Reversible photochromic effect in the TiO2—polymer hybrid system

Tandy, Ll. M. Flores; Bueno, J.; Vong, Yunny Meas; Torres, I. Zamudio; Lartundo-Rojas, L.; Torres, Claudia Jazmín Ramos; Martínez‐Gutiérrez, Hugo; López, Maria Luisa Mendoza

doi:10.1007/s10971-016-4292-9

Cited by 11 publications

(7 citation statements)

References 18 publications

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“…The hole left behind is usually scavenged by different polymers, solvents, or organic adsorbates suspending the TiO 2 nanoparticles such as glycerol, butanol, isopropanol, or methanol (Equation ). [ 106 ] The optical absorption gaps of anatase and rutile TiO 2 are 3.2 and 3.0 eV, [ 23 ] which correspond to wavelengths of approximately 413 nm and 387 nm, respectively. Hence, photoactivation of TiO 2 can be achieved by irradiation with UV and visible wavelengths as well.…”

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

confidence: 99%

Section: Photochromic Applications Of Oxides and Hybrid Materials In Uv Sensingmentioning

confidence: 99%

“…PMMA–TiO 2 composites synthesized by sol‐gel methods with IPA exhibited a chromic change from clear to dark yellow (Figure 7b). [ 23 ] The color returns to its initial state in the absence of light and the process is reversible as long as their photons with energy higher than the bandgap and Ti (OOH) are present. As materials are depleted of their Ti(OOH) domains, they no longer become photochromic.…”

Section: Photochromic Applications Of Oxides and Hybrid Materials In Uv Sensingmentioning

confidence: 99%

“…These involve structural and morphological control of preparation, [ 15,16 ] employing advanced micro/nanofabrication techniques, [ 17,18 ] compositing oxides with organic materials, [ 19 ] compositing of several oxides, [ 20 ] elemental doping, [ 21 ] and embedding chromic oxide materials into polymer matrices. [ 22,23 ] These techniques have enhanced the performance of photochromic oxides in terms of sensitivity, [ 24 ] responsivity, [ 25 ] flexibility, [ 26 ] and dynamic range. [ 27 ] In terms of wavelength selectivity, the photochromic oxide transformation has been extended from narrow [ 28 ] to larger spectral bandwidths [ 29 ] with tunable capabilities.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Photochromic Applications Of Oxides and Hybrid Materials In Uv Sensingmentioning

confidence: 99%

Section: Photochromic Applications Of Oxides and Hybrid Materials In Uv Sensingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Kayani

Kuriakose

Monshipouri

et al. 2021

Small

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“…However, so far solid polymer composite systems have been proposed. Different photochromic systems based on TiO 2 and polymers, such as, urethane resin [16], polymethyl methacrylate (PMMA) [21] and polyvinyl alcohol (PVA) [22] has been demonstrated. However, these are slow and provides small total change in transmittance due to a slow hole scavenging rate.…”

Section: Introductionmentioning

confidence: 99%

Photochromic TiO2/PEGDA organogels

Eglı̅tis

Šutka

2022

Photochem Photobiol Sci

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Photochromic materials can be used for modulation of the visible and infrared light transmittance for providing privacy or energy saving by blocking the heat. Titanium dioxide (TiO 2 ) nanoparticles has been well reported as a promising photochromic material. However, a high photochromic response from TiO 2 can be observed only when the nanoparticles are dispersed in a strong photogenerated hole scavenger at a liquid state, but polymer composites are less responsive due to lack of hole scavenging capability. However, it is intricate to apply suspensions in real window devices because of possible leaking. Here, we describe the preparation of TiO 2 quantum dot (QD)-based gels from polyethylene glycol diacrylate (PEGDA), N,N-Dimethylformamide (DMF), and ethanol (EtOH). Photochromic gels with TiO 2 contents (1-5 volume%) show performance comparable to their colloidal counterparts with capable of photodarkening within 30 min with a transmittance change ranging from 35.8 to 84.5% at 550 nm. These gels were capable of fully recovering the initial transmittance when not exposed to ultraviolet (UV) light within 3-8 h. The photochromic gel systems with ethanol shows reasonable stability by decreasing in transmittance recovery only by less than 10% in 10 cycles. A potential application for the developed photochromic gels can be photochromic windows.

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Self‐Healing Photochromic Elastomer Composites for Wearable UV‐Sensors

Yimyai

Crespy

Pena‐Francesch

2023

Adv Funct Materials

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Photochromic materials have recently received strong interest for the development of wearable ultraviolet (UV) detection technologies because they do not require electronic components, resulting in systems and devices that change color upon irradiation. However, their implementation in wearable technology has lightweight, compliance, and durability (especially under mechanical stress) requirements that are limited by the materials’ properties. Here, a self‐healing photochromic elastomer composite (photoPUSH) consisting of phosphomolybdic acid (PMA) in a self‐healing polyurethane dynamic network with reversible disulfide bonds (PUSH) is presented. The unique properties of the dynamic polymer matrix enable multiple complementary functions in the UV‐sensing composite: i) photochromism via electron donor groups without requiring additional dopants, ii) stretchability and durability via elastomeric properties, iii) healing of extreme mechanical damage via dynamic bonds, and iv) multimaterial integration via adhesive properties. PhotoPUSH composites exhibit excellent durability, tunable sensing range, and no loss of performance under mechanical stress and severe damage, as well as in underwater environments (waterproof). Leveraging these properties, soft, portable, multimaterial photoPUSH‐based UV‐sensing devices are developed for applications in environmental monitoring, packaging, and healthcare wearable technology (including skin‐mounted, textile‐mounted, and wristband devices) in challenging environments and tunable to different skin types.

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Reversible photochromic effect in the TiO2—polymer hybrid system

Cited by 11 publications

References 18 publications

UV Photochromism in Transition Metal Oxides and Hybrid Materials

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Photochromic TiO2/PEGDA organogels

Self‐Healing Photochromic Elastomer Composites for Wearable UV‐Sensors

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