Tungsten-doped vanadium oxides prepared by direct liquid injection MOCVD

Dimitra Vernardou; Martyn E. Pemble; David W. Sheel

doi:10.1002/cvde.200606527

Tungsten-doped vanadium oxides prepared by direct liquid injection MOCVD

Dimitra Vernardou
, Martyn E. Pemble
, David W. Sheel

University College Cork

Research output: Contribution to journal › Article › peer-review

Abstract

This paper examines the effect of doping on vanadium(IV) oxide (VÛ2 (M)) coatings on glass, using atmospheric-pressure, direct liquid injection metal-organic (DLI-MO)CVD, which potentially may find application as part of smart glazing units. It is found that tungsten-doped VO₂ (M) deposited on commercial SiO₂-precoated glass using a 0.1 M solution of vanadyl(IV) acetylacetonate (VO(acac)₂) and tungsten (VI) ethoxide (W(OC₂H₅)₅) in methanol shows a reduction in thermochromic transition temperature (T_c) from 60 °C in VO ₂ (M) to 35°C in V_0.98W_0.98W _0.02O₂. This finding is discussed in terms of various atomic percentages of tungsten and oxygen flow rates. The crystallinity, composition, morphology, optical properties, uniformity, and oxidation phase of the films are evaluated by X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), scanning electron microscopy (SEM), IR reflectance- transmittance, and Raman spectroscopy, respectively. The relationship between dopant concentration and T_c in the most applicable range for solar window coatings is refined by formation of a single-phase film and precise determination of these parameters.

Original language	English
Pages (from-to)	158-162
Number of pages	5
Journal	Chemical Vapor Deposition
Volume	13
Issue number	4
DOIs	https://doi.org/10.1002/cvde.200606527
Publication status	Published - Apr 2007

Keywords

Atmospheric-pressure direct liquid injection MOCVD
Thermochromic properties
Tungsten(VI) ethoxide
Vanadyl(IV) acetyl acetonate

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10.1002/cvde.200606527

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title = "Tungsten-doped vanadium oxides prepared by direct liquid injection MOCVD",

abstract = "This paper examines the effect of doping on vanadium(IV) oxide (V{\^U}2 (M)) coatings on glass, using atmospheric-pressure, direct liquid injection metal-organic (DLI-MO)CVD, which potentially may find application as part of smart glazing units. It is found that tungsten-doped VO2 (M) deposited on commercial SiO2-precoated glass using a 0.1 M solution of vanadyl(IV) acetylacetonate (VO(acac)2) and tungsten (VI) ethoxide (W(OC2H5)5) in methanol shows a reduction in thermochromic transition temperature (Tc) from 60 °C in VO 2 (M) to 35°C in V0.98W0.98W 0.02O2. This finding is discussed in terms of various atomic percentages of tungsten and oxygen flow rates. The crystallinity, composition, morphology, optical properties, uniformity, and oxidation phase of the films are evaluated by X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), scanning electron microscopy (SEM), IR reflectance- transmittance, and Raman spectroscopy, respectively. The relationship between dopant concentration and Tc in the most applicable range for solar window coatings is refined by formation of a single-phase film and precise determination of these parameters.",

keywords = "Atmospheric-pressure direct liquid injection MOCVD, Thermochromic properties, Tungsten(VI) ethoxide, Vanadyl(IV) acetyl acetonate",

author = "Dimitra Vernardou and Pemble, \{Martyn E.\} and Sheel, \{David W.\}",

year = "2007",

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doi = "10.1002/cvde.200606527",

language = "English",

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T1 - Tungsten-doped vanadium oxides prepared by direct liquid injection MOCVD

AU - Vernardou, Dimitra

AU - Pemble, Martyn E.

AU - Sheel, David W.

PY - 2007/4

Y1 - 2007/4

N2 - This paper examines the effect of doping on vanadium(IV) oxide (VÛ2 (M)) coatings on glass, using atmospheric-pressure, direct liquid injection metal-organic (DLI-MO)CVD, which potentially may find application as part of smart glazing units. It is found that tungsten-doped VO2 (M) deposited on commercial SiO2-precoated glass using a 0.1 M solution of vanadyl(IV) acetylacetonate (VO(acac)2) and tungsten (VI) ethoxide (W(OC2H5)5) in methanol shows a reduction in thermochromic transition temperature (Tc) from 60 °C in VO 2 (M) to 35°C in V0.98W0.98W 0.02O2. This finding is discussed in terms of various atomic percentages of tungsten and oxygen flow rates. The crystallinity, composition, morphology, optical properties, uniformity, and oxidation phase of the films are evaluated by X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), scanning electron microscopy (SEM), IR reflectance- transmittance, and Raman spectroscopy, respectively. The relationship between dopant concentration and Tc in the most applicable range for solar window coatings is refined by formation of a single-phase film and precise determination of these parameters.

AB - This paper examines the effect of doping on vanadium(IV) oxide (VÛ2 (M)) coatings on glass, using atmospheric-pressure, direct liquid injection metal-organic (DLI-MO)CVD, which potentially may find application as part of smart glazing units. It is found that tungsten-doped VO2 (M) deposited on commercial SiO2-precoated glass using a 0.1 M solution of vanadyl(IV) acetylacetonate (VO(acac)2) and tungsten (VI) ethoxide (W(OC2H5)5) in methanol shows a reduction in thermochromic transition temperature (Tc) from 60 °C in VO 2 (M) to 35°C in V0.98W0.98W 0.02O2. This finding is discussed in terms of various atomic percentages of tungsten and oxygen flow rates. The crystallinity, composition, morphology, optical properties, uniformity, and oxidation phase of the films are evaluated by X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), scanning electron microscopy (SEM), IR reflectance- transmittance, and Raman spectroscopy, respectively. The relationship between dopant concentration and Tc in the most applicable range for solar window coatings is refined by formation of a single-phase film and precise determination of these parameters.

KW - Atmospheric-pressure direct liquid injection MOCVD

KW - Thermochromic properties

KW - Tungsten(VI) ethoxide

KW - Vanadyl(IV) acetyl acetonate

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DO - 10.1002/cvde.200606527

M3 - Article

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SN - 0948-1907

VL - 13

SP - 158

EP - 162

JO - Chemical Vapor Deposition

JF - Chemical Vapor Deposition

IS - 4

ER -

Tungsten-doped vanadium oxides prepared by direct liquid injection MOCVD

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Keywords

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