Development And Characteristics Of The Infrared-sensitive Material

VO₂ is a kind of phase-transition type material, with the enhancement of temperature, it changes from monoclinic to rutile structure at 68°C. Meanwhile, physical properties such as electrical resistance, magnetic susceptibility, optical index of refraction transmission and reflectivity have significant variation, which leads to a broad range of potential application in many fields. Recently, VO₂ film has been applied for solar temperature controller in buildings, photoelectric switch, erasable optical storage device, protective device for laser destructible weapons, and modulator of microwave radiation et al. With the rapid development of nano technology, there is a new way for the preparation of VO₂ material in nano size which has been found to possess better physical properties such as the dramatic decrease of stress during phase transition and significant increase of resistance variety and optical index of light transmission. Compared with VO₂ film material, nano-VO₂ material is more convenient to fabricate large area uniform film especially doped in polymer matrix. Accordingly, study focusing on the preparation and property of nano-VO₂ composite is of great importance in theoretical and practical field.Infrared detection technology is widely used in both military and civilian fields as infrared control and guide, laser radar, infrared imaging, remote sensing, spectral detection, industrial inspect, atmosphere environment monitoring. Therefore, a lot of attention has been paid to improve the performance of the core part in infrared detection technology-infrared detector all over the world.In the first part of this work, using chemical oxidation method the preparation of poly(3,4-ethylenedioxythiophene) (PEDT) film has been described. The electric resistance and temperature characteristics was measured, and film morphology was investigated by scanning electron microscopy (SEM), which paves the way for the device application of nanoVO₂-PEDT film.Then, using liquor blend method nanoVO₂-PEDT film was fabricated and characterized by TCR method. It shows that the composite film has one order of magnitude resistance change between 35 and 45°C, which corresponds to the typical...