Aerosol assisted chemical vapour deposition of tungsten oxide films from polyoxotungstate precursors: active photocatalysts

Cross, Warren B.; Parkin, Ivan P.

doi:10.1039/b303800a

Cited by 56 publications

(43 citation statements)

References 13 publications

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“…An advantage of AACVD is that the precursor does not need to be volatile (as in APCVD) but just soluble in the solvent; this allows the use of more unconventional precursors not usable with APCVD [65,66]. The solvent used, however, must have the right physical and chemical properties to form an aerosol [67].…”

Section: Comparison Of Apcvd Reactionsmentioning

confidence: 99%

Thermochromic Coatings for Intelligent Architectural Glazing

Parkin

Binions

Piccirillo

et al. 2008

JNanoR

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Abstract. Thermochromic glazing is a type of intelligent glazing; one where the properties of the glazing change according to some external stimulus. More particularly a thermochromic window is a device that changes its transmission and reflectance properties at a critical temperature (T c ). At this specific temperature the material undergoes a semi-conductor to metal transition. At temperatures lower than T c the window lets all of the solar energy that hits it through. At temperatures above T c the window reflects the infra-red portion of solar energy. In such a way thermochromic windows may help reduce air conditioning and heating costs leading to more energy efficient buildings. This review details the nature of the semi-conductor to metal transition and indicates how substitutional doping within a crystal lattice can be used to manipulate and fine tune the critical temperature. Also detailed is the underlying science and methodologies so far employed in the production of thermochromic thin films.

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Section: Comparison Of Apcvd Reactionsmentioning

confidence: 99%

Thermochromic Coatings for Intelligent Architectural Glazing

Parkin

Binions

Piccirillo

et al. 2008

JNanoR

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“…1 Introduction Tungsten oxides have attracted extensive interest due to their multi-functional properties in electrochromic [1,2], catalytic [3], photocatalytic [4], gassensing [5,6], water splitting [7] and photovoltaic [8] applications. Tungsten oxide thin films with various morphologies, including three dimensional (3D) ball-like, 2D planar and 1D nanorod (NR) structures have shown different electrochromic photochemical, optical, photocatlysis and gas sensing properties [9][10][11].…”

mentioning

confidence: 99%

Growth mechanism of planar or nanorod structured tungsten oxide thin films deposited via aerosol assisted chemical vapour deposition (AACVD)

Ling

Blackman

2015

Phys. Status Solidi C

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Aerosol assisted chemical vapour deposition (AACVD)is used to deposit tungsten oxide thin films from tungsten hexacarbonyl (W(CO) 6 ) at 339 to 358 °C on quartz substrate. The morphologies of as-deposited thin films, which are comprised of two phases (W 25 O 73 and W 17 O 47 ), vary from planar to nanorod (NR) structures as the distance from the inlet towards the outlet of the reactor is traveresed. This is related to variation of the actual temperature on the substrate surface (∆ = 19 ℃), which results in a change in growth mode due to competition between growth rate (perpendicular to substrate) and nucleation rate (parallel to substrate). When the ratio of perpendicular growth rate to growth rate contributed by nucleation is higher than 7.1, the as-deposited tungsten oxide thin film forms as NR.SEM images showing variation in morphology of WO x thin filmsshowing structures that vary from planar to NRs as a function of distance from the reactor inlet ( 5, 15, 25, 35, 45 mm) and the corresponding substrate surface temperature.

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“…Micro-Raman spectrum of WOx films deposited onto CP shown in Figure 1C, is the typical signal of amorphous tungsten oxide 30 and is similar to those of WOx deposited by PLD at 0.6 Pa of oxygen pressure using sintered WO 3 as the ablated target, 31 or to WOx deposited using W target in an oxidizing atmosphere (at 10 Pa of dry air). 32 The spectrum shows three broad features in the 100-300 cm 33,34 The Raman bands at 275 cm -1 and 430-440 cm -1 correspond to the deformation vibrations of (O-W-O) bonds and the band at 800 cm -1 corresponds to the stretching vibrations of W-O bonds. 35,36 It should be noted that XRD (not shown) did not show any peak related to metallic W.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Tungsten oxide-Au nanosized film composites for glucose oxidation and sensing in neutral medium

Gougis

Mohamedi

2015

IJN

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In this work, we report for the first time the use of tungsten oxide (WOx) as catalyst support for Au toward the direct electrooxidation of glucose. The nanostructured WOx/Au electrodes were synthesized by means of laser-ablation technique. Both micro-Raman spectroscopy and transmission electron microscopy showed that the produced WOx thin film is amorphous and made of ultrafine particles of subnanometer size. X-ray diffraction and X-ray photoelectron spectroscopy revealed that only metallic Au was present at the surface of the WOx/Au composite, suggesting that the WOx support did not alter the electronic structure of Au. The direct electrocatalytic oxidation of glucose in neutral medium such as phosphate buffered saline (pH 7.2) solution has been investigated with cyclic voltammetry, chronoamperometry, and square-wave voltammetry. Sensitivity as high as 65.7 μA cm −2 mM −1 up to 10 mM of glucose and a low detection limit of 10 μM were obtained with square-wave voltammetry. This interesting analytical performance makes the laser-fabricated WOx/Au electrode potentially promising for implantable glucose fuel cells and biomedical analysis as the evaluation of glucose concentration in biological fluids. Finally, owing to its unique capabilities proven in this work, it is anticipated that the laser-ablation technique will develop as a fabrication tool for chip miniature-sized sensors in the near future.

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Aerosol assisted chemical vapour deposition of tungsten oxide films from polyoxotungstate precursors: active photocatalysts

Cited by 56 publications

References 13 publications

Thermochromic Coatings for Intelligent Architectural Glazing

Thermochromic Coatings for Intelligent Architectural Glazing

Growth mechanism of planar or nanorod structured tungsten oxide thin films deposited via aerosol assisted chemical vapour deposition (AACVD)

Tungsten oxide-Au nanosized film composites for glucose oxidation and sensing in neutral medium

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Aerosol assisted chemical vapour deposition of tungsten oxide films from polyoxotungstate precursors: active photocatalysts

Cited by 56 publications

References 13 publications

Thermochromic Coatings for Intelligent Architectural Glazing

Thermochromic Coatings for Intelligent Architectural Glazing

Growth mechanism of planar or nanorod structured tungsten oxide thin films deposited via aerosol assisted chemical vapour deposition (AACVD)

Tungsten oxide-Au nanosized film composites for&nbsp;glucose oxidation and sensing in neutral medium

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Tungsten oxide-Au nanosized film composites for glucose oxidation and sensing in neutral medium