Mechanism of the gasochromic coloration of porous WO3 films

Georg, Andreas; Graf, Wolfgang; Neumann, Ronny; Wittwer, V.

doi:10.1016/s0167-2738(99)00273-8

Cited by 168 publications

(90 citation statements)

References 11 publications

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“…Gasochromic windows have been introduced based on the chromic properties of WO 3 (Schweiger et al 1998;Georg et al 1998Georg et al , 2000aGeorg et al , 2000bGeorg et al , 2001aGeorg et al , 2001bGeorg et al , 2002Georg et al , 2008Opara-Krašovec et al 2000, 2002Wittwer et al 2001Wittwer et al , 2004Yaacob et al 2009) and palladium doped WO 3 (Zayat et al 1998, 2002 as stated previously in Ch.3.1. Due to its high redox potential, it is possible to colour WO 3 with hydrogen gas H 2 which is not possible for most other electrochromic materials.…”

Section: Wo3-based Gasochromic Windowsmentioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,140

591

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A survey on prototype and currently commercial dynamic tintable smart windows has been carried out. The technologies of electrochromic, gasochromic, liquid crystal and electrophoretic or suspended-particle devices were examined and compared for dynamic daylight and solar energy control in buildings. Presently, state-of-the art commercial electrochromic windows seem most promising to reduce cooling loads, heating loads and lighting energy in buildings, where they have been found most reliable and able to modulate the transmittance up to 68 percent of the total solar spectrum. Their efficiency has already been proven in hot Californian climates, but more research is necessary to validate the products for colder climates, and to improve furthermore the commercial products in order to control the indoor climate in a more energy efficient way by reducing both heating and cooling loads.

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Section: Wo3-based Gasochromic Windowsmentioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,140

591

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“…This will lead to heating of the structure, which can be detected by simple temperature measurements. An example could be a hydrogen sensor, where the gasochromic coloration of WO 3 in the presence of hydrogen gas (H 2 ) [15] can be used.…”

Section: Numerical Examples For Periodic Gratingsmentioning

confidence: 99%

Ultrasensitive Switching Between Resonant Reflection and Absorption in Periodic Gratings

Komarevskiy¹,

Shklover²,

Braginsky³

et al. 2013

PIER

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Abstract-Guided-Mode Resonance (GMR) effects in transparent periodic gratings possess a number of remarkable phenomena. GMRs exhibit strong features in the optical spectrum, i.e., dips, peaks, cusps, and may attain extremely high Q-factors. In some cases, resonant reflection with the efficiency equal to unity can be observed. We demonstrate that the introduction of small losses in the structure can drastically modify its optical response by causing strong absorption resonances. Unity reflection in loss-free structures can be almost completely converted into unity absorption peaks as soon as very small losses are introduced. Even thin absorbing films in the structure (or in its vicinity) can lead to such strong resonant absorption effects. The resonances may exhibit a negligible spectral shift, but a significant variation in the magnitude when losses are slightly altered, which is highly attractive for sensor and switch applications. Absorption peaks experience a resonant behavior with respect to both frequency and material losses. We show that the width of the absorption peaks decreases and approaches the width of the reflection peaks, as losses decrease. Thus, high-Q resonances can be observed. The absorption resonances also possess strong angular dependence; they may split and significantly increase in magnitude for a slightly inclined incidence. We elucidate the resonant reflection/absorption effects theoretically and provide numerical examples.

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“…WO3 thin films belong to transparent wide band gap semiconductor group that in contact with a thin (few nanometers) Pt or Pd surface layer, their optical absorption transforms from the transparent to a dark blue state whenever are illuminated with hydrogen [1][2][3]. This optical switching is directly related to the double insertion/extraction of H+ ions and electrons according to the following reaction [4]:…”

Section: Introductionmentioning

confidence: 99%

Oxyhydrogen and Hydrogen Detection by Gasochromic Coloration of Highly Porous Tungsten Oxide with Fractal-Like Pd Nanoparticles

Ranjbar

Sberveglieri

2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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WO3 thin films were deposited by pulsed laser deposition (PLD) on glass substrates at 100 mTorr oxygen pressure. Monodispersed palladium nanoparticles (50 nm) were synthesized by hydrogen reduction of PdCl2 drop-casted on the surface of the films. For oxyhydrogen detection, first a saturated coloration by 10%H2/Ar was prepared. Then different oxygen flow with certain O2:H2 ratios were exposed to the colored samples. Depending on this ratio, the optical density of samples was observed to drop into certain new values until vanishes for a ratio about 20. A desirable fast coloration with linear dependency on hydrogen concentration was also observed.

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Mechanism of the gasochromic coloration of porous WO3 films

Cited by 168 publications

References 11 publications

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Ultrasensitive Switching Between Resonant Reflection and Absorption in Periodic Gratings

Oxyhydrogen and Hydrogen Detection by Gasochromic Coloration of Highly Porous Tungsten Oxide with Fractal-Like Pd Nanoparticles

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