The effect of oxygen on the microwave-assisted synthesis of carbon quantum dots from polyethylene glycol

Zhao, Yunyang; Zuo, Songlin; Miao, Meng

doi:10.1039/c7ra01804e

Cited by 31 publications

(14 citation statements)

References 38 publications

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“…CQDs are synthesized in different atmospheres such as pure oxygen, nitrogen and carbon dioxide. CQDs synthesized in pure oxygen show higher PL intensity levels than those of N 2 and CO 2 atmosphere 342.…”

Section: Properties Of Carbon Quantum Dotsmentioning

confidence: 88%

Biomass‐derived Carbon Quantum Dots – A Review. Part 1: Preparation and Characterization

et al. 2021

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The preparation of nanostructured carbon materials from chosen biomass through hydrothermal carbonization and pyrolysis processes by optimizing the reaction conditions is one of the bases for applying the product in certain of the development activities. The finished product more or less reflects the raw material and the way of preparation. Among the many products, carbon quantum dots (CQDs) have gained importance due to their bolstered characteristics and facile preparation. CQDs are zero‐dimensional (0D) nanomaterials which attracted attention in the recent past due to their excellent water solubility, unique optical properties, good electrical conductivity, eco‐friendliness, and biocompatibility. Small‐sized CQDs offer high surface area per unit volume, strong tunable fluorescence, photo‐luminescent emissions, and semiconducting properties. In this paper, identification of ideal raw materials, process parameters being followed in the preparation of CQDs through hydrothermal carbonization and pyrolysis techniques, and the properties of the resultant CQDs commensurate with the nature of process are reviewed.

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Section: Properties Of Carbon Quantum Dotsmentioning

confidence: 88%

Biomass‐derived Carbon Quantum Dots – A Review. Part 1: Preparation and Characterization

et al. 2021

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“…Synthesis of CQDs using poly(ethylene glycol (PEG) as precursor under oxygen atmosphere resulted in particles with remarkable photoluminescent properties. 60 To decrease the synthesis time of CQDs and obtain different sizes and properties by varying irradiation power and duration, microwave synthesis is the best option. Yang et al…”

Section: Microwave Synthesismentioning

confidence: 99%

Carbon-based quantum particles: an electroanalytical and biomedical perspective

et al. 2019

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“…It was found that the fluorescence emission intensity remained nearly the same for at least 6 weeks (Figure 3d). Based on these results, the carbon Polyethyleneimine 0.7 [18] Poly(ethylene glycol) 7.8 [43] Polystyrene 13.0 [44] Polyvinylpyrrolidone 23.6 [45] Crosslinking poly(acrylic acid) and ethylenediamine 44.2 [46] Polyurethane 24.0 This work dots did not photobleach and are therefore the proper fluorophores for applications that require long-term photostability.…”

Section: Synthesis and Characterizations Of Carbon Dotsmentioning

confidence: 99%

Highly sensitive Ni²⁺ sensors based on polyurethane‐derived, label‐free carbon dots with high adsorption capacity

et al. 2021

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In this work, the novel, simple Ni 2 + sensors with high sensitivity, selectivity, accuracy, practicality, and adsorption capacity were developed from the label-free carbon dots. The carbon dots were prepared from polyurethane through a onestep pyrolysis method. They exhibited excitation-independent photoluminescence and offered a fluorescence quantum yield of 24 %. They were then tested for metal ion sensing, showing selectivity towards Ni 2 + against a range of metal ions with a detection limit of 3.14 μM, the best for the carbon dots reported to date. A carbon dot-loaded paper-based sensor was also fabricated for Ni 2 + detection, showing a limit of detection of 43.3 μM. The detection of Ni 2 + in real water samples showed excellent recovery of 95.6 to 99.2 %. The selective detection of Ni 2 + by the carbon dots arose from the inner filter effect and complex formation, leading to fluorescence quenching of the carbon dots. X-ray absorption analysis further confirmed the unique interaction and electron transfer from the carbon dots to Ni 2 + . In addition to high-performance sensing, the carbon dots demonstrated high adsorbent capacity towards Ni 2 + , in which one nanoparticle could accommodate up to 182 Ni 2 + ions, equivalent to 234.8 mg g À 1 . This work demonstrates the unique sensing and adsorbent properties of polyurethanederived carbon dots towards Ni 2 + , which can be applied for simultaneous monitoring and cleaning.

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The effect of oxygen on the microwave-assisted synthesis of carbon quantum dots from polyethylene glycol

Abstract: Fluorescent carbon quantum dots (CQDs) were synthesized using polyethylene glycol (PEG) as both the carbon source and solvent in various atmospheres including air, nitrogen, carbon dioxide and oxygen by following a microwave irradiation method.

Cited by 31 publications

References 38 publications

Biomass‐derived Carbon Quantum Dots – A Review. Part 1: Preparation and Characterization

Biomass‐derived Carbon Quantum Dots – A Review. Part 1: Preparation and Characterization

Carbon-based quantum particles: an electroanalytical and biomedical perspective

Highly sensitive Ni²⁺ sensors based on polyurethane‐derived, label‐free carbon dots with high adsorption capacity

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The effect of oxygen on the microwave-assisted synthesis of carbon quantum dots from polyethylene glycol

Abstract: Fluorescent carbon quantum dots (CQDs) were synthesized using polyethylene glycol (PEG) as both the carbon source and solvent in various atmospheres including air, nitrogen, carbon dioxide and oxygen by following a microwave irradiation method.

Cited by 31 publications

References 38 publications

Biomass‐derived Carbon Quantum Dots – A Review. Part 1: Preparation and Characterization

Biomass‐derived Carbon Quantum Dots – A Review. Part 1: Preparation and Characterization

Carbon-based quantum particles: an electroanalytical and biomedical perspective

Highly sensitive Ni2+ sensors based on polyurethane‐derived, label‐free carbon dots with high adsorption capacity

Contact Info

Product

Resources

About

Highly sensitive Ni²⁺ sensors based on polyurethane‐derived, label‐free carbon dots with high adsorption capacity