One-step hydrothermal synthesis and optical properties of self-quenching-resistant carbon dots towards fluorescent ink and as nanosensors for Fe<sup>3+</sup> detection

Xu, Dandan; Lei, Fang; Chen, Hetuo; Yin, Luqiao; Shi, Ying; Xie, Ju

doi:10.1039/c8ra10570g

Cited by 65 publications

(39 citation statements)

References 51 publications

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“…The blue florescent CQD also reveal a broad PL peak that shifted along with the increase of excitation wavelength, which might due to the quantum-confinement effect and edge defects. The unique phenomenon of excitation dependent photoluminescence behaviour proved that the reaction products must be photoluminescence CQD, which was also in agreement with optical properties that were synthesised by other research groups [ 63 , 64 , 65 ]. In contrast, EFB biochar, which was obtained without the hydrothermal process, did not show any fluorescence, which indicates that CQD was essentially unable to be extracted from it.…”

Section: Resultssupporting

confidence: 84%

Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

et al. 2020

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Carbon quantum dots (CQD) have great potential to be used in various applications due to their unique electrical and optical properties. Herein, a facile, green and eco-friendly hydrothermal method for the preparation of carbon quantum dots was achieved using empty fruit bunch (EFB) biochar as a renewable and abundant carbon source. In the current study, the role of the hydrothermal process was observed and studied by comparing the morphology and optical characteristics of CQD obtained from EFB biochar. Interestingly, based on the high-resolution transmission electron microscopy (HRTEM) result, a considerably similar carbon quantum dots structure can be observed for the EFB biochar sample, showing the similar size and distribution of CQD. To further discuss the extraction of CQD from EFB biochar, a mechanism based on hydrothermal-induced extraction of CQD is proposed. The optimal structure of CQD deduced by density functional theory (DFT) in energy and dipole momentum was about 2057.4905 Hatree and 18.1699 Debye, respectively. This study presents a practical experimental approach in elucidating the molecular structure of photoluminescence CQD based on the Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) results.

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Section: Resultssupporting

confidence: 84%

Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

et al. 2020

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“…[26,27] Generally aggregation induced quenching leading the disappearance of the fluorescence in the solid state and this has been the mostly encountered observation in case of carbon dots. [28,29] However, carbon dots showing inherent solid state fluorescence have also been reported only in a few cases [30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

Stimuli responsive multicolour fluorescence emission in carbon nanodots and application in metal free hydrogen evolution from water

Paul

Banerjee

2021

Nanoscale Adv.

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“…The distinctive bands of absorption at 1115 and 1387 cm −1 are because of the Cd-S bonds stretching vibrations [35]. Likewise, the peaks below 1000 cm −1 represent the stretching modes of metal sulfides, which confirms the formation of M-S in the synthesis [36]. The M-S vibrations, and the C-C stretching vibrations, are indication for the establishment of the CdS CA nanocomposite.…”

Section: Resultsmentioning

confidence: 67%

Rod-Shaped Carbon Aerogel-Assisted CdS Nanocomposite for the Removal of Methylene Blue Dye and Colorless Phenol

et al. 2020

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A carbon aerogel (CA)-assisted CdS nanocomposite was prepared by hydrothermal process and was investigated as a photocatalyst towards the photodegradation of methylene blue (MB) dye and colorless phenol under visible light irradiation (VLI). CdS have attracted wide attention due to their relatively narrow band gap for the visible light effect and the suitably negative potential of the conduction band (CB) edge for the neutralization of H+ ions. The obtained characterization results suggest that the CA-assisted CdS nanocomposite has enhanced photophysical properties, a more surface area, and the desired morphology at the nm scale. Under optimization, CdS CA 8% shows superior catalytic activity for degradation compared with other samples. The photocatalytic activities of the as-synthesized samples were examined under VLI through the MB and phenol degradation. Compared with pure CA and CdS, the CA (8%)-assisted CdS nanoparticles (NPs) offer significantly enhanced photocatalytic efficiency for MB and phenol. The mechanism of photocatalytic reaction was examined by adding various scavengers, and the results revealed that the holes generated in CA (8%)-assisted CdS NPs have a crucial impact on the visible light photocatalytic process. The improved photocatalytic degradation was due to the strong interaction between the CA and CdS NPs.

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One-step hydrothermal synthesis and optical properties of self-quenching-resistant carbon dots towards fluorescent ink and as nanosensors for Fe³⁺ detection

Abstract: Blue CDs with a quantum yield of 30.21% were successfully synthesized by a simple one-pot hydrothermal treatment using citric acid (carbon source) and polyvinyl pyrrolidone (nitrogen source) as the raw materials towards fluorescent ink and as nanosensors for Fe3+ detection.

Cited by 65 publications

References 51 publications

Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

Stimuli responsive multicolour fluorescence emission in carbon nanodots and application in metal free hydrogen evolution from water

Rod-Shaped Carbon Aerogel-Assisted CdS Nanocomposite for the Removal of Methylene Blue Dye and Colorless Phenol

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One-step hydrothermal synthesis and optical properties of self-quenching-resistant carbon dots towards fluorescent ink and as nanosensors for Fe3+ detection

Abstract: Blue CDs with a quantum yield of 30.21% were successfully synthesized by a simple one-pot hydrothermal treatment using citric acid (carbon source) and polyvinyl pyrrolidone (nitrogen source) as the raw materials towards fluorescent ink and as nanosensors for Fe3+ detection.

Cited by 65 publications

References 51 publications

Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

Acid-Free Hydrothermal-Extraction and Molecular Structure of Carbon Quantum Dots Derived from Empty Fruit Bunch Biochar

Stimuli responsive multicolour fluorescence emission in carbon nanodots and application in metal free hydrogen evolution from water

Rod-Shaped Carbon Aerogel-Assisted CdS Nanocomposite for the Removal of Methylene Blue Dye and Colorless Phenol

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One-step hydrothermal synthesis and optical properties of self-quenching-resistant carbon dots towards fluorescent ink and as nanosensors for Fe³⁺ detection