Ultrabright Fluorescent Polymeric Nanofibers and Coatings Based on Ionic Dye Insulation with Bulky Counterions

Ashoka, Anila Hoskere; Klymchenko, Andrey S.

doi:10.1021/acsami.1c06436

Cited by 29 publications

(7 citation statements)

References 63 publications

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“…We expect that our BHS approach could be extended to other LHA materials based on ionic dyes, which could include rhodamines [32,36] and cyanines, [55] SMILES approach [67,68] and ionic AIE dyes [48] as well as to dye-loaded materials of higher dimensionality, such as polymeric nanofibers and thin films. [82] Moreover, the achieved boost in the performance of light-harvesting nanoantennas opens the way to detection of single molecules using portable user-friendly devices.…”

Section: Discussionmentioning

confidence: 99%

Giant Light‐Harvesting in Dye‐Loaded Nanoparticles Enhanced by Blank Hydrophobic Salts

Biswas,

Melnychuk,

Severi

et al. 2023

Advanced Optical Materials

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Light‐harvesting is a fundamental process in nature, which inspires researchers to develop artificial systems for photocatalysis, photovoltaics, and biosensing. A previously introduced light‐harvesting nanoantenna, based on polymeric nanoparticles (NPs) loaded with rhodamine dyes and bulky hydrophobic counterions, provides a record‐breaking antenna effect ≈1000. However, the high dye cooperativity of its thousands of encapsulated dyes causes energy losses by traces of self‐quenched dye aggregates. Here, it is found that these imperfections can be suppressed by blank hydrophobic salts (BHS) formed by the same bulky counterion (fluorinated tetraphenylborate) with an optically inactive cation, analogs of ionic liquids. The presence of BHS increases twofold the fluorescence quantum yields and fluorescence lifetimes of NPs and suppresses their fluorescence blinking. This study assumes that BHS provides an excess of bulky counterions that excludes traces of dye aggregates. As a result, an efficient Forster resonance energy transfer (FRET) is achieved from 40 000 dye donors to a single acceptor within a 70 nm particle, leading to the antenna effect of 4800, which is by far the highest value reported to date. Using this nanoantenna, a single‐molecule detection of the FRET acceptor is realized at low excitation power using an RGB camera of a smartphone.

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Section: Discussionmentioning

confidence: 99%

Giant Light‐Harvesting in Dye‐Loaded Nanoparticles Enhanced by Blank Hydrophobic Salts

Biswas,

Melnychuk,

Severi

et al. 2023

Advanced Optical Materials

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“…Magnetoresponsive materials, especially in combination with fluorescence, display applications ranging from magnetic resonance imaging, to cell labelling and tracking. [45] The fluorescence activity of such materials is commonly attained by adding fluorescent lanthanide complexes [46,47] or fluorescent organic molecules [48,49] to magnetic materials. Additional magnetic functions can be introduced e. g., by incorporating Fe 3 O 4 nanoparticles into a polymer matrix.…”

Section: Magnetic and Fluorescent Fibersmentioning

confidence: 99%

Polymeric Janus Fibers

2023

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Janus fibers are a class of composite materials comprising mechanical and chemical to biological functionality. Combining different materials and functionalities in one micro-or even nanoscale fiber enables otherwise unreachable synergistic physicochemical effects with unprecedented opportunities for technical or biomedical applications. Here, recent developments of processing technologies and applications of polymeric Janus fibers will be reviewed. Various examples in the fields of textiles, catalysis, sensors as well as medical applications, like drug delivery systems, tissue engineering and antimicrobial materials, are presented to illuminate the outstanding potential of such high-end functional materials for novel applications in the upcoming future.

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“…[7] Photoluminescent NFs can be produced by two approaches. The most common one is based on the use of transparent or optically inert polymers that can be doped with luminescent materials (inorganic quantum dots, organic chromophores, polymers, and bio-chromophores), [8][9][10][11][12][13] and the other one is the usage of self-luminous conjugated polymers. [14,15] These materials have variability in solubility, rheological and optical properties, uniform morphology, and fluorescence properties.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Analyte Sensitive Fluorophore Cross‐Linked Nanofibers Based Antimicrobial Surface Enabling Bacterial Detection and Their Usage as Crystal Growth Template

Dikmen,

Bütün

2023

Macro Materials & Eng

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In situ preparation of bifunctional thiazolo[5,4‐d]thiazole (TTz)‐based fluorophore cross‐linked nanofibers is successfully performed. These multifunctional nanofibers are used as both crystal growth template and antibacterial substrate that makes bacterial detection possible simultaneously. These highly fluorescent nanofibers act as optical sensors toward many analytes. The acid, base, and metal cation‐sensitive nature of the 2,5‐bis(4‐hydroxyphenyl)thiazolo[5,4‐d]thiazole (HPhTT) dye makes the prepared PVA nanofibers sensitive against these chemicals. Metal nanoparticles (MNPs) or metal oxide crystal formation occurs on the surface of nanofibers without any reducing agent. The strong interaction between metal cations and fluorophores results in crystal formation on the surface, which is named for the first time as “complexation‐triggered crystalization.” These dye cross‐linked and metal‐interacted nanofibers exhibit antibacterial effect against E. coli (ATCC 25922), S. aureus (ATCC 25923), P. aeruginosa (ATCC 27853), and E. faecalis (ATCC 25922) strains. Also, the emission wavelength change of nanofibers in bacterial contamination makes it possible to use smart nanofiber films for optical bacteria detection. These novel materials pave the way for new applications such as smart wound bands, optical sensors, and one‐step preparation of surface‐enhanced Raman spectroscopy substrate.

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Ultrabright Fluorescent Polymeric Nanofibers and Coatings Based on Ionic Dye Insulation with Bulky Counterions

Cited by 29 publications

References 63 publications

Giant Light‐Harvesting in Dye‐Loaded Nanoparticles Enhanced by Blank Hydrophobic Salts

Giant Light‐Harvesting in Dye‐Loaded Nanoparticles Enhanced by Blank Hydrophobic Salts

Polymeric Janus Fibers

Multi‐Analyte Sensitive Fluorophore Cross‐Linked Nanofibers Based Antimicrobial Surface Enabling Bacterial Detection and Their Usage as Crystal Growth Template

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