Ligand engineering with heterocyclic aromatic thiol doped carbon quantum dots

Anthony, Ancy Milrad; Pandurangan, Prabhu; Abbas, Sohrab

doi:10.1016/j.carbon.2023.118086

Cited by 6 publications

(2 citation statements)

References 49 publications

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Section: Photostability Testsmentioning

confidence: 90%

“…two major contributions can be identified, at 566 nm and 625 nm, which can be associated with the formerly mentioned species. They suffered bathochromic shifts of 82 and 62 nm, respectively, proving the tunable photoluminescence properties of N-CDs [45][46][47]. The QY and fluorescence lifetime were also measured for both N-CDs, resulting in QYs of 2.3% when the synthesis lasted 2 h and 6.2% when it was left for 4 h. Fluorescence lifetimes of 2.59 ns for N-CDs and 3.04 ns for N-CDs were also observed when the reaction time was set at 2 h and when the reaction was maintained for 4 h.…”

Section: Optical Properties Of the Cdsmentioning

confidence: 92%

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One-Pot Synthesis of Green-Emitting Nitrogen-Doped Carbon Dots from Xylose

Rodríguez-Carballo,

García-Sancho,

Algarra

et al. 2023

Catalysts

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Carbon dots (CDs) are interesting carbon nanomaterials that exhibit great photoluminescent features, low cytotoxicity, and excellent water stability and solubility. For these reasons, many fields are starting to integrate their use for a variety of purposes. The catalytic performance of VOPO4 has been evaluated in the synthesis of nitrogen-doped carbon dots (N-CDs). The synthesis reaction was carried out at 180 °C using VOPO4 as a heterogeneous catalyst for 2 to 4 h of reaction time. After reaction, the N-CDs were purified using a novel method for the protection of the functional groups over the surfaces of the N-CDs. The morphological, superficial, and photoelectronic properties of the N-CDs were thoroughly studied by means of TEM, HRTEM, XPS, and photoluminescence measurements. The conversion of the carbon precursor was followed by HPLC. After three catalytic runs, the catalyst was still active while ensuring the quality of the N-CDs obtained. After the third cycle, the catalyst was regenerated, and it recovered its full activity. The obtained N-CDs showed a great degree of oxidized groups in their surfaces that translated into high photoluminescence when irradiated under different lasers. Due to the observed photoelectronic properties, they were then assayed in the photocatalytic degradation of methyl orange.

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Section: Photostability Testsmentioning

confidence: 90%

Section: Optical Properties Of the Cdsmentioning

confidence: 92%

One-Pot Synthesis of Green-Emitting Nitrogen-Doped Carbon Dots from Xylose

Rodríguez-Carballo,

García-Sancho,

Algarra

et al. 2023

Catalysts

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One-pot Microwave Synthesis of Cobalt, Nitrogen, and Sulfur Co-Doped Carbon Quantum Dots for Efficient Monosodium Glutamate Determination in Food Samples

Hamid,

Elagamy,

Gamal

et al. 2024

Food Anal. Methods

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The synthesis of cobalt, nitrogen and sulfur co doped carbon quantum dots (Co-NS-CQDs) has become a subject of significant research interest. These CQDs were produced using a single-step microwave method, which is considered environmentally friendly, and the entire process was completed in just 90 seconds. In this synthesis, citric acid was utilized as the carbon source, methionine served as the source for both nitrogen and sulfur, and cobaltous acetate was used to introduce cobalt ions into the CQDs structure. The synthesized carbon quantum dots (CQDs) exhibit a narrow size distribution and a high quantum yield of 51.5%, which is notably superior to non-metal-doped CQDs with a yield of 38%. Characterization of these CQDs was performed using different techniques such as transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier transformation infrared spectroscopy (FTIR), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The developed CQDs have blue luminescence at emission wavelength 438 nm after excitation at 350 nm. Different factors affecting the CQDs synthesis including dialysis duration, reaction time and reaction temperature. These CQDs were utilized as a probe for the detection of monosodium glutamate (MSG) in various food products. The intensity of the fluorescence of the CQDs showed a direct and linear increase with the concentration of MSG within the range of 25–250 µg/mL. The detection and quantitation limits for MSG were 2.78 µg/mL and 8.44 µg/mL, respectively. Additionally, the developed method is environmentally friendly, as confirmed by assessments using the analytical Eco scale, Green Analytical Procedure Index (GAPI), and Analytical Greenness calculator (Agree). The proposed method presents several advantages over other reported methods in terms of convenience, rapid response, and attainment of accurate and precise results.

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