Spectral and Color Changes of Ag/TiO<sub>2</sub> Photochromic Films Deposited on Diffusing Paper and Transparent Flexible Plastic Substrates

Diop, D. K.; Simonot, Lionel; Martínez-García, Juan Carlos; Hébert, Mathieu; Lefkir, Yaya; Abadias, G.; Guérin, Philippe; Babonneau, David; Destouches, Nathalie

doi:10.1177/0003702816680000

Cited by 15 publications

(13 citation statements)

References 28 publications

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“…So, this effect has been investigated previously for several metal oxides (e.g., WO 3 , MoO 3 , TiO 2 , V 2 O 5 , Nb 2 O 5 , ZnO, etc.) . Coloration performance of a photochromic material can be mainly enhanced by restraining the recombination of the photoexcited carriers .…”

Section: Introductionmentioning

confidence: 99%

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Badr

Afify

El-Anssary

et al. 2019

Crystal Research and Technology

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A modified spray pyrolysis technique is used for preparing α‐MoO3 thin films after subsequent heat treatment at a relatively low temperature. The spray parameters are selected through a wide variety of elaboration conditions for best photochromic features. Different numbers of spraying and drying cycles are performed to investigate the thickness effect on the structural, morphological, optical, electrical, and photo‐electrical properties of the nanostructured α‐MoO3 films. These film samples are characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM), and thus the film thickness effect is elucidated and correlated to the crystallite shape and size. The SEM micrographs show fibrous‐reticulated morphology for all the film samples investigated here. The photochromic properties of α‐MoO3 sprayed thin films are investigated by measuring the transmission spectra before and after UV‐light exposure. The changes in the optical transmission of these film samples are monitored for different exposure times. The UV exposure time effect as well as the thickness effect on the photochromic response of the film samples is investigated and discussed based on the particle size analysis. The photosensitivity is evaluated in various illumination levels to elucidate the carrier transport in the α‐MoO3 films and to determine the type of the recombination processes in these films.

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Section: Introductionmentioning

confidence: 99%

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Badr

Afify

El-Anssary

et al. 2019

Crystal Research and Technology

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“…The most commonly used design is metal‐insulator‐metal (MIM) film stacks, where the layer is nanopatterned by complicated lithographic procedures. Compared to the abovementioned colors based on electronic structure or the plasmonic effect, which are impractical to industrialize due to the complexity, durability and limited size, a metal‐based reflective color filter is indeed a widely applicable approach to achieve various colors by utilizing optical interference effects in planar thin‐film structures . This approach provides unique features, such as nonfading, color tenability, and high color brightness, rendering it useful in various practical applications.…”

Section: Introductionmentioning

confidence: 99%

Full‐Color Reflective Filters in a Large Area with a Wide‐Band Tunable Absorber Deposited by One‐Step Magnetron Sputtering

Lyu

et al. 2019

Advanced Optical Materials

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Full‐color reflective filters for large area applications with potentially unprecedented color saturation and excellent mechanical properties deposited by one‐step magnetron sputtering are proposed. Conventional reflective color filters with multiple layers of dielectric films cannot simultaneously produce a large area and good mechanical properties due to the complex multiple depositions and the difference in the thermal expansion coefficients among the material layers. Herein, full‐spectrum colors are generated by novel Mg‐based reflective color filters in a large area of 2 cm × 2 cm with a high hardness of 9.12 GPa, where the filters include an absorber layer with controllable optical constants and a reflective layer with an amorphous structure. The saturation and hue of the produced colors can be controlled by tuning the optical constants and the thickness of the absorber layer. Additionally, the hardness of the Mg‐based reflective color filters is increased by the reflective metallic glass layers because they are derived from the same material as the absorber layer. This paradigm can pave the way for the efficient fabrication of large area color filtering devices for diverse applications, such as surface decorations, optical components, color display devices, structural color printing, and photovoltaic cells with optimum efficiency.

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“…The scanning continuous-wave (CW) laser beam is used because both material heating and NP properties such as size and distribution can be better controlled in this case. This effect is particularly promising for color printing . Previously, the growth of Ag NPs in mesoporous films of amorphous TiO 2 was investigated as a function of scanning speed for different laser powers and focusing.…”

Section: Introductionmentioning

confidence: 99%

“…This effect is particularly promising for color printing. 16 Previously, the growth of Ag NPs in mesoporous films of amorphous TiO 2 was investigated as a function of scanning speed for different laser powers and focusing. The first developed model 13 was able to simulate the experimentally observed phenomenon showing that NPs grow only above a speed threshold and tend to oxidize below this threshold.…”

Section: ■ Introductionmentioning

confidence: 99%

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

Bakhti

Rudenko

et al. 2019

J. Phys. Chem. C

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Controlling the formation of nanoparticles (NPs) by direct laser writing ensures an efficient way of engineering the optical responses of nanocomposite materials through adjusting laser parameters such as power, focusing, and writing speed. The growth of NPs, photooxidation, and reduction affect the light absorption by an ensemble of laser-activated NPs. However, those self-consistent processes are not well understood. Previous studies explained the growth or shrinkage of silver NPs by neglecting heat diffusion. It remained unclear, however, how the NP size can be controlled by the laser writing speed. In this work, based on the coupled calculations of size variation, heat diffusion, and light absorption by an ensemble of NPs, we propose a two-dimensional model taking into account the spatial information of size and temperature. The spatial size distribution is revealed to be nonuniform, leading to the transmission inhomogeneity along the laser written lines. This fact is confirmed by the in situ transmission experiments. The performed study also depicts a novel view in which NPs grow ahead of the laser beam center because of the heat diffusion. The nonlinear growth never stops until it exhausts the majority of the free Ag 0 in the matrix, while the amount of Ag 0 by reduction cannot compensate the consumption. After that, the photo-oxidation dominates the process and finally controls the writing speed dependency of NP's size. The simulations also show that it is not the activation energy of Ag 0 diffusion, but the ionization efficiency affects the final NP size, which helps to understand how to improve the laser processing of differently prepared samples.

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Spectral and Color Changes of Ag/TiO₂ Photochromic Films Deposited on Diffusing Paper and Transparent Flexible Plastic Substrates

Cited by 15 publications

References 28 publications

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Full‐Color Reflective Filters in a Large Area with a Wide‐Band Tunable Absorber Deposited by One‐Step Magnetron Sputtering

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction

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Spectral and Color Changes of Ag/TiO2 Photochromic Films Deposited on Diffusing Paper and Transparent Flexible Plastic Substrates

Cited by 15 publications

References 28 publications

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO3 Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO3 Thin Films Prepared by Modified Spray Pyrolysis Technique

Full‐Color Reflective Filters in a Large Area with a Wide‐Band Tunable Absorber Deposited by One‐Step Magnetron Sputtering

Laser-Generated Ag Nanoparticles in Mesoporous TiO2 Films: Formation Processes and Modeling-Based Size Prediction

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Spectral and Color Changes of Ag/TiO₂ Photochromic Films Deposited on Diffusing Paper and Transparent Flexible Plastic Substrates

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Photochromic Response and Steady‐State Photoconductivity of Fibrous‐Reticulated α‐MoO₃ Thin Films Prepared by Modified Spray Pyrolysis Technique

Laser-Generated Ag Nanoparticles in Mesoporous TiO₂ Films: Formation Processes and Modeling-Based Size Prediction