Photochromic Film Based on a Mixed-Heteroatom-Templated ErIII-Incorporated Polyoxometalate Used for Inkless Prints and Anti-Counterfeiting DOI

Yanan Chen,

Tiantian Gong,

Qiuxia Han

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 17(1), P. 1682 - 1693

Published: Dec. 25, 2024

Photochromic films have attracted increasing attention for their potential in information storage and photoswitchable devices. Developing novel photochromic materials is still a highly challenging topic. In this work, we successfully obtained an unprecedented mixed-heteroatom-templated ErIII-incorporated polyoxometalate [H2N(CH3)2]18Na2K2H12{Er2(H2O)10W14O43[SeTeW15O54][B-α-TeW9O33]2}2·117H2O (1) by concurrently introducing the [TeO3]2– [SeO3]2– heteroanion templates into Er3+/WO42– system. The most attractive feature that polyoxoanion of 1 consists three kinds building units such as classical trivacant Keggin [B-α-TeW9O33]8–, rarely seen TeIV–SeIV-oriented Dawson-like [SeTeW15O54]10–, extraordinary [W14O43]2– with infrequent [WVIO7(WVI5O20)]18– pentagon subunit. Based on photochromism polyoxometalates presence organic electron donors under light irradiation, composite film GEL/TEG/1 was fabricated mixing gelatin (GEL) triethylene glycol (TEG). shows good properties 365 nm UV irradiation. changed color within 15 min endow fast easy "'printing'" performance. "printed" text or pattern can be erased 35 h atmospheric environment at room temperature, colored quickly 3 60 °C reused printing again. Moreover, coloration decoloration process repeated least 10 cycles, indicating possesses favorable cycle Further, used ink-free anti-counterfeiting encryption. This work not only offers workable method constructing containing different uncommon but also some significant insights applications polyoxometalate-based materials.

Language: Английский

Selective Photochromism of 2,6-Di(1,6-naphthyridin-2-yl)pyridine-Based Zinc(II)-Complexes by Varying the Tethers of Dicarboxylate Coligands: Significance of Anion−π Interactions on Photo-Induced Electron Transfer DOI

Bo Ding,

Bo Hou, Zhengyu Liu

et al.

Crystal Growth & Design, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Language: Английский

Citations

0
Smart Polydimethylsiloxane Materials: Versatility for Electrical and Electronic Devices Applications DOI Open Access
Xing Yang, Wenjie Huang, Hao Dong

et al.

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract Bio‐inspired autonomous smart polydimethylsiloxane (PDMS) and its composite materials hold immense promise for a wide range of applications in electrical electronic devices. These mimic natural protective mechanisms with self‐healing, self‐reporting, self‐cleaning properties, enabling innovative efficient device design. Smart PDMS autonomously activate repair response to mechanical or damage, achieving rapid structural functional recovery preventing failure due the accumulation minor damage. can intuitively report their status through striking color changes, fluorescence, luminescence when exposed external stimuli, providing practical visual feedback health monitoring fault warning. They also have capacity effectively eliminate contaminants ice deposits from surfaces, thereby ensuring stable operation. This review aims introduce current research progress self‐cleaning, self‐reporting materials. The systematically discusses principles, methodological innovations, mechanistic analysis, these materials, highlighting significant potential field Moreover, provides an in‐depth analysis key challenges facing offers insights into future directions strategies.

Language: Английский

Citations

0
Sn-TiO₂/PTA Nanocomposite Films for High-Contrast Rewritable Media with Visible-Light-Driven Black Coloration DOI
Yao Dou,

Dongliang Wei,

Yongli Qin

et al.

Published: May 15, 2025

Photochromic materials are pivotal for rewritable smart media, yet conventional systems suffer from sluggish kinetics, UV dependency, and low optical contrast. Herein, we present a visible-light-responsive Sn-TiO2/phosphotungstic acid (PTA) nanocomposite film mediated by polyvinylpyrrolidone (PVP) that addresses these challenges through interfacial engineering bandgap modulation. Sn-doped TiO2 nanoparticles, synthesized hydrothermally, covalently linked to phosphotungstic clusters via PVP-assisted dispersion, enabling efficient charge separation under 450 nm illumination. The Sn-TiO2/PTA/PVP achieves ultrafast coloration within 10 s, attributed the reduction of W6⁺ W5⁺ in PTA. colored state exhibits remarkable air stability (48 h) rapid recovery (<30 min) H2O2 vapor, sustaining >80 reversible cycles without degradation. With narrowed (2.23 eV) broadband intervalence transfer (IVCT) absorption (600–800 nm), demonstrates high-contrast black-state 2-day legibility as medium. This work overcomes limitations organic dyes UV-dependent systems, offering an inorganic, eco-friendly platform displays, anti-counterfeiting labels, energy-efficient photochromic technologies.

Language: Английский

Citations

0
Transparent Photochromic Coatings for Smart Windows and Information Storage DOI

Weining Liu,

Yuting Tian, Wanxiong Yong

et al.

Macromolecular Chemistry and Physics, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 15, 2024

Abstract Organic–inorganic composite photochromic coatings receive significant attention in energy utilization and conservation due to their easy application rapid photoresponse. However, high sensitivity moisture limits practical applications. This study fabricates organic–inorganic functional using a simple one‐pot method, producing materials with excellent photoresponsive, water resistance, thermal insulation. Unmodified phosphotungstic acid serves as the inorganic filler, while methacrylate derivatives act polymer matrix, resulting initial transparency (over 85%). After 5 min of UV exposure, samples shift nearly non‐transmittable states visible range maintain color depth through 14 coloring‐erasing cycles. Unlike polyvinylpyrrolidone substrates, which absorb soften quickly, this coating has static contact angle up 91.7°, showing resistance. Additionally, material provides effective heat insulation simulated chamber experiments, lowering temperature by 15 °C compared untreated chambers. In summary, coating, its insulation, light responsiveness, stable cycling performance, outstanding waterproof capabilities, proves highly suitable for applications such smart windows, information storage, building efficiency.

Language: Английский

Citations

0
Photochromic Film Based on a Mixed-Heteroatom-Templated ErIII-Incorporated Polyoxometalate Used for Inkless Prints and Anti-Counterfeiting DOI

Yanan Chen,

Tiantian Gong,

Qiuxia Han

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 17(1), P. 1682 - 1693

Published: Dec. 25, 2024

Photochromic films have attracted increasing attention for their potential in information storage and photoswitchable devices. Developing novel photochromic materials is still a highly challenging topic. In this work, we successfully obtained an unprecedented mixed-heteroatom-templated ErIII-incorporated polyoxometalate [H2N(CH3)2]18Na2K2H12{Er2(H2O)10W14O43[SeTeW15O54][B-α-TeW9O33]2}2·117H2O (1) by concurrently introducing the [TeO3]2– [SeO3]2– heteroanion templates into Er3+/WO42– system. The most attractive feature that polyoxoanion of 1 consists three kinds building units such as classical trivacant Keggin [B-α-TeW9O33]8–, rarely seen TeIV–SeIV-oriented Dawson-like [SeTeW15O54]10–, extraordinary [W14O43]2– with infrequent [WVIO7(WVI5O20)]18– pentagon subunit. Based on photochromism polyoxometalates presence organic electron donors under light irradiation, composite film GEL/TEG/1 was fabricated mixing gelatin (GEL) triethylene glycol (TEG). shows good properties 365 nm UV irradiation. changed color within 15 min endow fast easy "'printing'" performance. "printed" text or pattern can be erased 35 h atmospheric environment at room temperature, colored quickly 3 60 °C reused printing again. Moreover, coloration decoloration process repeated least 10 cycles, indicating possesses favorable cycle Further, used ink-free anti-counterfeiting encryption. This work not only offers workable method constructing containing different uncommon but also some significant insights applications polyoxometalate-based materials.

Language: Английский

Citations

0