Transparent conductors as solar energy materials: A panoramic review

Composite Titanium Dioxide Nanomaterials

Nanoceramic VO2 thermochromic smart glass: A review on progress in solution processing

Thin films of tungsten-doped vanadium(IV) oxide were prepared on glass substrates from the atmospheric pressure chemical vapor deposition of vanadium(IV) chloride, tungsten(VI) ethoxide, and water at 500−600 °C. The films were characterized by Raman microscopy, glancing angle X-ray diffraction (GAXRD), X-ray photoelectron spectroscopy (XPS), Rutherford backscattering (RBS), scanning electron microscopy (SEM), and vis/IR reflectance−transmittance. The films showed a reduction in thermochromic transition temperatures from 68 °C in VO2 to 42 °C in V0.99W0.01O2approaching that required for commercial use as an intelligent window coating.

Intelligent window coatings: Atmospheric pressure chemical vapor deposition of tungsten-doped vanadium dioxide

Thin-film materials with 'smart' properties that react to temperature variations, electric or magnetic fields, and/or pressure variations have recently attracted a great deal of attention. Vanadium dioxide (VO2) belongs to this family of 'smart materials' because it exhibits a semiconductor-to-metal first-order phase transition near 340 K, accompanied by an abrupt change in its resistivity and near-infrared transmission. It is also of great interest in condensed-matter physics because it is a classic strongly correlated electron system. In order to integrate vanadium dioxide into microelectronic circuits, thin-film growth of VO2 has been studied extensively, and studies of VO2 nanoparticles have shown that the phase transition is size-dependent. This paper presents a broad overview of the growth techniques that have been used to produce thin films and nanoparticles of VO2, including chemical vapor deposition, sol–gel synthesis, sputter deposition and pulsed laser deposition. Representative deposition techniques are described, and typical thin-film characteristics are presented, with an emphasis on recent results obtained using pulsed laser deposition. The opportunities for growing epitaxial films of VO2, and for doping VO2 films to alter their transition temperature and switching characteristics, are also discussed.

https://iopscience.iop.org/article/10.1088/0953-8984/20/26/264016/pdf

Synthesis of vanadium dioxide thin films and nanoparticles

Thin films of the vanadium oxides, V2O5, VO2, VOx
(x
= 2.00–2.50) and V6O13 were prepared on glass substrates by atmospheric pressure chemical vapour deposition (APCVD) of vanadium tetrachloride and water at 400–550 °C. The specific phase deposited was found to be dependent on the substrate temperature and the reagent concentrations. The films were characterised by Raman microscopy, X-ray diffraction (XRD), Rutherford backscattering (RBS), scanning electron microscopy (SEM), energy dispersive analysis by X-rays (EDX), reflectance/transmittance and UV absorption spectroscopy. The VO2 films show by Raman microscopy and reflectance/transmittance spectroscopy, reversible switching behaviour at 68 °C associated with a phase change from monoclinic (MoO2 structure) to tetragonal (TiO2, rutile structure).

Intelligent window coatings: atmospheric pressure chemical vapour deposition of vanadium oxides

Smart multifunctional V2O5 is an appealing oxide for energy–saving and energy–storage applications. This review article comprehensively analyzes the most recent advances and applications. The unique electronic structure of V2O5 with...

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Dimitra Vernadou

Papers

Intelligent window coatings: atmospheric pressure chemical vapour deposition of vanadium oxides

Recent Advances in Vanadium Pentoxide (V2O5) Towards Related–Applications on Chromogenic and Beyond: Fundamentals, Progress, and Perspectives