Highly reversible photochromism in composite WO3/nanocellulose films
Reversible photochromic hybrid organic–inorganic films containing nanocrystalline cellulose as a matrix and tungsten oxide as a photochromic component (CNC/WO3) 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 WO3 nanoparticles into a nanocellulose matrix. Thermal analysis data indicated that the modification of a nanocellulose matrix with WO3 increases its thermal stability. The CNC/WO3 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 WO3-based photochromic materials.
KeywordsNanocellulose Tungsten oxide Composite Photochromism Film
The work was supported by the Russian Science Foundation (Grant No. 18-73-10150). The electron microscopy and energy-dispersive X-ray spectroscopy measurements were performed using shared experimental facilities supported by IGIC RAS state assignment.
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Conflicts of interest
There are no conflicts of interest to declare.
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