Microwave-assisted hydrothermal synthesis of UV-emitting carbon dots from tannic acid

Joseph, Julin; Anappara, Aji A.

doi:10.1039/c6nj02107g

Cited by 41 publications

(10 citation statements)

References 61 publications

(112 reference statements)

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“…The lifetimes had almost no change in the presence of MnO 4 − , which indicated that the static quenching effect (SQE) was formed between N/P CDs and MnO 4 − . In the RET process, target molecules can significantly change the fluorescence lifetime of the fluorophore ( Joseph and Anappara, 2016 ; Liu et al, 2016 ; Sun et al, 2016 ; Li et al, 2018 ). Thus, RET was not the main reason to induce the fluorescence quenching.…”

Section: Resultsmentioning

confidence: 99%

Highly Luminescent Nucleoside-Based N, P-Doped Carbon Dots for Sensitive Detection of Ions and Bioimaging

et al. 2022

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The efficient detection of Fe3+ and MnO4− in a water environment is very important and challenging due to their harmful effects on the health of humanity and environmental systems. Good biocompatibility, sensitivity, selectivity, and superior photophysical properties were important attributes of carbon dot-based CDs sensors for sensing applications. In this work, we synthesized N, P-co-doped carbon dots (N/P CDs) with guanosine 5′-monophosphate (GMP) as a green carbon source, with high fluorescence quantum yield in water (QY, 53.72%). First, the luminescent N/P CDs showed a three-state “on-off-on” fluorescence response upon the sequential addition of Fe3+ and F−, with a low detection limit of 12 nM for Fe3+ and 8.5 nM for F−, respectively. Second, the N/P CDs also exhibited desirable selectivity and sensitivity for toxic MnO4− detection with the limit of detection of 18.2 nM, through a turn-off mechanism. Moreover, the luminescent N/P CDs successfully monitored the aforementioned ions in environmental water samples and in Escherichia coli.

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Section: Resultsmentioning

confidence: 99%

Highly Luminescent Nucleoside-Based N, P-Doped Carbon Dots for Sensitive Detection of Ions and Bioimaging

et al. 2022

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“…The high-resolution O 1s spectra are shown in Figure 6 c,g,k,o. The two fitted peaks at 531.3 and 532.4 eV are ascribed to C=O and C–O groups [ 74 , 75 ], respectively. The existence of C–O and C=O bonds indicated that the surface of the as-synthesized CQDs is functionalized by multiple oxygenated groups, which is consistent with C1s spectra.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Blue-Green Double Emissions in Carbon Quantum Dots via Co-Doping Engineering by Competition Mechanism between Chlorine-Related States and Conjugated π-Domains

et al. 2018

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Representing single-layer to tens of layers of graphene in a size less than 30 nm, carbon quantum dots (CQDs) is becoming an advanced multifunctional material for its unique optical, electronic, spin and photoelectric properties induced by the quantum confinement effect and edge effect. In present work, upon co-doping engineering, nitrogen and chlorine co-doped CQDs with uniquely strong blue-green double emissions are developed via a facile and one-pot hydrothermal method. The crystalline and optical properties of CQDs have been well manipulated by tuning the mole ratio of nitrogen/chlorine and the reaction time. The characteristic green emission centered at 512 nm has been verified, originating from the chlorine-related states, the other blue emissions centered at 460 nm are attributed to the conjugated π-domain. Increasing the proportion of 1,2,4-benzentriamine dihydrochloride can effectively adjust the bandgap of CQDs, mainly caused by the synergy and competition of chlorine-related states and the conjugated π-domain. Prolonging the reaction time promotes more nitrogen and chlorine dopants incorporate into CQDs, which inhibits the growth of CQDs to reduce the average size of CQDs down to 1.5 nm, so that the quantum confinement effect dominates into play. This work not only provides a candidate with excellent optical properties for heteroatoms-doped carbon materials but also benefits to stimulate the intensive studies for co-doped carbon with chlorine as one of new dopants paradigm.

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“…As the optoelectronic properties of CDs are strongly dependent on emissive sites of the surface functional groups, unlike other fluorophores, carbon dots exhibit excitation wavelength‐dependent emission. Although excitation‐wavelength dependent/independent fluorescence emission at different spectral ranges was realized with CDs, reports regarding phosphorescence from CDs are rather rare …”

Section: Figurementioning

confidence: 99%

Long Life-time Room-temperature Phosphorescence of Carbon Dots in Aluminum Sulfate

Joseph

Anappara

2017

ChemistrySelect

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Herein we report the observation of room-temperature phosphorescence from carbon dots (CDs) embedded in aluminium sulfate. Phosphorescence emission in CDs was achieved by incorporating C=O/C=N functionalities on the carbon dots (CDs) in a single-step reaction. Benzene-1, 3, 5-tricarboxylic acid and formamide were used as precursors, and the resulting CDs in aqueous dispersion show excellent fluorescence in the blue region with quantum yield about 42.7%. On embedding CDs in aluminum sulfate, a green after-glow, with phosphorescence life-time of~876 ms was observed. The 1931 CIE color parameters corresponding to the phosphorescence emission (0.26, 0.36) indicated that the emission is in the white-gamut region of the chromaticity diagram.[a] J.

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Microwave-assisted hydrothermal synthesis of UV-emitting carbon dots from tannic acid

Abstract: UV-photoluminescent carbon dots were synthesized through a facile process and were used as fluorophores for the highly selective and sensitive detection of picric acid.

Cited by 41 publications

References 61 publications

Highly Luminescent Nucleoside-Based N, P-Doped Carbon Dots for Sensitive Detection of Ions and Bioimaging

Highly Luminescent Nucleoside-Based N, P-Doped Carbon Dots for Sensitive Detection of Ions and Bioimaging

Tailoring Blue-Green Double Emissions in Carbon Quantum Dots via Co-Doping Engineering by Competition Mechanism between Chlorine-Related States and Conjugated π-Domains

Long Life-time Room-temperature Phosphorescence of Carbon Dots in Aluminum Sulfate

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