Light-responsive color switching of self-doped TiO2−x/WO3·0.33H2O hetero-nanoparticles for highly efficient rewritable paper

Zhao, Jingmei; Liu, Luntao; Zhang, Yun; Feng, Zhenyu; Zhao, Feifei; Wang, Wenshou

doi:10.1007/s12274-020-3061-9

Cited by 39 publications

(19 citation statements)

References 44 publications

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“…25,26 The formation of oxygen vacancies is generally induced by Ti 3+ substitution of Ti 4+ in the TiO 2−x nanoparticles to compensate the charge imbalance. 27 In the C 1s region, the peaks located at 288.2, 285.4, and 284.6 eV are due to C−O−Ti, C−O, and C−C in the TiO 2−x nanoparticles, respectively (SI Figure S5b). 28,29 The N 1s peak at 400.1 eV is assigned to the molecular N 2 absorbed on the surface or interstitial nitrogen dopant while the peak at 398.8 eV is ascribed to the adsorbed ammonia (Figure 2c).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The Ti signal can be deconvoluted by using the multi-Gaussian function into Ti 3+ (at 457.4 and 462.9 eV) and Ti 4+ (at 458.0 and 463.8 eV), respectively, demonstrating the existence of Ti 3+ species in the typical nanoparticles . The XPS spectrum of O 1s shows four peaks at 529.1, 530.5, 531.5, and 532.1 eV, which are assigned to the Ti–O bond, C–O–Ti, the oxygen of surface hydroxyl groups and oxygen vacancies, respectively (Figure b). , The formation of oxygen vacancies is generally induced by Ti 3+ substitution of Ti 4+ in the TiO 2– x nanoparticles to compensate the charge imbalance . In the C 1s region, the peaks located at 288.2, 285.4, and 284.6 eV are due to C–O–Ti, C–O, and C–C in the TiO 2– x nanoparticles, respectively (SI Figure S5b).…”

Section: Resultsmentioning

confidence: 99%

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On-Demand Regulation of Photoreversible Color Switching for Rewritable Paper and Transient Information Encryption

Zhang

Feng

et al. 2021

ACS Appl. Mater. Interfaces

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The achievement of photoreversible color switching systems (PCSS) has offered great opportunities for fundamental studies and practical applications. However, the development of PCSS that possessing highly reversible cyclability and on-demand regulation of recoloration process remains a grand challenge. Herein, we report a hydrazine-mediated self-doping strategy for the synthesis of alkaline Ti 3+ self-doped TiO 2−x nanoparticles, enabling the TiO 2−x nanoparticles/methylene blue based PCSS with long photoreversible cyclability and rapid color switching rate. The Ti 3+ species as internal sacrificial electron donors significantly improve the photoreductive activity of TiO 2−x nanoparticles, which results in fast decoloration rate and long cycling number of the PCSS. Simultaneously, the alkaline property of TiO 2−x nanoparticles enhances the oxidation kinetics of the PCSS to dramatically accelerate the recoloration rate. Moreover, the PCSS can be integrated elaborately with biodegradable agarose to form flexible color switching films, which exhibit long-waited on-demand regulation of recoloration rate in a wide range. By taking advantage of photoreversible color switching and time-resolved color changing process, we demonstrate their potential application in self-erasing rewritable paper and transient optical information encryption. This work represents a new strategy for the future development of PCSS and their advanced applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

On-Demand Regulation of Photoreversible Color Switching for Rewritable Paper and Transient Information Encryption

Zhang

Feng

et al. 2021

ACS Appl. Mater. Interfaces

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“…We have recently reported photoreductive titania/hydrated tungsten oxide (THTO) heteronanoparticles, which exhibit a super outstanding photoreversible color-switching property under UV irradiation. 34 Since both titania and hydrated tungsten oxide are wide-band-gap semiconductors perfectly corresponding to solar UV radiation, we conjecture that the THTO heteronanoparticles are an alternative for designing solar UV radiation monitors with excellent sensitivity and selectivity to solar UV radiation. Herein, we report on the design and development of a new solar UV radiation monitor by integrating sunlight-responsive color-switchable THTO heteronanoparticles with the sticker paper substrate.…”

Section: ■ Introductionmentioning

confidence: 98%

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Zhao

Zhang

Liu

et al. 2022

ACS Appl. Nano Mater.

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Excessive exposure to ultraviolet (UV) rays in sunlight is harmful to human skin. The development of an intelligent UV monitor that can detect the solar UV intensity in real time is highly desirable for human health and safety. In this work, a sunlight-responsive paper-based color-switching film (PCSF) is developed by combining color-switchable titania/hydrated tungsten oxide (THTO) heteronanoparticles with a sticker paper substrate. The THTO heteronanoparticles with an average size of 10 nm are distributed tightly on the surface of the paper substrate. Owing to the advantages of the excellent sensitivity and selectivity to solar UV radiation of THTO heteronanoparticles and the high flexibility of the paper substrate, the PCSF shows great potential for solar UV radiation monitors. With the solar UV intensity increasing from 0.75 to 3.25 mW•cm −2 , the color of PCSF changes from colorless to blue and even dark blue. Moreover, the color change of the PCSF under solar UV irradiation featuring 40 s is calibrated to indicate the solar UV radiation intensity. Taking the advantage of the excellent sensitivity and selectivity to solar UV radiation, high reversibility, flexibility, and low cost, we further demonstrate the application of the PCSF as a reusable wristband for smart solar UV radiation monitors. This work provides a way for solar UV radiation monitors that could provide naked-eye monitoring of real-time personal solar UV radiation.

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“…Many research efforts have focused on the production of electrochromic materials (ECMs), such as transition metal oxides [7], polymers [8,9], and small organic molecules [10]. Tungsten oxide (WO 3 ) is a widely studied inorganic ECM because its superior optical memory and cyclic as well as environmental stability can meet commercial requirements [11,12]. Polythiophenes and their derivatives with low-power consumption, facile color tunability through molecular design, and high processability of highly flexible are among the most promising conjugated polymers for the manufacture of electrochromic (EC) devices [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion

et al. 2021

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Electrochromic (EC) materials that change color with voltage have been widely studied for use in dynamic windows. However, colorless-to-colorful switching with high contrast ratio is generically unattainable, especially for colorless-to-black electrochromic materials with an ultrahigh contrast ratio over the entire visible region. In this work, we developed Nb1.33C MXene-based dynamic windows with colorless-to-black switching of up to 75% reversible change in transmittance from 300 to 1,500 nm. By exploring the electrochromic effects of different electrolytes through in situ optical changes and electrochemical quartz crystal microbalance (EQCM), it is found that electrochromic behavior is greatly influenced by the extent of reversible Li+ insertion/deinsertion between the two-dimensional Nb1.33C MXene nanosheets. In addition, a colorless-to-black EC device based on Nb1.33C with an overall integrated contrast ratio over 80% was successfully constructed by a solution-processable spin coating method. This work enables a simple route to fabricate MXene-based high-performance electrochromic smart windows, which is important for further expanding the application of MXenes to optoelectronic and photonic applications.

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Light-responsive color switching of self-doped TiO2−x/WO3·0.33H2O hetero-nanoparticles for highly efficient rewritable paper

Cited by 39 publications

References 44 publications

On-Demand Regulation of Photoreversible Color Switching for Rewritable Paper and Transient Information Encryption

On-Demand Regulation of Photoreversible Color Switching for Rewritable Paper and Transient Information Encryption

Sunlight-Responsive Titania–Hydrated Tungsten Oxide Heteronanoparticles/Paper-Based Color-Switching Film for Solar Ultraviolet Radiation Monitors

Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion

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