Journal ArticleDOI
Thermochromic VO2 Thin Film Prepared by Post Annealing Treatment of V2O5 Thin Film
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TLDR
In this paper, a simple method was proposed to prepare VO2 thin films from easily gained V2O5 thin films using sol-gel method on fused-quartz substrates.Abstract:
Thermochromic vanadium dioxide (VO2) exhibits a semi-conducting to metallic phase transition at about 68°C, involving strong variations in electrical and optical properties A simple method was proposed to prepare VO2 thin films from easily gained V2O5 thin films The detailed thermodynamic calculation was done and the results show that V2O5 will decompose to VO2 when the post annealing temperature reaches 550°C at the atmospheric pressure of less than 006Pa The initial V2O5 films were prepared by sol-gel method on fused-quartz substrates Different post annealing conditions were studied The derived VO2 thin film samples were characterized using X-ray diffraction and X-ray photoelectron spectroscopy The electrical resistance and infrared emissivity of VO2 thin films under different temperatures were measured The results show that the VO2 thin film derived from the V2O5 thin film annealed at 550°C for 10 hours is pure dioxide of vanadium without other valences It was observed that the resistance of VO2 thin film with thickness about 600nm can change by 4 orders of magnitude and the 75-14μm emissivity can change by 06 during the phase transitionread more
Citations
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Journal ArticleDOI
Electrical Switching in Semiconductor-Metal Self-Assembled VO2 Disordered Metamaterial Coatings.
TL;DR: It is shown that the VO2 disordered self-assembly of M and R phases is highly stable and can be thermally triggered with high precision using short heating or cooling pulses with adjusted strengths, which enables an accurate and tunable thermal control of the electrical switching.
Journal ArticleDOI
Visible Thermochromism in Vanadium Pentoxide Coatings.
TL;DR: Temperature-dependent UV-vis spectroscopy and X-ray diffraction allow the correlation between the reversible continuous red shift of the absorption and the anisotropic thermal expansion along the (001) direction, that is, perpendicular to the sheets constituting the layered structure to be observed.
Journal ArticleDOI
Study of the structural, thermal, optical, electrical and nanomechanical properties of sputtered vanadium oxide smart thin films
Deeksha Porwal,Deeksha Porwal,A. Carmel Mary Esther,A. Carmel Mary Esther,I. Neelakanta Reddy,N. Sridhara,Nagendra P. Yadav,Dinesh Rangappa,Parthasarathi Bera,Chinnasamy Anandan,Anand Kumar Sharma,Arjun Dey +11 more
TL;DR: In this article, the phase transitions of the vanadium oxide films were investigated by the differential scanning calorimetric technique and the sheet resistance of the deposited films was measured by a two-probe method and the data were in the range of 106 to 105 Ω per square.
Journal ArticleDOI
Preparation, infrared emissivity and thermochromic properties of Co doped ZnO by solid state reaction
TL;DR: In this paper, green Zn 1-x Co x O nanopowders were synthesized via solid-state reaction at different calcination temperatures, and the effects of sinterring temperature on structure, morphologies, color and infrared emissivity was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), XPS, UV-visible absorption spectra (UV-visible spectra), Raman and IR-2 dual-band IR emissometer, respectively.
Journal ArticleDOI
Characteristics of Vanadium Oxide Thin Films Prepared by Metal?Organic Decomposition for Bolometer Detectors
TL;DR: In this article, high-axis-oriented V2O5 thin films with an abrupt transition were fabricated by metal-organic decomposition (MOD) on SiO2/Si substrates.
References
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Journal ArticleDOI
Oxides Which Show a Metal-to-Insulator Transition at the Neel Temperature
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Effect of Mo-W Co-doping on semiconductor-metal phase transition temperature of vanadium dioxide film
TL;DR: In this paper, the effect of molybdenum and tungsten co-doping on semiconductor-metal transition of vanadium dioxide films is investigated, and it is compared with single moly bdenum doped and undoped films.
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High quality vanadium dioxide films prepared by an inorganic sol-gel method
TL;DR: In this paper, an inorganic sol-gel method was developed to produce vanadium dioxide (VO{sub 2}) thin films which exhibit an apparently reversible electrical resistance switching at about 60 C.
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Role of surface defects and microstructure in infrared optical properties of thermochromic VO2 materials
TL;DR: In this article, the authors used aluminum samples as standards to correlate reflectivity responses with porosity and surface defects, and showed that the main parameters conditioning the optical contrast should be surface defects and porosity, not the preferred crystal orientations.