Optical Properties of Silver Halide Photochromic Glasses Doped with Cobalt Oxide

Shirif, M. A.; Medhat, M.; El-Zaiat, S.Y.; Fayad, A. M.; Moustafa, F. A.

doi:10.1007/s12633-016-9420-1

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…Blue color intensity increases by increasing the cobalt concentration. [ 113 ] In addition, CoO with organic compounds such as azobenzenes [ 114 ] and diarylethenes [ 115 ] are used to tune the photochromic and reversibility properties of the resulting composites based on CoO.…”

Section: Basic Principles Of Photochromism In Transition Metal Oxides and Organic Materialsmentioning

confidence: 99%

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Kayani

Kuriakose

Monshipouri

et al. 2021

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Limited levels of UV exposure can be beneficial to the human body. However, the UV radiation present in the atmosphere can be damaging if levels of exposure exceed safe limits which depend on the individual the skin color. Hence, UV photochromic materials that respond to UV light by changing their color are powerful tools to sense radiation safety limits. Photochromic materials comprise either organic materials, inorganic transition metal oxides, or a hybrid combination of both. The photochromic behavior largely relies on charge transfer mechanisms and electronic band structures. These factors can be influenced by the structure and morphology, fabrication, composition, hybridization, and preparation of the photochromic materials, among others. Significant challenges are involved in realizing rapid photochromic change, which is repeatable, reversible with low fatigue, and behaving according to the desired application requirements. These challenges also relate to finding the right synergy between the photochromic materials used, the environment it is being used for, and the objectives that need to be achieved. In this review, the principles and applications of photochromic processes for transition metal oxides and hybrid materials, photocatalytic applications, and the outlook in the context of commercialized sensors in this field are presented.

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Section: Basic Principles Of Photochromism In Transition Metal Oxides and Organic Materialsmentioning

confidence: 99%

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Kayani

Kuriakose

Monshipouri

et al. 2021

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“…1−5 Compared with organic materials, TMOs are preferable for photochromic wearables because of their higher thermal stability, strength, and chemical resistance. 6,7 Thus, various TMOs, such as molybdenum oxide (MoO 3 ), 8−10 vanadium oxide (V 2 O 5 ), 11,12 zinc oxide (ZnO), 13,14 and cobalt oxide (CoO), 15,16 have been employed in constructing photochromic materials. Despite its super stability, the color-switching of MoO 3 needs the assistance of strong oxidizing agents.…”

Section: Introductionmentioning

confidence: 99%

“…Photochromic wearables, generally consisting of fibrous materials incorporated with organic materials, inorganic transition metal oxides (TMOs), or their hybrid, have attracted tremendous attention for future rewritable ink-free media owing to their fast color-switching rates, superior reversibility, and high fatigue resistance. − Compared with organic materials, TMOs are preferable for photochromic wearables because of their higher thermal stability, strength, and chemical resistance. , Thus, various TMOs, such as molybdenum oxide (MoO 3 ), − vanadium oxide (V 2 O 5 ), , zinc oxide (ZnO), , and cobalt oxide (CoO), , have been employed in constructing photochromic materials. Despite its super stability, the color-switching of MoO 3 needs the assistance of strong oxidizing agents .…”

Section: Introductionmentioning

confidence: 99%

Chelating Coordination Regulated Photochromic Electrospun Nanofibers for Waterproof and Long-Color-Retention Rewritable Wearables

Chen,

Xu,

Han

et al. 2024

ACS Appl. Mater. Interfaces

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Photochromic materials with rapid color-switching, long color retention times, and rewritability are crucial for meeting the requirements of future rewritable ink-free media. However, these requirements are challenging to satisfy simultaneously due to the inherent constraints among these features. Herein, a novel photochromic nanofiber nonwoven fabric was designed and constructed based on a conjugated organic−inorganic hybrid structure through electrospinning and hot-pressing techniques. The as-prepared fabric can change color in merely 5 s under UV irradiation and can reach saturation within 2 min. In addition, upon the introduction of a potent metal chelator, its color retention time exceeds 14 days under ambient conditions, significantly longer than that of most rewritable materials recently reported (several hours to 5 days). Moreover, the fabric exhibits high writing resolution and can be photoprinted and heat-erased for over 100 cycles while still retaining 96% of its initial reflectivity. Hydrophobic thermoplastic polyurethane provides the fabric with excellent waterproof and antifouling properties, thus preventing the composite from swelling or collecting graffiti due to moisture or dust. This work exploits a competitive approach for designing flexible, rewritable, and superior functional wearables with practical applications.

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“…While when it acts as a glass former, it enters the network with ZnO 4 structural units [19,20] The change in color of the glasses and the change in the magnetic moment depend not only on the content of alkali oxide present but also on the nature of the transition metal and the alkali-metal oxide used [21]. Glass containing cobalt ions have intense blue color [15,21,22] and used as optical filter. Glass scientists interpreted the optical spectra of glass containing cobalt ions where a balance between tetrahedral and octahedral coordination states of cobalt ions exist in different glasses [23].…”

Section: Introductionmentioning

confidence: 99%

Optical spectroscopic study of cobalt oxide doped boron glass and its ion effect on optical properties

et al. 2019

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I N this paper, the optical spectroscopic properties of Co 3 O 4 doped borate glass with chemical composition: 60 B 2 O 3 , 30 ZnO, (10-x) Na 2 O, x Co 3 O 4 , (where x= 0 (S0), 0.1 (S1), 0.2 (S2), 0.3 (S3), 0.4 (S4), 0.5 (S5) mol %) were investigated. The glass samples (S0-S5) were prepared by conventional melt quenching technique. The formability of all prepared glass samples was examined by XRD and UV-visible spectroscopy techniques. The amorphous nature of glass structure was confirmed by XRD-technique. Archimedes method was used to measure density and calculate the molar volume of the prepared glass composition. It was observed that the density and molar volume were found to be increased by increasing concentration of Co 3 O 4. The optical spectroscopic characteristics of the obtained borate glass have been carried out over the whole range (190-2500nm) for studying the bandpass glass filter and UV cutoff. Through experimental data it was observed that the optical energy gap decreased from 3.25 to 3.03 eV by increasing doped cobalt oxide contents on borate glass. Furthermore, UV cutoff regions increased by increasing concentration of cobalt oxide. The effect of doping concentration on the optical properties of the prepared glass samples (refractive index, extinction coefficient, permittivity, dielectric constants, electric susceptibility and polarizabilities) was determined and studied.

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Optical Properties of Silver Halide Photochromic Glasses Doped with Cobalt Oxide

Cited by 10 publications

References 22 publications

UV Photochromism in Transition Metal Oxides and Hybrid Materials

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Chelating Coordination Regulated Photochromic Electrospun Nanofibers for Waterproof and Long-Color-Retention Rewritable Wearables

Optical spectroscopic study of cobalt oxide doped boron glass and its ion effect on optical properties

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