Recent advances in flexible sensors: From sensing materials to detection modes

TrAC Trends in Analytical Chemistry, Год журнала: 2024, Номер unknown, С. 118027 - 118027

Опубликована: Окт. 1, 2024

Язык: Английский

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Modulating Linker Conjugation and Flexibility of Aggregation‐Induced Emission Covalent Organic Framework for Enhanced Luminescence

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 6, 2025

Abstract In order to inhibit non‐radiative decay pathways of covalent‐organic frameworks (COFs), a strategy is proposed block intralayer conjugation and interlayer π–π stacking by using flexible aggregation‐induced emission (AIE) building blocks (4′,4′′′,4′′′′′,4′′′′′′′‐(1,2‐ethenediylidene) tetrakis[1,1′‐biphenyl]‐4‐carbaldehyde (TFBE)) connected weakly conjugated linker. By the TFBE as changing flexibility linker, TFBE‐COFs with different luminescence properties are obtained. Experimental theoretical results show that these have high crystallinity large layer spacing, among which photoluminescence quantum yield hydrazone (Hz)‐COF TFBE‐ODH (oxalyl dihydrazide (ODH)) in solid state reaches 26.28%, superior most COFs reported so far. The excellent attributed non‐planar geometry TFBE, inhibits quenching. Moreover, π‐electron delocalization‐induced leaps suppressed further enhances TFBE‐COFs. Hz‐COF exhibits sensing performance for trace tetracycline, detection limit 0.15 µ m . addition, white light‐emitting diodes coated manufactured achieve high‐quality light emission. This study provides new design application high‐emission COFs.

Язык: Английский

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Helicene Covalent Organic Frameworks for Robust Light Harvesting and Efficient Energy Transfers

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(45)

Опубликована: Июль 18, 2024

Abstract Helicenes represent a class of fascinating π compounds with fused yet folded backbones. Despite their broad structural diversity, harnessing helicenes to develop well‐defined materials is still formidable challenge. Here we report the synthesis crystalline porous helicene by exploring synthesize covalent 2D lattices and layered frameworks. Topology‐directed polymerization [6]helicenes porphyrin creates networks alternate helicene‐porphyrin alignment along x y directions at 1.5‐nm interval develops [6]helicene frameworks through reversed anti‐AA stack z direction form segregated columnar arrays. Notably, this configuration enables be highly red luminescent benchmark quantum yields. The trigger effieicnt intra‐framework singlet‐to‐singlet state energy transfer from facilitate intermolecular triplet‐to‐triplet molecular oxygen produce reactive species, harvesting wide range photons ultraviolet near‐infrared regions for light emitting photo‐to‐chemical conversion. This study introduces new family extended frameworks, laying groundwork unprecedented structures functions.

Язык: Английский

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Photo‐Controllable Förster Resonance Energy Transfer Based on Dynamic Chiral Self‐Assembly of Sequence‐Defined Amphiphilic Alternating Azopeptoids

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 8, 2025

Abstract Endowing biomimetic sequence–controlled polymers with chiral functionality to construct stimuli‐responsive materials offers a promising approach for innovative chiroptical switch, but it remains challenging. Herein, is reported that the self‐assembly of sequence‐defined amphiphilic alternating azopeptoids generate photo‐responsive and ultrathin bilayer peptoidosomes vesicular thickness ≈1.50 nm diameter around ≈290 nm. The photoisomerization azobenzene moiety facilitates reversible structural transformation from isotropic anisotropic 1D helical nanoribbons (≈80 width) under irradiation UV visible lights, consequently leading chirality expression transfer asymmetric center achiral units. As model deformation‐induced energy transfer, non‐invasive azobenzene‐based Förster resonance system unprecedentedly constructed via introduction fluorescent donor pyrene derivatives sequentially photo‐regulated donor/acceptor ratio, displaying gradient color variation blue yellow (a broad Stokes shift ≈200 nm) high‐efficient efficiency 97.2%. photo‐controllable photoluminescence phenomenon endows these aggregates proof‐of‐concept application on multi‐colored information encryption. This work provides prospective strategy fabricate potential light‐controllable switches.

Язык: Английский

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Morphology transition engineering on MgO for enhanced dye adsorption without using surfactants as sacrifice templates

Journal of Magnesium and Alloys, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский

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Density functional theory calculations on the solvatochromism of covalent organic framework Py-TT cluster compounds

Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences, Год журнала: 2025, Номер 481(2311)

Опубликована: Апрель 1, 2025

Covalent organic frameworks (COFs) are stable porous materials linked by covalent bonds and have been the subject of considerable interest for a number diverse applications, including catalysis, energy optics. This study examined solvent discoloration mechanism COF Py-TT cluster in variety environments. Furthermore, density functional theory was employed to ascertain spectral absorption characteristics hole–electron attributes clusters. These findings indicate that has minimal effect on pore area Py-TT; however, polarity subtle influence diagonal structure. Additional calculations spectrum indicated induces redshift spectrum, with greater occurring solvents higher polarity, accompanied an increase intensity. Hole–electron distribution analysis excited state comprehensive excitation holes electrons, significant overlap. The increased resulted centres electrons moving away from each other, thereby reducing However, this also weakening Coulomb interaction, which facilitated electron transfer caused shift towards red end visible spectrum.

Язык: Английский

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Regulating the Azo‐Functionalization of Covalent Organic Frameworks for Photo‐Modulated Adsorption and Sensing of Aniline

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

Abstract Photoresponsive materials have garnered considerable attention, particularly azo‐functionalized covalent organic frameworks (COFs), due to their unique ability undergo cis/trans isomerization under UV/visible light irradiation, making them highly promising in the field of adsorption. In this work, innovative post‐synthetic modification (PSM) approach is developed introduce azobenzene groups, resulting construction three COFs with varying degrees azo‐functionalization (ThTFB‐nN = N, n 1, 2, 3). It found that ThTFB‐nN N exhibits reversible alternating irradiation 365 and 450 nm light, degree azo content within framework, as well trans ‐ cis isomerization, can significantly influence material's properties. Notably, ‐ThTFB‐3N demonstrates highest adsorption capacity for aniline at 303.3 mg·g −1 , representing a nearly tenfold enhancement compared (30.7 ). Additionally, ThTFB‐3N shows excellent fluorescence detection capability aniline, achieving limit 22 ppb. To investigate underlying mechanisms detection, density functional theory (DFT) calculations are conducted. conclusion, work introduces novel PSM strategy incorporating photoresponsive units, leading multifunctional material substantial potential detection.

Язык: Английский

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Tailoring the structural design of covalent organic frameworks for enhanced photocatalytic carbon dioxide reduction: a review

Renewable and Sustainable Energy Reviews, Год журнала: 2025, Номер 217, С. 115754 - 115754

Опубликована: Апрель 21, 2025

Язык: Английский

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Designing covalent organic frameworks for environmental remediation: Photocatalytic strategies for water treatment

Sustainable materials and technologies, Год журнала: 2025, Номер unknown, С. e01470 - e01470

Опубликована: Май 1, 2025

Язык: Английский

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Recent advances of chiral covalent organic frameworks for enantiomer separation

Coordination Chemistry Reviews, Год журнала: 2025, Номер 542, С. 216844 - 216844

Опубликована: Июнь 4, 2025

Язык: Английский

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