Preparation and functional study of cellulose/carbon quantum dot composites

Zou, Wen-Sheng; Ma, Xiaofei; Zheng, Pengwu

doi:10.1007/s10570-019-02926-8

Cited by 39 publications

(23 citation statements)

References 41 publications

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“…The surface chemical composition and element status of N-CQDs were investigated further utilizing X-ray photoelectron spectroscopy (XPS). The XPS spectrum of N-CQD in Figure 2a shows three peaks at 532.3 eV, 286 eV and 400.4 eV, corresponding to O1s, C1s and N1s, respectively [26,44,45], indicating that N-CQDs are mostly constituted of carbon, nitrogen, and oxygen. The high resolution XPS spectrum of C1s in Figure 2b shows five peaks at 284.6 eV, 285.5 eV, 286.4 eV, 287.1 eV and 288.3 eV that may be traced to C=C, C-C, C-N, C-O and C=O bonding on the surface of N-CQDs [26,46].…”

Section: The Morphology and Surface Composition Of N-cqdsmentioning

confidence: 99%

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Chang

Zhu

et al. 2022

Materials

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Nitrogen-doped carbon quantum dots (N-CQDs) were synthesized in a one-step hydrothermal technique utilizing L-lactic acid as that of the source of carbon and ethylenediamine as that of the source of nitrogen, and were characterized using dynamic light scattering, X-ray photoelectron spectroscopy ultraviolet-visible spectrum, Fourier-transformed infrared spectrum, high-resolution transmission electron microscopy, and fluorescence spectrum. The generated N-CQDs have a spherical structure and overall diameters ranging from 1–4 nm, and their surface comprises specific functional groups such as amino, carboxyl, and hydroxyl, resulting in greater water solubility and fluorescence. The quantum yield of N-CQDs (being 46%) is significantly higher than that of the CQDs synthesized from other biomass in literatures. Its fluorescence intensity is dependent on the excitation wavelength, and N-CQDs release blue light at 365 nm under ultraviolet light. The pH values may impact the protonation of N-CQDs surface functional groups and lead to significant fluorescence quenching of N-CQDs. Therefore, the fluorescence intensity of N-CQDs is the highest at pH 7.0, but it decreases with pH as pH values being either more than or less than pH 7.0. The N-CQDs exhibit high sensitivity to Fe3+ ions, for Fe3+ ions would decrease the fluorescence intensity of N-CQDs by 99.6%, and the influence of Fe3+ ions on N-CQDs fluorescence quenching is slightly affected by other metal ions. Moreover, the fluorescence quenching efficiency of Fe3+ ions displays an obvious linear relationship to Fe3+ concentrations in a wide range of concentrations (up to 200 µM) and with a detection limit of 1.89 µM. Therefore, the generated N-CQDs may be utilized as a robust fluorescence sensor for detecting pH and Fe3+ ions.

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Section: The Morphology and Surface Composition Of N-cqdsmentioning

confidence: 99%

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Chang

Zhu

et al. 2022

Materials

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“…Compared with "top-down" methods, the "bottom-up" methods have the advantages of abundant precursor sources, high yield, and controllable morphology. For example, Du et al synthesised water-soluble CQDs by hydrothermal reaction using citric acid and ethylenediamine as precursors (Figure 2) [35]. In addition, microwave-assisted methods are also used to synthesize CQDs because of their associated advantages of low equipment requirements, mild conditions, and fast reaction speeds.…”

Section: Carbon Quantum Dots (Cqds)mentioning

confidence: 99%

Electrochemiluminescence of Carbon‐based Quantum Dots: Synthesis, Mechanism and Application in Heavy Metal Ions Detection

Zhao

Luo

et al. 2021

Electroanalysis

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In recent years, carbon-based quantum dots as luminophores and co-reactants have aroused broad interest for their ability to function in electrochemiluminescence (ECL) sensors due to their unique features, including excellent biocompatibility, low toxicity, and water solubility. In this mini review, the synthesis methods of carbon-based quantum dots are firstly introduced.Then, the mechanism of carbon-based quantum dots as luminophores and co-reactants and their latest progress application in the detection of heavy metal ions are explored. Finally, the current challenges and potential future development directions of carbon-based quantum dots in ECL sensing filed for heavy metal ions analysis are summarized.

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“…In another study, Zou et al. [ 49 ] used solvothermal method and cotton to obtain blue CQDs with the maximum emission λ of 360 nm. At acidic conditions, a large amount of hydroxyl and carboxyl on the surface of the CQDs will undergo hydrogen bonding, leading to the agglomeration of CQDs, to the increasing of the particle size and the decreasing of fluorescence intensity.…”

Section: Synthesis Of Cqds From Carbohydratesmentioning

confidence: 99%

“…Additional information about the accuracy can be found in Supporting information S.2. [ 49,57,78,100,102 ]…”

Section: Cqds As Nano Sensors For Food Quality and Safetymentioning

confidence: 99%

Carbon Quantum Dots Based on Carbohydrates as Nano Sensors for Food Quality and Safety

et al. 2021

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Carbon quantum dots (CQDs) are a special type of nanostructure characterized for their low toxicity, environmentally friendliness, and ease of manufacture from varied carbon sources like carbohydrates. This carbon source is abundant in natural products and organic wastes, and it is suitable to be used in food applications like nano sensors for food quality and safety. Indeed, CQDs are foreseen as a potential new type of practical and unexpensive sensor to detect harmful substances commonly found in food. Limits of detection (LOD) of CQDs nano sensors have reached concentration level standards established by European Food Safety Authority for additives and heavy metals; nevertheless, for pathogens, safe limits of LOD are still not achieved. This study aims to carry out a review of CQDs obtained from carbohydrates of natural products and organic wastes as well as to describe their performance as sensors of additives, pathogens, and heavy metals in food quality and safety.

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Preparation and functional study of cellulose/carbon quantum dot composites

Cited by 39 publications

References 41 publications

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Synthesis and Properties of Nitrogen-Doped Carbon Quantum Dots Using Lactic Acid as Carbon Source

Electrochemiluminescence of Carbon‐based Quantum Dots: Synthesis, Mechanism and Application in Heavy Metal Ions Detection

Carbon Quantum Dots Based on Carbohydrates as Nano Sensors for Food Quality and Safety

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