| 초록 |
Vanadium dioxide (VO2) nanostructures have been widely investigated regarding their intrinsic metal-insulator transition (MIT) to apply non-volatile memories, Mott transistors, strain sensors, and thermal actuators. Also, VO2 nanostructures can be used in smart windows, because of their MITs occurring at 68℃ near room temperature (RT) and their infrared transmittance depending on Metal and insulator phase retaining visible transmittance. In particular, VO2 nanoparticles are more suitable for smart windows than other VO2 nanostructures due to a narrowed hysteresis width, high transmittances in visible range and the large difference of IR transmittance. Here, we selectively synthesized the nanoparticles with circular (or hexagonal) and rectangular shapes by sol-gel process and controlled the size of nanoparticles by changing the annealing condition and the number of spin-coating. Using in-situ heating stage transmission electron microscopy, we observed the MIT of the VO2 nanoparticles, and found that the transition was progressed while approaching to the MIT. These results are expected to provide a new aspect of the distinguished MIT of VO2 nanoparticle. |
