Highly fluorescent N,S-co-doped carbon dots: synthesis and multiple applications

Shen, Jie; Zhang, Ting; Cai, Yan; Chen, Xiuying; Shang, Shuo; Li, Juan

doi:10.1039/c7nj00505a

Cited by 60 publications

(17 citation statements)

References 73 publications

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“…Here, because nitrogen is successfully doped into the CQDs, it could introduce a new energy level between Cπ and Cπ*, which plays a leading role in the luminescence of the CQDs. Excitation‐dependent PL has been widely observed in previously reported CQDs and is usually attributed to surface defects on the CQDs and quantum effects (size effects) . In our as‐prepared CQDs, the size of the CQDs is not very uniform; as shown in Figure b, the size distribution ranges from 2 to 6 nm.…”

Section: Resultsmentioning

confidence: 72%

Facile Synthesis of Fluorescent Nitrogen‐Doped Carbon Quantum Dots Using Scindapsus as a Carbon Source

Yang

Sun

et al. 2019

Physica Status Solidi (a)

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A green method is used to synthesize nitrogen-doped carbon quantum dots (N-CQDs) using dried scindapsus leaves as the carbon source. The average diameter of the N-CQDs varies from 2 to 6 nm. The N-CQDs emit blue light, and the emission wavelength exhibits excitation wavelength dependence. The characteristic peak is found to originate from a N-related state. The surface defects and quantum effects of the CQDs play a strong role in the luminescence process and resulted in the excitation wavelength dependence of the photoluminescence, which is confirmed by changing the solvent to ethanol. This work can encourage the exploration of new carbon sources to synthesize doped CQDs and stimulate investigation of the photoluminescence mechanism of CQDs.

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Section: Resultsmentioning

confidence: 72%

Facile Synthesis of Fluorescent Nitrogen‐Doped Carbon Quantum Dots Using Scindapsus as a Carbon Source

Yang

Sun

et al. 2019

Physica Status Solidi (a)

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“…and ABTS .+ , respectively. Regarding activity in the DPPH assay, the EHC nanomaterial was outstanding compared with carbon dots, which display scavenging activity with EC 50 values ranging from 50 to 600 μg mL −1 . To the best of our knowledge, the ability of carbon dots to scavenge ABTS radical has never been reported, making a literature comparison impossible.…”

Section: Resultsmentioning

confidence: 99%

“…The free-radical scavenging activity of the EHC nanomaterial can be described by al inear function, and the EC 50 values obtained were 18.7 and 23.2 mgmL À1 against DPPHC and ABTSC + ,r espectively.R egardinga ctivity in the DPPH assay,t he EHC nanomaterial was outstanding comparedw ith carbon dots, which display scavenging activity with EC 50 values ranging from 50 to 600 mgmL À1 . [21,22,[44][45][46][47] To the best of our knowledge,t he ability of carbon dots to scavenge ABTS radical has never been reported, making al iterature comparison impossible.…”

Section: Electrochemical Characterisationmentioning

confidence: 99%

Hydrophilic Carbon Nanomaterials: Characterisation by Physical, Chemical, and Biological Assays

et al. 2019

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A highly hydrophilic carbon nanomaterial was generated by using an electrochemical approach, and its structure, chemical composition, redox properties, antioxidant activity and effects on cells were characterised. It was found that the nanomaterial possesses a structure dominated by sp2 carbon atoms in a non‐ordered carbon network formed by small clusters (<2 nm) of a carbonaceous material. This material has an outstanding capability for donating electrons and an unusual ability to bind metal cations. Antioxidant activity assays showed that it displays a high scavenging activity against both 2,2‐diphenyl‐1‐picrylhydrazyl and 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulfonic acid) radicals, and a concentration‐dependent ability to protect mitochondrial lipids and intracellular thiol groups from oxidation promoted by external oxidising agents. Cell‐based assays also revealed that the nanomaterial has the ability to protect neuronal cells against oxidative damage and toxicity promoted by tert‐butyl hydroperoxide and amyloid‐β1–42 peptide. These results, combined with the attractive methodology for generating this hydrophilic carbon‐based nanomaterial, make this study the first step in addressing the therapeutic application of this new material.

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“…As shown in Figure (c), FTIR spectra show the existence of same functional groups but with different peak intensity in both the O‐CQDs & M–CQDs, which revealed the same chemical composition with variation of amount only. The spectra of O‐CQDs disclosed the vibrational peak at 1719 cm −1 , 1645 cm −1 , and 1106 cm −1 are assigned to C=O, C=N and C=S respectively. Besides this, the broad band at 3461 cm −1 appears for O−H and doublet of N−H exists at 3203 cm −1 and 3050 cm −1 in synthesized O‐CQDs.…”

Section: Resultsmentioning

confidence: 99%

“…In the high resolution XPS (Figure a), C 1s was deconvoluted into five different carbon states at 284.0 eV, 285.1 eV, 285.7 eV, 287.1, and 288.5 eV which were ascribed to C=C, C−S, C=N, C=S) and carboxyl carbon (COOH), respectively. As shown in Figure (b), N 1s could be further deconvoluted into two peak at 398.6 eV and 400.3 eV which were corresponding to C=N and pyrrolic N, confirmed the successful doping of N in O‐CQDs. For O 1s XPS (Figure c), O‐CQDs showed two pronounced peak at 530.7 eV and 533.2 eV for C=O and C‐O, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Longer‐Wavelength‐Emissive Carbon Quantum Dots for WLEDs and Investigation of Their Photoluminescence Properties

Kumari

Sahu

2018

ChemistrySelect

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The synthesis of highly fluorescent longer wavelength emissive carbon quantum dots (CQDs) is still a great challenge as well as an important issue, hindering its application in white light emitting diode (WLED). Herein, we have demonstrated a simple one‐pot solvothermal route for the synthesis of nitrogen and sulphur co‐doped CQDs using pyromellitic acid (PA), diethylenetriamine (DETA) and thiourea. At the specific molar ratio of the precursors, the orange color emissive CQDs (O‐CQDs) are synthesized and possess longer wavelength emission (611 nm). Additionally, O‐CQDs exhibits temperature and pH dependent photoluminescence (PL) properties. The O‐CQDs shows color correlated temperature (CCT) of 1745 K with high color purity of 98%. Simultaneously, as‐synthesized nitrogen and sulphur co‐doped CQDs shows concentration‐dependent PL properties, which display not only the brightness with stable orange color but also possess range of multicolour emission at different PL excitation. Solid host matrix of O‐CQDs is fabricated with poly‐(methyl methacrylate) (PMMA) chloroform solution and orange emissive property is investigated by wrapping the film over LED (InGaN) bulb. These studies will open up new opportunities to explore the tunable optical properties of carbon quantum dots and its applications in WLED devices.

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Highly fluorescent N,S-co-doped carbon dots: synthesis and multiple applications

Abstract: N and S co-doped carbon dots (N,S-CDs) synthesized from biomass can be used as multicolor probes for cell imaging. The N,S-CDs can selectively and sensitively detect Cr(vi) in real lake water, human serum and living cells.

Cited by 60 publications

References 73 publications

Facile Synthesis of Fluorescent Nitrogen‐Doped Carbon Quantum Dots Using Scindapsus as a Carbon Source

Facile Synthesis of Fluorescent Nitrogen‐Doped Carbon Quantum Dots Using Scindapsus as a Carbon Source

Hydrophilic Carbon Nanomaterials: Characterisation by Physical, Chemical, and Biological Assays

Synthesis of Longer‐Wavelength‐Emissive Carbon Quantum Dots for WLEDs and Investigation of Their Photoluminescence Properties

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