Microwave-assisted green synthesis of ﬂuorescent carbon quantum dots from Mexican Mint extract for Fe3+ detection and bio-imaging applications

Architha, Natarajan; Ragupathi, Murugesan; Shobana, Chellappan; Selvankumar, Thangasamy; Kumar, Ponnuchamy; Lee, Yun‐Sung; Selvan, R. Kalai

doi:10.1016/j.envres.2021.111263

Cited by 96 publications

(35 citation statements)

References 65 publications

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“…Carbon quantum dots (CQDs) are regarded as a novel class of fluorescence nanomaterials. Meanwhile CQDs exhibit many unique advantages, compared with traditional fluorescent nanomaterials, such as excellent biocompatibility [1], good solubility [2], low toxicity [3,4], remarkable photostability [5], as well as their small size. Hence CQDs are considered as one of the most attractive alternative to traditional fluorescent materials, and have been used in drug delivery carriers [6,7], biological imaging [8,9], fluorescent probes [10,11], photovoltaic devices [12,13], and so on.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Chang

Zhu

et al. 2022

Materials

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Nitrogen-doped carbon quantum dots (N-CQDs) were synthesized in a one-step hydrothermal technique utilizing L-lactic acid as that of the source of carbon and ethylenediamine as that of the source of nitrogen, and were characterized using dynamic light scattering, X-ray photoelectron spectroscopy ultraviolet-visible spectrum, Fourier-transformed infrared spectrum, high-resolution transmission electron microscopy, and fluorescence spectrum. The generated N-CQDs have a spherical structure and overall diameters ranging from 1–4 nm, and their surface comprises specific functional groups such as amino, carboxyl, and hydroxyl, resulting in greater water solubility and fluorescence. The quantum yield of N-CQDs (being 46%) is significantly higher than that of the CQDs synthesized from other biomass in literatures. Its fluorescence intensity is dependent on the excitation wavelength, and N-CQDs release blue light at 365 nm under ultraviolet light. The pH values may impact the protonation of N-CQDs surface functional groups and lead to significant fluorescence quenching of N-CQDs. Therefore, the fluorescence intensity of N-CQDs is the highest at pH 7.0, but it decreases with pH as pH values being either more than or less than pH 7.0. The N-CQDs exhibit high sensitivity to Fe3+ ions, for Fe3+ ions would decrease the fluorescence intensity of N-CQDs by 99.6%, and the influence of Fe3+ ions on N-CQDs fluorescence quenching is slightly affected by other metal ions. Moreover, the fluorescence quenching efficiency of Fe3+ ions displays an obvious linear relationship to Fe3+ concentrations in a wide range of concentrations (up to 200 µM) and with a detection limit of 1.89 µM. Therefore, the generated N-CQDs may be utilized as a robust fluorescence sensor for detecting pH and Fe3+ ions.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Chang

Zhu

et al. 2022

Materials

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“…Microwave-assisted method for the synthesis of g-CDs by microwave carbonization of carbon sources [42] . Architha et al [43] used microwave-assisted method to synthesize blue g-CDs from mint leaves that selectively recognized Fe 3+ based on photoinduced electron transfer (PET) with a detection limit of 0.53 µm. The switching behavior of g-CDs in ascorbic acid added fluorescence was studied by constructing NOT and MPLCATION logic gates (Figure 7a).…”

Section: Microwave-assisted Methodsmentioning

confidence: 99%

Section: Synthesis Methods Of Green Carbon Dotsmentioning

confidence: 99%

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Application Progress of Green Carbon Dots in Analysis and Detection

Zuo

et al. 2022

Part & Part Syst Charact

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Green chemistry is currently attracting more and more attention due to its eco‐friendly, and green carbon dots (g‐CDs) are creating a research boom. The g‐CDs have huge application prospects in analysis and detection due to their excellent optical properties, high biocompatibility, and low toxicity compared to other fluorescent materials. Based on the study of g‐CDs, the optical properties, synthesis methods, surface modification methods, and sensing mechanisms of g‐CDs are outlined, and the application in analysis and detection of environmental, food, biomolecules, and other organic small molecules are reviewed. At the same time, the challenges faced by g‐CDs are outlined. This review provides valuable references for further research and wider application of g‐CDs.

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“… 2 Carbon sources mainly include organic chemicals (citric acid, 3 etc. ) and biomass (plants, 4 animals 5 and their derivatives 6 ). Due to the high nitrogen content, 7 low cost, and good biocompatibility of biomass, 8 more and more biomass-derived carbon dots were synthesized, such as soy milk 9 (Yu = 8.6%, Yu is the fluorescence quantum yield) and bamboo leaves 10 (Yu = 7.1%).…”

Section: Introductionmentioning

confidence: 99%

A facile green and one-pot synthesis of grape seed-derived carbon quantum dots as a fluorescence probe for Cu(ii) and ascorbic acid

Zhu

2021

RSC Adv.

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Microwave-assisted green synthesis of ﬂuorescent carbon quantum dots from Mexican Mint extract for Fe3+ detection and bio-imaging applications

Cited by 96 publications

References 65 publications

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Application Progress of Green Carbon Dots in Analysis and Detection

A facile green and one-pot synthesis of grape seed-derived carbon quantum dots as a fluorescence probe for Cu(ii) and ascorbic acid

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