Carbon dots for epoxy curing: Anti-forgery patterns with long-term luminescent stability

Lee, Unhan; Heo, Eunseo; Le, Tai; Lee, Haney; Kim, Semin; Lee, Sanghyuck; Jo, Hyemi; Yoon, Hyeonseok

doi:10.1016/j.cej.2020.126988

Cited by 31 publications

(15 citation statements)

References 45 publications

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“…In addition, CDs greatly limit their application due to their notorious AIQ effect . Dispersing CDs in epoxy resins can better extend the service life of CDs while weakening the AIQ effect. , The second layer of composite membrane consists of acrylate and BaSO 4 . In the study of UV-blocking materials, TiO 2 (3.2 eV) is the most commonly used, − and we chose BaSO 4 (∼6 eV) with a higher electronic band gap to reduce the absorption of UV radiation by the membrane.…”

Section: Resultsmentioning

confidence: 99%

Recyclable, UV-Blocking, and Radiative Cooling Multifunctional Composite Membranes

et al. 2022

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It is well known that UV radiation can cause human health problems and that energy consumption can lead to human survival problems. Here, we prepared a composite membrane that can block UV radiation as well as reduce energy consumption. Carbon dots (CDs) and acrylates were prepared from xylose and epoxidized soybean oil as biomass feedstocks, respectively, and the composite membrane was prepared by a self-assembly strategy. The first layer of the membrane is composed of CDs and epoxy resin. Its main function is not only to weaken UV rays and the aggregation-induced quenching effect of CDs but also to reduce the absorption of UV rays by the second layer of the membrane. The second layer consists of barium sulfate (BaSO 4 ) and acrylate. Compared to TiO 2 (3.2 eV), BaSO 4 (∼6 eV) has a higher electronic band gap, which reduces the absorption of UV light by the membrane. The composite membrane exhibits excellent UV-blocking and radiative cooling performance, shielding 99% of UV rays. In addition, the membrane can reduce 4.4 °C in radiative cooling tests, achieving a good cooling effect. Finally, the recyclability of the BaSO 4 /acrylate membrane is discussed, and 95% recovery rate provides sustainable utilization of the membrane. The composite membrane is expected to be popularized and used in low latitudes and areas with high temperature and high UV radiation near the equator.

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Section: Resultsmentioning

confidence: 99%

Recyclable, UV-Blocking, and Radiative Cooling Multifunctional Composite Membranes

et al. 2022

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“…Otherwise, the preparation of carbon dots has the advantages of low cost, mass production, and simple operation, especially with green synthesis. The functionality of CDs depends on the nature of the precursors [ 15 ]. Therefore, it is necessary to turn MNQ into MNQ-based CDs.…”

Section: Introductionmentioning

confidence: 99%

Transcriptomics Integrated with Metabolomics Reveals 2-Methoxy-1, 4-Naphthoquinone-Based Carbon Dots Induced Molecular Shifts in Penicillium italicum

Chen

et al. 2022

JoF

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Penicillium italicum (P. italicum), a citrus blue mold, is a pathogenic fungus that greatly affects the postharvest quality of citrus fruits with significant economic loss. Our previous research showed that 2-methoxy-1, 4-naphthoquinone (MNQ) inhibited the growth of Penicillium italicum. However, the water dispersibility of MNQ will limit its further application. Herein, we synthesized MNQ-based carbon dots (2−CDs) with better water dispersibility, which showed a potential inhibitory effect on P. italicum (MIC = 2.8 μg/mL) better than that of MNQ (MIC = 5.0 μg/mL). Transcriptomics integrated with metabolomics reveals a total of 601 differentially enriched genes and 270 differentially accumulated metabolites that are co-mapped as disruptive activity on the cell cytoskeleton, glycolysis, and histone methylation. Furthermore, transmission electron microscopy analysis showed normal appearances and intracellular septum of P. italicum after treatment. These findings contribute tofurther understanding of the possible molecular action of 2−CDs.

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“…Fluorescent nanoprobes are widely used in the fields of analysis, detection, and cell imaging due to their high selectivity, high sensitivity, easy use, rapid detection, and other advantages. CDs can be directly used as nanoprobes to detect various ions such as Hg 2+ , Fe 3+ , − and H + . For example, Zhao et al synthesized CDs with two strong photoluminescence (PL) peaks at 678 and 470 under 406 nm single excitation.…”

Section: Introductionmentioning

confidence: 99%

“…The limit of detection and corresponding linear range are 0.68 and 2.29–200 μmol/L, respectively . Shang et al used basic fuchsin and citric acid to prepare CD-based fluorescent probes and applied them to the detection of intracellular pH . CD nanoprobes are also used to detect organic molecules such as caffeine, melamine, organophosphorus pesticide, and tartar yellow. − Wang et al prepared blue, green, and yellow CDs from l -cysteine and lactic acid by a one-step reflux method.…”

Section: Introductionmentioning

confidence: 99%

“…CDs can be directly used as nanoprobes to detect various ions such as Hg 2+ , 15 Fe 3+ , 16−21 and H + . 22 For example, Zhao et al synthesized CDs with two strong photoluminescence (PL) peaks at 678 and 470 under 406 nm single excitation. Increasing the concentration of Hg 2+ can weaken the emission intensity only at 678 nm, which can be used to detect Hg 2+ .…”

Section: Introductionmentioning

confidence: 99%

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Polychromatic Carbon Dots Prepared from m-Phenylenediamine and Urea as Multifunctional Fluorescent Probes

Arkin

Zheng

Hao

et al. 2021

ACS Appl. Nano Mater.

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The use of nanomaterials such as carbon dots (CDs) as rapid detection fluorescent nanoprobes is a hot topic in the field of analytical chemistry. In this paper, blue, green, and red CDs with high fluorescence quantum yields (24, 54, and 38%, respectively) were obtained from m-phenylenediamine and urea by hydrothermal synthesis and chromatographic separation. After investigating the structures and properties of the obtained CDs, three distinct and sensitive fluorescent nanoprobes with different functions were successfully constructed. The first nanoprobe derived from blue CDs could be used to detect the pH of a strong acid solution (pH 3.0); a rapid detection kit was designed based on it. The second nanoprobe based on Green CDs with ellagic acid (EA) modification allowed the sensitive determination of Fe3+ ions in aqueous solutions. The final probe derived from Red CDs could be used to test for organic acids in liquor. The test results of the commercial liquor were consistent with the standard methods. The detection mechanism of the three fluorescent probes was proposed. Using CDs to construct multifunctional fluorescent nanoprobes is beneficial for the application of CDs to rapid and specific detection and recognition.

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Carbon dots for epoxy curing: Anti-forgery patterns with long-term luminescent stability

Cited by 31 publications

References 45 publications

Recyclable, UV-Blocking, and Radiative Cooling Multifunctional Composite Membranes

Recyclable, UV-Blocking, and Radiative Cooling Multifunctional Composite Membranes

Transcriptomics Integrated with Metabolomics Reveals 2-Methoxy-1, 4-Naphthoquinone-Based Carbon Dots Induced Molecular Shifts in Penicillium italicum

Polychromatic Carbon Dots Prepared from m-Phenylenediamine and Urea as Multifunctional Fluorescent Probes

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