Novel electrochromic devices based on complementary nanocrystalline TiO2 and WO3 thin films

Bonhôte, Pierre; Gogniat, Eric; Grätzel, Michaël; Ashrit, P. V.

doi:10.1016/s0040-6090(99)00229-1

Cited by 91 publications

(59 citation statements)

References 27 publications

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“…The advantage of the utilization of mesoporous films is that an amount of molecular modifier that will give a perceptible color change in a working device can be adsorbed, i.e., a 100 to 1000 fold amplification of the light absorbance efficiency is observed. [14] In the case where modification is carried out on a flat surface, no perceptible color change would be appreciated. In reflective display devices incorporating these electrochromic elements, contrast ratios at the photonic wavelength have exceeded 20:1.…”

Section: Description Of Nanochromics Technologymentioning

confidence: 99%

Nanomaterials-Based Electrochromics for Paper-Quality Displays

Bach¹,

Corr²,

Lupo³

et al. 2002

Adv. Mater.

242

141

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Section: Description Of Nanochromics Technologymentioning

confidence: 99%

Nanomaterials-Based Electrochromics for Paper-Quality Displays

Bach¹,

Corr²,

Lupo³

et al. 2002

Adv. Mater.

242

141

View full text Add to dashboard Cite

“…There is still controversy as the precise nature of these materials and their formation with their properties being dependent on the synthetic route used [1,[3][4][5][6][7][8][9][10][11] While these materials hold promise in the areas of photovoltaics and nanoelectronics [12,13], a few reports have recently appeared where they have been exploited as catalyst supports [1,3,14].…”

Section: Introductionmentioning

confidence: 99%

Potassium Titanate: An Alternative Support for Gold Catalyzed Carbon Monoxide Oxidation?

et al. 2008

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It has been found that gold supported on potassium titanate, KTiO 2 (OH) can, under some circumstances, exhibit a superior performance for the oxidation of carbon monoxide, relative to that obtained with titania as a support. It appears that the dispersions of gold on the two types of support are sufficiently similar that other factors are responsible for the improved activity noted. It may be that the higher basic character and/or detailed structural features of the titanate surface plays a role.

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“…Hence, an electrochromic WO 3 layer can be combined with a photoactive dye sensitized TiO 2 layer and a photochromic device can be constructed [22][23][24]. An enhanced or better photochromic performance can be obtained if WO 3 -TiO 2 composite layers have: (1) A nanocrystalline feature, as nanocrystalline anatase titania, owing to its enhanced generation of charge carriers facilitates the capture of photoelectrons from the excited dye molecule, and nanocrystalline WO 3 , which provides high surface area for ion intercalation/ deintercalation; and (2) a mesoporous structure that can provide a large surface area for redox reactions and facilitate ion and electron transport.…”

Section: Introductionmentioning

confidence: 99%

Erratum to: Sol–gel synthesis of mesoporous WO3–TiO2 composite thin films for photochromic devices

Djaoued

Balaji

Beaudoin

2013

J Sol-Gel Sci Technol

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Mesoporous WO 3 -TiO 2 composite films were prepared by a sol gel based two stage dip coating method and subsequent annealing at 450, 500 and 600°C. An organically modified silicate based templating strategy was adopted in order to obtain a mesoporous structure. The composite films were prepared on ITO coated glass substrates. The porosity, morphology, and microstructures of the resultant products were characterized by scanning electron microscopy, N 2 adsorption-desorption measurements, l-Raman spectroscopy and X-ray diffraction. Calcination of the films at 450, and 500°C resulted in mixed hexagonal (h) plus monoclinic phases, and pure monoclinic (m) phase of WO 3 , respectively. The degree of crystallization of TiO 2 present in these composite films was not evident. The composite films annealed at 600°C, however, consist of orthorhombic (o) WO 3 and anatase TiO 2 . It was found that the o-WO 3 phase was stabilized by nanocrystalline anatase TiO 2 . The thus obtained mesoporous WO 3 -TiO 2 composite films were dye sensitized and applied for the construction of photochromic devices. The device constructed using dye sensitized WO 3 -TiO 2 composite layer heat treated at 600°C showed an optical modulation of 51 % in the NIR region, whereas the devices based on the composite layers heat treated at 450, and 500°C showed only a moderate optical modulation of 24.9, and 38 %, respectively. This remarkable difference in the transmittance response is attributed to nanocrystalline anatase TiO 2 embedded in the orthorhombic WO 3 matrix of the WO 3 -TiO 2 composite layer annealed at 600°C.

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Novel electrochromic devices based on complementary nanocrystalline TiO2 and WO3 thin films

Cited by 91 publications

References 27 publications

Nanomaterials-Based Electrochromics for Paper-Quality Displays

Nanomaterials-Based Electrochromics for Paper-Quality Displays

Potassium Titanate: An Alternative Support for Gold Catalyzed Carbon Monoxide Oxidation?

Erratum to: Sol–gel synthesis of mesoporous WO3–TiO2 composite thin films for photochromic devices

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