13929258449

admin@satnano.com

Blog

Home

Blog

Vanadium dioxide-a revolutionary material for the electronics industry in the future

May 12,2021.

Vanadium dioxide (VO2) is a binary oxide with a strongly correlated electronic system. Due to the strong interaction of its internal electrons, orbits, crystal lattices and spins, local electronic and crystal structure changes caused by small external stimuli can be sufficient. Induce VO2 to undergo a reversible metal-insulator phase transition. Along with the phase change, the crystal structure, resistance, infrared light transmittance, refractive index, and magnetic susceptibility of VO2 change drastically. It is precisely because of the near-room temperature phase transition temperature of VO2 and the sudden change of physical and chemical properties before and after the phase transition, it has a very broad application prospect in electronics, military affairs, and daily life.

Because of its unique properties, vanadium dioxide has become an ideal choice for replacing silicon materials in a new generation of low-power electronic devices. Swiss researchers recently demonstrated the use of vanadium dioxide in aerospace communication systems to achieve programmable radio frequency electronic functions, highlighting the application potential of this oxide.

characteristic
Vanadium dioxide has phase change characteristics, and its form can be converted between insulators and metals. It behaves as an insulator at room temperature, and behaves as a metal conductor above 68 degrees Celsius. This is because its atomic structure can transform from a room temperature crystal structure to a metal structure when the temperature is higher than 68 degrees Celsius, and the transformation takes less than 1 nanosecond, which is an advantage for electronic applications. Related research has led many people to believe that vanadium dioxide may become a revolutionary material for the electronics industry in the future.

However, it is not easy to release the full potential of vanadium dioxide, because for modern electronic devices, many circuits must be guaranteed to operate perfectly at 100 degrees Celsius, and the conversion temperature of 68 degrees Celsius is too low. In addition, vanadium dioxide is also very sensitive to other factors, such as electrification or terahertz radiation pulses may cause its phase change.

Researchers at the Swiss Federal Institute of Technology in Lausanne previously increased the phase transition temperature of vanadium dioxide to more than 100 degrees Celsius by adding germanium, a rare metal material, to the vanadium dioxide film. In the latest research, they have made another breakthrough in radio frequency applications, using vanadium dioxide and phase change switching technology to create an ultra-compact, adjustable frequency filter for the first time. This new type of filter is particularly suitable for the frequency range used by space communication systems. Related papers have been published in IEEE Access, an open source journal of the American Society of Electrical and Electronics Engineers.

application
Over the years, researchers have studied the phase change behavior of VO2 under various external stimulus conditions and related device applications. The specific phase change excitation sources include heat, light, electricity, electrochemistry, magnetism, stress, etc., under different stimulus conditions. The VO2 phase transition process and application are quite different. Starting from the VO2 phase transition and the unique physical and chemical properties caused by the phase transition, the VO2 phase transition mechanism under different stimuli such as heat, light, electricity, electrochemistry, stress and magnetic field, and the response and application of VO2 devices under the corresponding stimuli are summarized in turn.

Among them, the thermally induced VO2 phase change still dominates, and the application range includes smart energy-saving windows, target camouflage, thermal rectification, radio frequency switches, resonators, drivers, temperature-sensitive devices and field emission devices; the light-induced VO2 phase change is fast and convenient, It is conducive to the study of phase change dynamics. Related device applications include optical storage, all-optical switches, photodetectors, phototransistors, etc.; electric field-induced VO2 phase change devices have simple structure and broad application prospects, and can be used as electrical switches and field effect transistors. , Electronic oscillators, memristors, radio frequency switches, electro-optic modulators, etc.; VO2 phase change caused by ion doping and electrostatic effects under electrochemical conditions can be used for ionic liquid field effect tubes and electrochromic devices; stress will change In the VO2 lattice constant, it changes its electronic structure to cause a phase change, and can be used as a flexible stress sensor; VO2 also has a sudden change in the magnetic susceptibility during the phase change, making it potential in the field of magnetic refrigeration and spintronic devices. the value of.
SAT NANO can supply the VO2 nanopowder 100-200nm, if you have any enquiry, please feel free to contact us at admin@satnano.com

Leave a message Please click here for inquiry
Provide the right solution according to your needs,offer efficient service,leave a message for the product information and requirements you need,customize now!