Intelligent Laser Protection Materials:Synthesis And Properties Of The Vanadium Oxide Thin Films

With the rapid development of laser weapons, looking for new materials in the field of laser protective effective against blinding laser weapons, to protect the optical detector and optical system of individual soldiers and military equipment from the devastating blow, has becomeplaced in the national military technology researchers in front of the very real problem.As a high performance intelligent material, Vanadium oxide has a reversible transition from low-temperature semiconductor phase to high-temperature metal phase at certain phase-transition, accompanied by an abrupt change in photoelectric characteristic. Therefore, Vanadium oxide has great potential for the application in laser protection, thermoelectric switch, etc. While its practical application is blocked seriously by the problems like the complication of material system and high phase transition temperature of pure vanadium oxide.In this paper, amorphous V2O5thin films were deposited on glass substrates by reactive dc magnetron sputtering. After the annealing treatment under certain temperature range of O2atmosphere, the P-phase V2O5nanorods were synthesized. The effect of temperature on crystal structure and optoelectronic properties of β-phase V2O5nanorods was studied by SEM, XRD, self-made resistance-temperature measurement system and so on. The result indicates that V2O5nanorods have high temperature sensitive characteristic within a narrow temperature range. In room temperature, the sample shows high absorptivity in the ultraviolet and the near-ultraviolet region, as well as high transmittance in near infrared region. The sample annealed in500°C caused two orders of magnitude in high and low resistance, and the phase-transition temperature was about350°C.At the same time, the representative preparation methods and their merit and demerit are reviewed in this paper, with an emphasis on the application prospect of vanadium oxide thin film in intelligent laser protection weapons. The effects of different doping methods and different impurity upon the phase transitions, temperature hysteresis, optical and electrical properties are also summarized.