure of V2O5 thin film transmission rate change basic similar.The test results about cyclic voltammograms of V2O5 thin films prepared by different sedimentary voltage are shown as below. The asymmetrical oxidation/reduction peaks appeared with the testing on V2O5 thin films prepared under different preparation methods, because the embedding and de-embedding of lithium ion is a heterogeneous reaction process generating different phases of vanadium bronze.The results of cyclic voltammograms show that the Li+ can embed/de-embed in V2O5 thin film on ITO conducting glass substrate.The preparation process and optical properties of V2O5 nanowires were studied. Through the control of heat treatment mechanism, aβ-V2O5 nanowire had formed after 500℃heat treatment on the V2O5 thin films with ITO conducting glass substrate.The preparation of V2O5 nanowires withβ-V2O5 structure is without high temperature and high pressure. Also the equipments and process are simple. The study is reference valuable to the investigation about the preparation of V2O3 nanowires. The U-V spectrum analysis shows that V2O5 nanowires have approximately the same transmission rates after 400℃and 500℃heat treatment. But with the increasing temperature of the heat treatment, the transmittance rates of V2O5 nanowires are decreased.