Chiroptical Nanocellulose Bio‐Labels for Independent Multi‐Channel Optical Encryption

Small, Год журнала: 2023, Номер 19(32)

Опубликована: Май 10, 2023

Abstract Advanced multiplexing optical labels with multiple information channels provide a powerful strategy for large‐capacity and high‐security encryption. However, current face challenges of difficulty to realize independent multi‐channel encryption, cumbersome design, environmental pollution. Herein, chiroptical bio‐labels integrating elements, including structural color, photoluminescence (PL), circular polarized light activity, humidity‐responsible micro/nano physical patterns, are constructed in complex design based on host‐guest self‐assembly cellulose nanocrystals bio‐gold nanoclusters. The thin nanocellulose exhibit tunable color crossover the entire visible wavelength circularly PL highest‐recorded dissymmetry factor up 1.05 due well‐ordered chiral organization templated gold Most importantly, these elements can independently encode customized anti‐counterfeiting achieve five high‐level anti‐counterfeiting, which rarely achieved traditional materials counterparts. Considering exceptional seamless integration encryption recyclable features labels, have great potential next generation technology.

Язык: Английский

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A Disposable Thermally Triggered Photonic Crystal Anti‐Counterfeiting Tag with Irreversible Response and Multi‐Step Color Changes

Small, Год журнала: 2024, Номер 20(30)

Опубликована: Фев. 17, 2024

Abstract Thermochromic photonic crystal (PC) is a promising material for anti‐counterfeiting applications, but there are still challenges to further improve the performance and practicability in usage. Here, disposable thermally triggered PC tag with irreversible response multi‐step color changes developed based on thermochromic Silica/(Polyethylene glycol‐Ethoxylated trimethylolpropane triacrylate) (SiO 2 /(PEG‐ETPTA)) double‐layer film. The fast thermal come from quick melting infiltration of PEG‐ETPTA into PCs upon heating. change at different temperatures originated regioselective control UV curing degree layer resulting temperature Therefore, invisible pattern can be revealed part by heating became again after overheating, which offered diversified visual effects enhanced performances.

Язык: Английский

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Highly‐Polarized Solar‐Blind Ultraviolet Organic Photodetectors

Advanced Materials, Год журнала: 2024, Номер 36(32)

Опубликована: Июнь 4, 2024

Abstract Developing high‐performance polarization‐sensitive ultraviolet photodetectors is crucial for their application in military remote sensing, detection, bio‐inspired navigation, and machine vision. However, the significant absorption visible light range severely limits of photodetectors, such as high‐quality anti‐interference imaging. Here, based on a wide‐bandgap organic semiconductor single crystal (trans‐1,2‐bis(5‐phenyldithieno[2,3‐b:3′,2′‐d]thiophen‐2‐yl)ethene, BPTTE), solar‐blind with dichroic ratio close to 4.26 are demonstrated. The strong anisotropy 2D grown BPTTE crystals molecular vibration optical characterized by various techniques. Under voltage modulation, stable efficient detection polarized demonstrated, attributed intrinsic transition dipole moment bc plane, rather than other factors. Finally, high‐contrast polarimetric imaging successfully demonstrated highlighting potential semiconductors photodetectors.

Язык: Английский

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Physically Unclonable Holographic Encryption and Anticounterfeiting Based on the Light Propagation of Complex Medium and Fluorescent Labels

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(2), С. 2888 - 2901

Опубликована: Янв. 2, 2024

Physically unclonable function (PUF) methods have high security, but their wide application is limited by complex encoding, large database, advanced external characterization equipment, and complicated comparative authentication. Therefore, we creatively propose the physically holographic encryption anticounterfeiting based on light propagation of medium fluorescent labels. As far as know, this first method with a fluorescence property. The proposed reduces above requirements traditional PUF significantly cost. angle-multiplexed label physical secret key. information encrypted computer-generated holograms (CGH). Many parameters in system are used parameter keys. Diffie–Hellman key exchange algorithm improved to transfer A variety hologram generation compared. effectiveness, robustness studied analyzed. Finally, graphical user interface (GUI) designed for convenience users. advantages include lower encoding complexity, effective reduction database size, direct use decrypted without authentication reduce misjudgment. It believed that paper will pave way popularization PUF-based methods.

Язык: Английский

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Designing Yolk–Shell Nanostructures for Reversible Water-Vapor-Responsive Dual-Mode Switching of Fluorescence and Structural Color

ACS Nano, Год журнала: 2024, Номер 18(5), С. 4456 - 4466

Опубликована: Янв. 26, 2024

Metal halide perovskites offer ample opportunities to develop advanced optoelectronic devices. This work showcases that the integration of metal into oxide nanoshells with controllable interior cavities can enable water-vapor-responsive dual-mode switching fluorescence and structural color. Through a ship-in-a-bottle method introduce controlled amount CsPbBr3 MnO2 nanoshells, we have designed CsPbBr3@MnO2 yolk–shell nanostructures, which uptake defined water exhibit rapid (less than 1 s) reversible (≥100 cycles) responses in both on–off color change when exposed dynamic vapor. These originate from water-triggered phase transformation CsPb2Br5 shell. The altered electronic bonding structure at oxide–halide interface, accumulation cavity, protective effect shell facilitate transformations. response characteristics nanostructures been further demonstrated fabricating patterned films capable multiple fluorescence/structural responses, highlighting their potential for applications anticounterfeiting encryption.

Язык: Английский

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