Abstract
Vanadium dioxide (VO2) is a typical metal-insulator transition (MIT) material, which changes from room-temperature monoclinic insulating phase to high-temperature rutile metallic phase. The phase transition of VO2 is accompanied by sudden changes in conductance and optical transmittance. Due to the excellent phase transition characteristics of VO2, it has been widely studied in the applications of electric and optical devices, smart windows, sensors, actuators, etc. In this review, we provide a summary about several phases of VO2 and their corresponding structural features, the typical fabrication methods of VO2 nanostructures (e.g., thin film and low-dimensional structures (LDSs)) and the properties and related applications of VO2. In addition, the challenges and opportunities for VO2 in future studies and applications are also discussed.
Highlights
Applications and Perspectives.A phase transition is a sudden change of one phase to another under an external stimuli, e.g., a thermal field, strain energy, surface energy, an external force, a magnetic field, etc., accompanied by the significant change in physical properties
The rapid development in VO2 preparation and performance modulation technologies has greatly promoted the application of VO2 in many aspects; e.g., VO2 can be used as a channel layer of field-effect transistor (FET) due to its electric-fieldadjustable Metal–insulator transition (MIT) behavior
Compared with the hydrothermal method, the VO2 NWs synthesized by chemical vapor deposition (CVD) usually have a larger length-to-diameter ratio
Summary
Applications and Perspectives.A phase transition is a sudden change of one phase to another under an external stimuli, e.g., a thermal field, strain energy, surface energy, an external force, a magnetic field, etc., accompanied by the significant change in physical properties. Among inorganic materials with MIT, vanadium dioxide (VO2 ) is widely focused on because of the near-room-temperature phase transition temperature (Tc ≈ 340 K) and the reversible, huge changes in conductance and transmittance during MIT [1,2]. The strongly correlated electron effect introduced by the special d electron orbit structure of VO2 leads to abundant interesting physical and chemical properties. Based on these excellent performances, VO2 can be widely used in many fields and has been becoming one of the hottest metal oxide materials in recent years [3,4,5,6,7,8,9]. The distinctive hysteresis loop during the MIT process under an electric filed or temperature change leads to applications in memory devices; the great difference of transmittance between the insulating and metallic phases makes it a candidate material for smart windows; the strain and gas-environment-dependent MIT behavior holds promise for developing novel strain and gas sensors, etc., [6,10,11,12,13]
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