One-step and high yield simultaneous preparation of single- and multi-layer graphene quantum dots from CX-72 carbon black

Dong, Yongqiang; Chen, Congqiang; Zheng, Xin Ting; Gao, Lili; Cui, Zhiming; Yang, Hongbin; Guo, Chunxian; Chi, Yuwu; Li, Chang Ming

doi:10.1039/c2jm30658a

Cited by 582 publications

(467 citation statements)

References 27 publications

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“…Aqueous solutions of GQDs and F-GQDs reveal black and achromatic colors, respectively, under sunlight [25]; Figure 3(a) (inset) shows that GQDs and F-GQDs emit bright yellow and green photoluminescence under irradiation by a 365 nm UV lamp, respectively. The GQDs have a weak absorption at 342 nm, which is close to previous reports [26], and a strong broad absorption at 480 nm, which is in the visible light range.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Luo

et al. 2017

Journal of Nanomaterials

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Fluorinated graphene quantum dots (F-GQDs) were prepared by mixing GQDs and XeF 2 in a facile gaseous phase heating method. The F-GQDs with excellent water solubility have a F/C atomic ratio of 84.25% and a diameter of 2-6 nm. The photoluminescence (PL) properties of GQDs and F-GQDs were investigated systematically. The results showed that the PL emission of the F-GQDs exhibited an obvious blue-shift of 90 nm compared to that of the GQDs.

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Section: Resultsmentioning

confidence: 99%

Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Luo

et al. 2017

Journal of Nanomaterials

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“…Chemical oxidation is widely used to synthesize GQDs (Figure 3(D)). This method highly depends on different carbon sources, such as carbon fibers, 47 coal, 18 carbon nanotubes, 46 graphite 41 and carbon black 45 in the mixture of strong acids (sulfuric acid and nitric acid). The carbon sources typically contain graphene sheets.…”

Section: Top-down Strategiesmentioning

confidence: 99%

“…38 The carbonaceous materials may be carbon fibers, 7 graphene, 30 GO, 39 graphite, 37,[40][41][42][43]44 carbon black, 45 carbon nanotubes, 46,47 coal. 48 Here, we summarize the top-down synthesis of GQDs and the related cutting mechanisms.…”

Section: Top-down Strategiesmentioning

confidence: 99%

Properties and Synthesis Strategies of Graphene Quantum Dots

Zhang¹,

Lu²

2017

Frontiers in Nanobiomedical Research

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Quantum dots (QDs) are usually referred to as semiconductor nanoparticles with their sizes in the quantum-confined regime, in which the excitons are confined in all the three spatial dimensions. Typical QDs are inorganic semiconductor nanocrystals from the group II-VI elements in the periodic table. However, the applications of these QDs are limited by their internal disadvantages, including intrinsic toxicity (e.g. in the case of widely studied CdSe QDs) and problems caused by the colloidal stability. Therefore, developing new QDs and relevant nanomaterials is necessary. Consequently, graphene quantum dots (GQDs), a class of zero-dimensional (0D) graphitic nanomaterials, have attracted increasing attention recently. Compared with semiconductor QDs, GQDs are superior in terms of low cytotoxicity, high dispersity in water and some polarity organic solvents, resistance to photobleaching and biocompatibility. In addition, the properties of GQDs are easier to be tuned through surface chemistry, indicating that researchers can design GQDs with various functionalities for different applications.

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“…GQDs were prepared following the method reported by Dong et al 28 Briefly, 0.2 g dried CX-72 carbon black was added to 50 mL HNO 3 (6 M). The product was centrifuged (2,770× g) for 10 minutes to separate the supernatant and sediment.…”

Section: Preparation Of Graphene Oxide (Go) Quantum Dotsmentioning

confidence: 99%

Antitumor effect of a Pt-loaded nanocomposite based on graphene quantum dots combats hypoxia-induced chemoresistance of oral squamous cell carcinoma

Zheng¹,

Yin²,

Cai³

et al. 2018

IJN

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Background Tumor microenvironment plays an important role in the chemoresistance of oral squamous cell carcinoma (OSCC). Hypoxia in the microenvironment is one of the important factors that contributes to OSCC chemoresistance; therefore overcoming hypoxia-mediated chemoresistance is one of the great challenges in clinical practice. Methods In this study, we developed a drug delivery system based on Pt-loaded, polyethylene glycol-modified graphene quantum dots via chemical oxidation and covalent reaction. Results Our results show that synthesized polyethylene glycol-graphene quantum dots-Pt (GPt) is about 5 nm in diameter. GPt sensitizes OSCC cells to its treatment in both normoxia and hypoxia conditions. Inductively coupled plasma-mass spectrometry assay shows that GPt enhances Pt accumulation in cells, which leads to a notable increase of S phase cell cycle arrest and apoptosis of OSCC cells in both normoxia and hypoxic conditions. Finally, compared with free cisplatin, GPt exhibits a strong inhibitory effect on the tumor growth with less systemic drug toxicity in an OSCC xenograft mouse tumor model. Conclusion Taken together, our results show that GPt demonstrates superiority in combating hypoxia-induced chemoresistance. It might serve as a novel strategy for future microenvironment-targeted cancer therapy.

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One-step and high yield simultaneous preparation of single- and multi-layer graphene quantum dots from CX-72 carbon black

Cited by 582 publications

References 27 publications

Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Properties and Synthesis Strategies of Graphene Quantum Dots

Antitumor effect of a Pt-loaded nanocomposite based on graphene quantum dots combats hypoxia-induced chemoresistance of oral squamous cell carcinoma

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