Synthesis of a novel nitrogen-doped carbon dot by microwave-assisted carbonization method and its applications as selective probes for optical pH (acidity) sensing in aqueous/nonaqueous media, determination of nitrate/nitrite, and optical recognition of NOX gas

Doroodmand, Mohammad Mahdi; Askari, Mohsen

doi:10.1016/j.aca.2017.02.041

Cited by 32 publications

(8 citation statements)

References 29 publications

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“…The method adopted in this work gives linear results and detection limits similar to the other methods used, as reported in literature, although those methods are more complex and require special reagents and instruments [ 16 , 40 ]. Doroodmand has determined the use of N-CQDs to detect nitrite, but was unable to directly distinguish between nitrite and nitrate [ 31 ]. In this paper, the method directly uses N-CQDs to detect nitrite, indicating the simplicity, rapid and selective performance of the method.…”

Section: Resultsmentioning

confidence: 99%

“…Lin et al, developed an injection method for its detection, however, this requires special pumps and added hydrogen peroxide reagents [ 16 ]. Nitrogen-doped carbon quantum dots (N-CQDs) were prepared via carbonization of citric acid in the presence of triethylenetetramine as a nitrogen source, and were introduced as a novel fluorescence probe to determine NO 3 − and NO 2 − via their quenching behavior [ 31 ]. However, due to poor specificity, the method could not directly distinguish between NO 2 − and NO 3 − In the present work, N-CQDs have been applied for building a direct, fast and simpler nitrite detection method.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite

Feng

Zhang

et al. 2017

Molecules

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Nitrites are the upstream precursors of the carcinogenic nitrosamines, which are widely found in the natural environment and many food products. It is important to develop a simple and sensitive sensor for detecting nitrites. In this work, a fluorescence probe based on nitrogen-doped carbon quantum dots (N-CQDs) was developed for the sensitive and selective determination of nitrites. At pH 2, the fluorescence of N-CQDs can be selectively quenched by nitrite due to the fact N-nitroso compounds can be formed in the reaction of amide groups with nitrous acid, which results in fluorescence static quenching. Under optimal conditions, fluorescence intensity quenching upon addition of nitrite gives a satisfactory linear relationship covering the linear range of 0.2–20 μM, and the limit of detection (LOD) is 40 nM. Moreover, this method has been successfully applied to the determination of nitrites in tap water, which indicates its great potential for monitoring of nitrites in environmental samples.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite

Feng

Zhang

et al. 2017

Molecules

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“…Also, luminescence quenching from nitrite was reported. 848 Carbon dots are usually smaller (⌀ = 2−8 nm) than other types of nanosensors and show a broader dynamic wavelengths, compared to carbon dots. GODs show strong cross-talk to ionic strength, fluorescence decreases by about 30% upon addition of 50 mM NaCl to pH 4 buffer.…”

Section: Quantum Dotsmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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“…Any fluorescence changes such as wavelength, intensity, anisotropy, or lifetime related to the concentration of distinct analytes have the potential to be employed as sensors, theoretically. [ 64 ]…”

Section: Carbon Dots In Sensing Of Contaminantsmentioning

confidence: 99%

“…[ 7 ] In another study nitrite ions were detected by photoluminescence quenching of nitrogen doped CDs due to formation of azo dye (diazotization mechanism) in acidic pH. [ 64 ] In yet another study, formation of N‐nitroso compound resulted in photoluminescence quenching as a result of reaction between amide group of CDs and nitrous acid. [ 24 ] Thus, doping of CDs with nitrogen and surface functionalization of CDs with amide group was shown to be critical for selectivity of nitrite detection.…”

Section: Carbon Dots In Sensing Of Contaminantsmentioning

confidence: 99%

Carbon Dots: An Excellent Fluorescent Probe for Contaminant Sensing and Remediation

Ajith

Pardhiya

Paulraj

2022

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Synthesis of a novel nitrogen-doped carbon dot by microwave-assisted carbonization method and its applications as selective probes for optical pH (acidity) sensing in aqueous/nonaqueous media, determination of nitrate/nitrite, and optical recognition of NOX gas

Cited by 32 publications

References 29 publications

Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite

Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Carbon Dots: An Excellent Fluorescent Probe for Contaminant Sensing and Remediation

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