Strong visible-light emission in annealed poly(acrylic acid)

Tarekegne, Abebe Tilahun; Janting, Jakob; Ou, Haiyan

doi:10.1364/ome.411329

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…Similarly, the observable bands at 1620 cm −1 were assigned to C=O aromatic vibrations. These results confirm FTIR data reported by Tarekegne et al [ 49 ], where the peak at the same range with our observable value was attributed to symmetric C=O stretch. There is no major difference in the embedded functional groups of the biomolecules when considering the biosynthesis of AgNPs using temperature variation.…”

Section: Discussionsupporting

confidence: 93%

Green Synthesis of Silver Nanoparticles from Diospyros villosa Extracts and Evaluation of Antioxidant, Antimicrobial and Anti-Quorum Sensing Potential

Adu

Mohamed

Naidoo

et al. 2022

Plants

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The biosynthesis of silver nanoparticles (AgNPs) from Diospyros villosa leaves and stem bark extracts is described. The stem bark AgNPs of D. villosa synthesized at 80 °C (S80) showed good scavenging activity with a lower IC50 value of 8.75 µg·mL−1 compared to ascorbic acid (9.58 µg·mL−1). The total phenol content of the S80 AgNPs was measured and found to be 10.22 ± 0.14 mg.g−1 gallic acid equivalence (GAE). Bacterial growth inhibition (% GI) and violacein inhibition (% VI) of 10.08% and 58.83%, respectively, was observed against C.subtsugae CV017 with leaf AgNPs synthesized at 80 °C (L80) at 80 μg·mL−1. Stem bark AgNPs synthesized at room temperature (SRT) also indicated % GI of 13.83% and % VI of 65.97% against C. subtsugae CV017 at 160 μg·mL−1. Leaf AgNPs of D. villosa synthesized at room temperature (LRT), showed % GI of 29.07% and % VI of 56.53%, respectively, against C. violaceum ATCC 12472 at 320 μg·mL−1. The L80 and SRT at 160 μg·mL−1 and LRT at 320 μg·mL−1 may be considered as potential QS inhibitors following their activity against C. subtsugae CV017 and C. violaceum ATCC 12472, respectively. Therefore, D. villosa represents a potential source of antioxidants as well as an anti-quorum sensing therapeutic candidate for the control of Gram-negative bacterial infections.

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Section: Discussionsupporting

confidence: 93%

Green Synthesis of Silver Nanoparticles from Diospyros villosa Extracts and Evaluation of Antioxidant, Antimicrobial and Anti-Quorum Sensing Potential

Adu

Mohamed

Naidoo

et al. 2022

Plants

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“…Ou's group reported the red-shifted emission of poly(acrylic acid) (PAA) by annealing. [87] As the annealing temperature increases from 200 to 400 °C, the emission wavelength red-shifts from 439 to 562 nm. Increasing the annealing duration can also shift the emission to longer wavelengths.…”

Section: Oxidation and Hydrothermal Treatment Of Nontraditional Lumin...mentioning

confidence: 99%

Nontraditional Organic/Polymeric Luminogens with Red‐Shifted Fluorescence Emissions

Deng

Jia

Xie

et al. 2022

Macro Chemistry & Physics

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Nontraditional organic/polymeric luminogens, which do not contain any conventional chromophores like large 𝝅-conjugated benzene rings and/or heterocycles, have attracted rapidly growing attention owing to their importance in the fundamental understanding of photoluminescence mechanisms and potential practical applications. However, compared to traditional luminogens, most nontraditional luminogens (NTLs) emit fluorescence in the blue region, and only very limited NTLs with green, yellow, and red emissions have been reported. It is of great scientific and practical importance to develop NTLs with red-shifted emissions and understand their mechanisms. This review first provides a brief overview of the types of NTLs based on heteroatoms in them, the luminescence mechanism and luminescent characteristics of NTLs, then summarizes recent progress in NTLs with red-shifted emissions and the main strategies employed, i.e., introducing multiple nonconventional chromophores, introducing intra-/intermolecular interactions to rigidify clusters, and introducing electron-giving/withdrawing groups into molecules to lower the gap between the HOMO-LUMO energy levels. This review also provides the perspectives and outlook on future development of NTLs with red-shifted emissions.

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“…Based on these advantages, nonconjugated luminescent materials have enormous application prospects in the fields of sensors, biology, and medicine [5–8] . Over the past few decades, numerous luminescent materials with nontraditional chromophores, such as N, O, S, and P heteroatoms, or unsaturated bonds, have been reported [9–29] . However, these materials usually exhibit absorption in the ultraviolet band and emissions in the blue and green regions, which severely impedes their practical applications, especially in biological and medical fields, because blue and green excitation/emission can damage biological samples and it is difficult to penetrate deeply into tissues [30,31] .…”

Section: Introductionmentioning

confidence: 99%

Self‐Catalyzed Hydroxyl‐Yne Click Reaction: A Powerful Tool toward Red‐Emitting Nontraditional Small Organic Luminogens

et al. 2023

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Nontraditional small organic luminogens (NTSOLs) without classic conjugated chromophores have attracted significant attention. However, the design and synthesis of NTSOLs with fluorescence in the red region remain significantly challenging. In this study, we established a self‐catalyzed hydroxyl‐yne click reaction for preparing long‐wavelength and red‐emitting NTSOLs. Owing to their perfect reaction selectivity, high efficiency, and excellent universality, a series of compounds with well‐defined structures were obtained in high yields. Moreover, the obtained compounds showed concentration‐enhanced and excitation‐dependent emission characteristics. The compounds also exhibited dramatical chemical structure‐dependent and aggregation‐induced red‐shifted fluorescence properties, based on which we successfully obtained red‐emitting NTSOLs by simply adjusting chemical structure and concentration. Also, the compounds show good cell staining ability, which can be used in cell imaging.

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Strong visible-light emission in annealed poly(acrylic acid)

Cited by 8 publications

References 32 publications

Green Synthesis of Silver Nanoparticles from Diospyros villosa Extracts and Evaluation of Antioxidant, Antimicrobial and Anti-Quorum Sensing Potential

Green Synthesis of Silver Nanoparticles from Diospyros villosa Extracts and Evaluation of Antioxidant, Antimicrobial and Anti-Quorum Sensing Potential

Nontraditional Organic/Polymeric Luminogens with Red‐Shifted Fluorescence Emissions

Self‐Catalyzed Hydroxyl‐Yne Click Reaction: A Powerful Tool toward Red‐Emitting Nontraditional Small Organic Luminogens

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