Fabrication and visible-light photochromism of novel hybrid inorganic–organic film based on polyoxometalates and ethyl cellulose

Jing, Xiaofei; Zou, Donglei; Meng, Qingling; Zhang, Wei; Zhang, Fengjun; Feng, Wei; Han, Xiangkui

doi:10.1016/j.inoche.2014.05.030

Cited by 28 publications

(23 citation statements)

References 29 publications

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“…The main mechanism for the reduction of W +6 to W +5 is the electron transfer from an organic stabilizer or a ligand to tungsten ion [19]. The reduction of W +6 in the course of the photochromic response is supposed to be mainly due to the transfer of an electron from an organic stabilizer [20]. The photoexcitation of WO 3 leads to the transfer of electron density from the oxygen atom to the tungsten atom.…”

Section: Introductionmentioning

confidence: 99%

Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO3 Nanoparticles

et al. 2019

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Tungsten oxide-based bulk and nanocrystalline materials are widely used as photocatalytic and photo- and electrochromic materials, as well as materials for biomedical applications. In our work, we focused our attention on the effect of sodium cations on the structure and photochromic properties of the WO3@PVP aqueous sols. To establish the effect, the sols were synthesized by either simple pH adjusting of sodium or ammonium tungstates’ solutions, or using an ion exchange technique to remove the cations from the materials to the greatest possible extent. We showed that the presence of sodium cations in WO3@PVP favors the formation of reduced tungsten species (W+5) upon UV irradiation of the materials, strongly affecting their photochromic and photocatalytic properties. The pronounced photoreductive properties of WO3@PVP sols in photocatalytic reactions were demonstrated. Due to photoreductive properties, photochromic sols of tungsten oxide can act as effective photoprotectors in photooxidation processes. We believe that our work provides a considerable contribution to the elucidation of photochromic and redox phenomena in WO3-based materials.

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Section: Introductionmentioning

confidence: 99%

Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO3 Nanoparticles

et al. 2019

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“…Above band gap (3.6 eV) radiation incident on the sample instigates an oxygen‐to‐metal ligand‐to‐metal charge transfer (O → M LMCT), reducing W 6+ to W 5+ which results in the formation of a visible light‐absorbing charge transfer complex (Figure S1). It is therefore likely that soft X‐ray irradiation (1.486 keV) will induce similar reduction of metallic cations.…”

Section: Resultsmentioning

confidence: 99%

“…For example, the measurement of the M n + /M ( n ‐1)+ ratio (where M = W, Mo, or V) post UV photoreduction in group V and VI metal oxide‐based photochromic and photocatalytic materials provides a means to determine the extent of the reaction. Unfortunately, XPS‐derived determination of this ratio may return inaccurate results, because of additional photoreduction by the X‐rays . To our knowledge, no quantitative investigation has been reported examining these processes in group V and VI transition‐metal‐oxide inorganic‐organic hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

X‐ray‐induced reduction of a surfactant/polyoxotungstate hybrid compound

Colusso

McDonagh

Cortie

2018

Surface & Interface Analysis

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We investigate the spontaneous reduction of a photochromic surfactant/ polyoxotungstate hybrid during repeated X-ray photoelectron spectroscopy (XPS) scans and show how this effect may confound attempts to use soft X-rays to characterise materials of this nature. The W4f core-level spectra revealed a progressive increase of W 5+ and W 4+ species at the expense of W 6+ as irradiation time increased. The samples developed a blue colour attributed to the presence of W 4+ and/or W 5+ . The progressive photoreduction is also associated with a shift of the W 6+ peak within the W4f spectrum to lower binding energies. This work highlights the need to consider inadvertent changes in oxidation state during X-ray photoelectron spectroscopy characterisation of samples containing photoreducible transition metals.

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“…During the photochromic process, intervalence charge transfer (IVCT, W ?6 ? W ?5 ) between tungsten oxide nanoparticles and polyglucan matrix occurs, which was supposed to be the major cause of the photochromic effect (Jing et al 2014). Photoexcitation of WO 3 leads to the transfer of electron density from the oxygen atom to the tungsten atom (O 2p -W 5d ) (Fig.…”

Section: Photochromic Properties Of Cnc/wo 3 Filmsmentioning

confidence: 99%

Highly reversible photochromism in composite WO3/nanocellulose films

et al. 2019

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Reversible photochromic hybrid organicinorganic films containing nanocrystalline cellulose as a matrix and tungsten oxide as a photochromic component (CNC/WO 3 ) were obtained via a simple and quick solvent casting method. The films were studied by scanning electron microscopy, together with element mapping, FT-IR spectroscopy and X-ray diffraction, confirming successful incorporation of WO 3 nanoparticles into a nanocellulose matrix.Thermal analysis data indicated that the modification of a nanocellulose matrix with WO 3 increases its thermal stability. The CNC/WO 3 films showed a quick coloration-bleaching transition with good reversibility within 20 min, without notable degradation of photochromic properties after 10 cycles. The synthetic method proposed allows for scalable preparation of highly efficient low-cost WO 3 -based photochromic materials.

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Fabrication and visible-light photochromism of novel hybrid inorganic–organic film based on polyoxometalates and ethyl cellulose

Cited by 28 publications

References 29 publications

Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO3 Nanoparticles

Photochromic and Photocatalytic Properties of Ultra-Small PVP-Stabilized WO3 Nanoparticles

X‐ray‐induced reduction of a surfactant/polyoxotungstate hybrid compound

Highly reversible photochromism in composite WO3/nanocellulose films

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