Microwave-assisted synthesis of N-doped carbon quantum dots for detection of methyl orange in saffron

Mir, Tahir ul Gani; Shukla, Saurabh; Malik, Azad Qayoom; Singh, Jaskaran; Kumar, Deepak

doi:10.1007/s11696-023-02726-2

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…Rapid determination of food safety and quality is vital for the food industry and the health of consumers, and the forensic lab often receives samples to determine the quality or presence of contamination [ [180] , [181] , [182] ]. For ameliorating the risks of food-borne disease outbreaks, stringent real-time monitoring of food products throughout the food supply chain is necessary [ 183 ].…”

Section: Biosensors For Food Forensicsmentioning

confidence: 99%

Advancing biological investigations using portable sensors for detection of sensitive samples

Mir,

Wani,

Akhtar

et al. 2023

Heliyon

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Section: Biosensors For Food Forensicsmentioning

confidence: 99%

Advancing biological investigations using portable sensors for detection of sensitive samples

Mir,

Wani,

Akhtar

et al. 2023

Heliyon

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“…For the past few years, carbon quantum dots (CDs), as a novel type of nanomaterial, have received much attention because of their advantages of low toxicity, strong fluorescence, good biocompatibility, and a simple preparation process. , CDs have been widely used in biomedicine, ultrasonic capacitors, chemical biosensors, photocatalysis, and other aspects of our lives. , CDs can also be employed as fluorescent probes due to their exceptional fluorescence nature, good light stability, stable fluorescence emission, and ion recognition functions. , For example, CDs have been used to detect Fe 3+ , Hg 2+ , Pd 2+ , methyl orange in saffron, and picric acid in industrial wastewater. − CDs have also been employed for the detection of ClO – . For example, Yan et al studied a CD surface modified with fluorescein derivatives, which detects ClO – in the linear range of 0–70 μM by the energy transfer principle .…”

Section: Introductionmentioning

confidence: 99%

Carbon Quantum Dots for Rapid and Ratiometric Fluorescence Determination of Hypochlorite

Shao,

Guo,

Zhong

et al. 2024

ACS Appl. Nano Mater.

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Herein, we present a method for rapid ratiometric fluorescence detection of hypochlorite (ClO − ) by carbon quantum dots (CDs). Glutathione (GSH) was utilized as the starting material for the synthesis of CDs through a hydrothermal process. A maximum fluorescence intensity at an emission wavelength of 435 nm was observed under an excitation wavelength of 335 nm. The inner filter effect (IFE) of curcumin (CCM) on CDs could be utilized to reduce the fluorescence intensity of CDs at 435 nm, while an emission peak emerged at 540 nm. ClO − could rapidly oxidize CCM due to its oxidizing properties, which weakened the IFE, leading to a decrease in the fluorescence intensity of CCM at 540 nm, while the fluorescence intensity of CDs at 435 nm is restored. In addition, CDs exhibited excellent selectivity and sensitivity in the fluorescence detection of ClO − , and a substantial sensitivity in the detection of ClO − was established within a concentration range of 1−1500 μM with a limit of detection of 36.54 nM. The spiked recovery tests of tap water, swimming pool water, and milk samples showed the feasibility of using CDs for the ratiometric fluorescence detection of ClO − in real samples.

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“…The “top‐down” approach uses carbon‐rich materials such as coal and graphite as carbon sources and is prepared by electric arc discharge, 1 ultrasonic synthesis, 2,3 chemical oxidation, 4,5 electro‐chemical oxidation, 6,7 and laser ablation 8,9 . The ‘bottom‐up’ method is prepared by hydrothermal treatment, 10 thermal decomposition, 8,11 microwave synthesis, 12,13 using organic minor macromolecules, such as glucose and citric acid as carbon sources. In recent years, carbon quantum dots have been extensively applied in the field of photocatalysis, 14 chemical and biological sensing fields, 15,16 bioimaging, 17 biomedical materials, 18 and ion detection 19 …”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of S‐doped coal‐based carbon quantum dots and its application to Cr⁶⁺ detection

Zhang

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDCoal‐based carbon quantum dots have better stability compared with other carbon quantum dots prepared from small molecules as carbon sources. Elemental doping can effectively improve the fluorescence performance of carbon quantum dots. However, the electronegativity difference between sulfur and carbon is small and the charge transfer between the two is very weak, so it is very difficult to dope sulfur onto carbon quantum dots by chemical methods. High sulfur content coal can achieve in situ synthesis of sulfur‐containing carbon quantum dots.RESULTSThe results showed that the prepared quantum dots had good stability and which increased with the increase of coal rank. CQDS is well dispersed, with an average particle size between 2.44 and 2.74 nm. It can emit light blue fluorescence under the UV excitation of 365 nm. It was found that trace amount of Cr6+ had a fluorescence quenching effect on CQDS and a good linear relationship was observed in the range of 0–100 μmol·L−1.CONCLUSIONQuantum dots doped with S atoms have better selectivity, interference resistance, and sensitivity in the detection of metal ions. The stability and the particle size of CQDS are increased with the coal rank. The quantum yield of CQDS prepared from high sulfur content coal is higher than low sulfur content coal which has same rank. The addition of Cr6+ to CQDS produces a dynamic fluorescence quenching. This study provides a new idea for the green preparation of coal‐based carbon quantum dots and the ion detection. © 2023 Society of Chemical Industry.

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Microwave-assisted synthesis of N-doped carbon quantum dots for detection of methyl orange in saffron

Cited by 9 publications

References 45 publications

Advancing biological investigations using portable sensors for detection of sensitive samples

Advancing biological investigations using portable sensors for detection of sensitive samples

Carbon Quantum Dots for Rapid and Ratiometric Fluorescence Determination of Hypochlorite

In situ synthesis of S‐doped coal‐based carbon quantum dots and its application to Cr⁶⁺ detection

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Microwave-assisted synthesis of N-doped carbon quantum dots for detection of methyl orange in saffron

Cited by 9 publications

References 45 publications

Advancing biological investigations using portable sensors for detection of sensitive samples

Advancing biological investigations using portable sensors for detection of sensitive samples

Carbon Quantum Dots for Rapid and Ratiometric Fluorescence Determination of Hypochlorite

In situ synthesis of S‐doped coal‐based carbon quantum dots and its application to Cr6+ detection

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In situ synthesis of S‐doped coal‐based carbon quantum dots and its application to Cr⁶⁺ detection