Investigation on the microstructural, optical, electrical, and photocatalytic properties of WO3 nanoparticles: an effect of Ce doping concentrations

Mohanraj, M.; Ashraf, I. M.; Shkir, Mohd.; Minnam Reddy, Vasudeva Reddy; Kim, Woo Kyoung

doi:10.1007/s10854-023-11386-7

Cited by 1 publication

(1 citation statement)

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“…WO 3 is an n-type semiconductor with a variety of applications, which span from gas sensors to smart windows [ 20 ], thanks to its peculiar and interesting characteristics, including photochromism [ 20 , 21 ]. In particular, it has been reported that WO 3 modulates its optical properties under the effect of external light [ 22 ] because of an electron–proton double injection [ 23 ] that leads to the valence state transformation from W 6+ to W 5+ [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

The Role of WO3 Nanoparticles on the Properties of Gelatin Films

Rubini,

Menichetti,

Cassani

et al. 2024

Gels

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Gelatin films are very versatile materials whose properties can be tuned through functionalization with different systems. This work investigates the influence of WO3 nanoparticles on the swelling, barrier, mechanical, and photochromic properties of gelatin films. To this purpose, polyvinylpirrolidone (PVP)-stabilized WO3 nanoparticles were loaded on gelatin films at two different pH values, namely, 4 and 7. The values of swelling and solubility of functionalized films displayed a reduction of around 50% in comparison to those of pristine, unloaded films. In agreement, WO3 nanoparticles provoked a significant decrease in water vapor permeability, whereas the decrease in the values of elastic modulus (from about 2.0 to 0.7 MPa) and stress at break (from about 2.5 to 1.4 MPa) can be ascribed to the discontinuity created by the nanoparticles inside the films. The results of differential scanning calorimetry and X-ray diffraction analysis suggest that interaction of PVP with gelatin reduce gelatin renaturation. No significant differences were found between the samples prepared at pH 4 and 7, whereas crosslinking with glutaraldehyde greatly influenced the properties of gelatin films. Moreover, the incorporation of WO3 nanoparticles in gelatin films, especially in the absence of glutaraldehyde, conferred excellent photochromic properties, inducing the appearance of an intense blue color after a few seconds of light irradiation and providing good resistance to several irradiation cycles.

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