Nitrogen doped carbon dots: mechanism investigation and their application for label free CA125 analysis

Liu, Yuanyuan; Jiang, Liping; Li, Bijun; Fan, Xinyue; Wang, Wei; Li, Pingping; Xu, Shenghao; Liu, Xiang

doi:10.1039/c9tb00021f

Cited by 71 publications

(30 citation statements)

References 32 publications

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“…Element doping, e.g., N-doping or dual element doping, can enhance the photocatalytic and luminescent properties of CDs. Nitrogen-doped CDs (N-CDs) exhibit improved photocatalytic activity, as the nitrogen atom has a size that is similar to that of the carbon atom and effectively binds with the latter atoms via five valence electrons [52,53]. Among the photocatalytic applications of N-CDs, one should note those that are related to water treatment and the degradation of organic acids and synthetic dyes [54,55].…”

Section: Modification Of Cds For Photocatalysismentioning

confidence: 99%

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

et al. 2020

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The tunable photoluminescent and photocatalytic properties of carbon dots (CDs) via chemical surface modification have drawn increased attention to this emerging class of carbon nanomaterials. Herein, we summarize the advances in CD synthesis and modification, with a focus on surface functionalization, element doping, passivation, and nanocomposite formation with metal oxides, transition metal chalcogenides, or graphitic carbon nitrides. The effects of CD size and functionalization on photocatalytic properties are discussed, along with the photocatalytic applications of CDs in energy conversion, water splitting, hydrogen evolution, water treatment, and chemical degradation. In particular, the enzyme-mimetic and photodynamic applications of CDs for bio-related uses are thoroughly reviewed.

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Section: Modification Of Cds For Photocatalysismentioning

confidence: 99%

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

et al. 2020

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“…Further, nitrogen offers five valence electrons for bonding with carbon atoms [3]. More importantly, N-doping generally enhances the fluorescence quantum yield (QY FL ) of the CDs [27][28][29], which has made N-doping one of the main strategies for enhancing the photoluminescence of CDs [3,30,31]. N-doping is generally achieved by adding a nitrogen-rich small organic molecule as a nitrogen precursor to the carbon precursor in hydrothermal-based bottom-up synthetic routes, with typical nitrogen precursors being molecules such as urea [17,26] and EDA [32,33].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Environmental Impact and Efficiency of N-Doping Strategies in the Synthesis of Carbon Dots

Christé

Silva

2020

Materials

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The efficiency and associated environmental impacts of different N-doping strategies of carbon dots (CDs) were evaluated. More specifically, N-doped CDs were prepared from citric acid via two main synthesis routes: Microwave-assisted hydrothermal treatment with addition of N-containing small organic molecules (urea and ethylenediamine (EDA)); and microwave-assisted solvothermal treatment in N-containing organic solvents (n,n-dimethylformamide (DMF), acetonitrile and pyridine). These syntheses produced CDs with similar blue emission. However, XPS analysis revealed that CDs synthesized via both hydrothermal routes presented a better N-doping efficiency (~15 at.%) than all three solvothermal-based strategies (0.6–7 at.%). However, from the former two hydrothermal strategies, only the one involving EDA as a nitrogen-source provided a non-negligible synthesis yield, which indicates that this should be the preferred strategy. This conclusion was supported by a subsequent life cycle assessment (LCA) study, which revealed that this strategy is clearly the most sustainable one from all five studied synthesis routes.

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“…The excitation wavelengths were increased from 290 to 370 nm, and the maximum emission peak was seen at 447 nm with an excitation wavelength of 350 nm (Fig. 2b) [33]. The fluorescence mechanism of N, S-CQDs under varied excitation wavelengths, is shown in Fig.…”

Section: Characterizationmentioning

confidence: 87%

“…Figure 2a represents the UV-Vis absorption of CQDs solutions. A specific absorption peak at ~ 268 nm related to the π-π* transition of electrons in the conjugated C=C band, and adsorption peak at 300 ~ 350 nm assigned to the n-π* transition of C=N, C-N, C=S, and C=O bonds [21,33,34]. The low-intensity absorption of n → π* is ascribed to the lower content and weak electron transition of the functional groups in CQDs.…”

Section: Characterizationmentioning

confidence: 99%

N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

et al. 2021

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This study aimed to develop non-metal elements for doping carbon quantum dots (CQDs) with nitrogen and sulfur (N, S-CQDs), which loaded inside hexagonal mesoporous silica (HMS) in order to effectively remove methylene blue dye (MB) from an aqueous solution. The histidine and cysteine amino acids were used as the source for synthesis N, S-CQDs through the hydrothermal method. Morphology and structure of the N, S-CQDs, and adsorbent (N, S-CQDs/HMS) were characterized by using different microscopic and spectroscopic techniques. The adsorption parameters such as adsorbent dosage (0.25–1 g/L), pH (2–10), contact time (15–75 min), and initial MB dye concentration (20–300 mg/L) were investigated. The maximum adsorption capacity and removal efficiency of MB were determined at 370.4 mg/g and 97%, respectively, under optimum conditions at 303 K. The adsorption isotherm studies were fitted with the Freundlich isotherm equation, and the dye removal kinetics of the adsorbent followed the pseudo-second-order model. Thermodynamic studies showed that the adsorption process had exothermic and spontaneous behavior. The removal of MB next to the Rhodamine B and Reactive Black 5 dyes indicated that the N, S-CQDs/HMS had excellent selective behavior for MB absorption. This prepared adsorbent could be well recycled with suitable activity after four repeated adsorption–desorption cycles. Results revealed that the porous characters, surface area, charge properties, reduction in the bandgap, and quantum yield of the N, S-CQDs/HMS were essential factors that affected dye adsorption.

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Nitrogen doped carbon dots: mechanism investigation and their application for label free CA125 analysis

Cited by 71 publications

References 32 publications

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

Recent Developments in Synthesis and Photocatalytic Applications of Carbon Dots

Evaluation of the Environmental Impact and Efficiency of N-Doping Strategies in the Synthesis of Carbon Dots

N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

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