Facile preparation and upconversion luminescence of graphene quantum dots

Shen, Jianhua; Zhu, Yihua; Cheng, Chen; Yang, Xin; Li, Chunzhong

doi:10.1039/c0cc04812g

Cited by 745 publications

(561 citation statements)

References 32 publications

(41 reference statements)

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“…Graphene quantum dots (GQDs) have been synthesized or fabricated from various carbon-based materials including fullerene 13 , glucose 14 , graphite or graphene oxides [15][16][17][18][19][20][21][22][23] , carbon nanotubes 24 and carbon fibres 25 . Physical approaches such as lithography 26 , which etch the size of graphene to B20 nm in width, are expensive and are impractical for the production of bulk quantities of material.…”

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confidence: 99%

Coal as an abundant source of graphene quantum dots

et al. 2013

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Coal is the most abundant and readily combustible energy resource being used worldwide. However, its structural characteristic creates a perception that coal is only useful for producing energy via burning. Here we report a facile approach to synthesize tunable graphene quantum dots from various types of coal, and establish that the unique coal structure has an advantage over pure sp 2 -carbon allotropes for producing quantum dots. The crystalline carbon within the coal structure is easier to oxidatively displace than when pure sp 2 -carbon structures are used, resulting in nanometre-sized graphene quantum dots with amorphous carbon addends on the edges. The synthesized graphene quantum dots, produced in up to 20% isolated yield from coal, are soluble and fluorescent in aqueous solution, providing promise for applications in areas such as bioimaging, biomedicine, photovoltaics and optoelectronics, in addition to being inexpensive additives for structural composites.

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confidence: 99%

Coal as an abundant source of graphene quantum dots

et al. 2013

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“…[11][12][13][14] Recently, it has been found that besides the traditional down-converted photoluminescence, CQDs also display excellent up-converted photoluminescence (UCPL), in which the emission wavelength is shorter than the excitation wavelength used. 15,16 Moreover, photoexcited CQDs can also act as excellent electron acceptors and electron donors, as the PL from CQDs can be quenched e±ciently by either electron donor or electron acceptor molecules in solution. 17,18 Therefore, the unique UCPL behavior of CQDs allows for the full exploitation of the solar light, although the photo-induced electron transfer property can facilitate the charge separation rate of CQDs/semiconductor composites.…”

Section: Introductionmentioning

confidence: 99%

Carbon Quantum Dots/Bi₂WO₆ Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

Zhang

Zheng

et al. 2017

NANO

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In this study, we report the facile fabrication of carbon quantum dots (CQDs)/Bi 2 WO 6 nanocomposites, as well as their e®ective photocatalytic activity for the photodegradation of organic pollutants and hydrogen production. The observed results here revealed that CQDs/Bi 2 WO 6 composites possessed much higher photocatalytic activity in the degradation of both rhodamine B and phenol under simulated solar light after optimizing the hybridization with CQDs, which was attributed to the excellent up-converted photoluminescence, photo-induced electron transfer and electron reservoir properties of CQDs. Signi¯cantly di®erent from pure Bi 2 WO 6 , the CQDs/ Bi 2 WO 6 composites also displayed excellent photocatalytic H 2 production activity, which can be ascribed to the suitable conduction band edge and su±cient reduction ability of CQDs.

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“…[234][235][236] In addition, GQDs possess unique optical properties such as pH-dependent and upconversion fluorescence behaviors, and GQDs are extensively used for cellular imaging in cells, organs, or tissues in this region. 237,238 Recently, Chen et al 239 reported the synthesis of composites of dextran-coated Fe 3 O 4 NPs and GO (Fe 3 O 4 -GO) as T2-weighted contrast agents for efficient cellular magnetic resonance imaging (MRI). Squaraine dyes were loaded inside mesoporous silica NPs, and the NP surfaces were then wrapped with ultrathin GO sheets; the resulted product exhibited remarkable stability and efficiently protected the loaded dye from nucleophilic attack.…”

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Synthesis, toxicity, biocompatibility, and biomedical applications of graphene and graphene-related materials

Gurunathan¹,

Kim²

2016

IJN

224

127

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Graphene is a two-dimensional atomic crystal, and since its development it has been applied in many novel ways in both research and industry. Graphene possesses unique properties, and it has been used in many applications including sensors, batteries, fuel cells, supercapacitors, transistors, components of high-strength machinery, and display screens in mobile devices. In the past decade, the biomedical applications of graphene have attracted much interest. Graphene has been reported to have antibacterial, antiplatelet, and anticancer activities. Several salient features of graphene make it a potential candidate for biological and biomedical applications. The synthesis, toxicity, biocompatibility, and biomedical applications of graphene are fundamental issues that require thorough investigation in any kind of applications related to human welfare. Therefore, this review addresses the various methods available for the synthesis of graphene, with special reference to biological synthesis, and highlights the biological applications of graphene with a focus on cancer therapy, drug delivery, bio-imaging, and tissue engineering, together with a brief discussion of the challenges and future perspectives of graphene. We hope to provide a comprehensive review of the latest progress in research on graphene, from synthesis to applications.

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Facile preparation and upconversion luminescence of graphene quantum dots

Cited by 745 publications

References 32 publications

Coal as an abundant source of graphene quantum dots

Coal as an abundant source of graphene quantum dots

Carbon Quantum Dots/Bi₂WO₆ Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

Synthesis, toxicity, biocompatibility, and biomedical applications of graphene and graphene-related materials

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Facile preparation and upconversion luminescence of graphene quantum dots

Cited by 745 publications

References 32 publications

Coal as an abundant source of graphene quantum dots

Coal as an abundant source of graphene quantum dots

Carbon Quantum Dots/Bi2WO6 Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

Synthesis, toxicity, biocompatibility, and biomedical applications of graphene and graphene-related materials

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Carbon Quantum Dots/Bi₂WO₆ Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution