Synthesis of Luminescent Graphene Quantum Dots with High Quantum Yield and Their Toxicity Study.
Dan Jiang,Yunping Chen,Na Li,Wen Li,Wang Zhenguo,Wang Zhenguo,Jingli Zhu,Hong Zhang,Bin Liu,Shan Xu +9 more
TLDR
GQDs with high quantum yield and strong photoluminescence show good biocompatibility, thus they show good promising for cell imaging, biolabeling and other biomedical applications.Abstract:
High fluorescence quantum yield graphene quantum dots (GQDs) have showed up as a new generation for bioimaging. In this work, luminescent GQDs were prepared by an ameliorative photo-Fenton reaction and a subsequent hydrothermal process using graphene oxide sheets as the precursor. The as-prepared GQDs were nanomaterials with size ranging from 2.3 to 6.4 nm and emitted intense green luminescence in water. The fluorescence quantum yield was as high as 24.6% (excited at 340 nm) and the fluorescence was strongest at pH 7. Moreover, the influences of low-concentration (12.5, 25 μg/mL) GQDs on the morphology, viability, membrane integrity, internal cellular reactive oxygen species level and mortality of HeLa cells were relatively weak, and the in vitro imaging demonstrated GQDs were mainly in the cytoplasm region. More strikingly, zebrafish embryos were co-cultured with GQDs for in vivo imaging, and the results of heart rate test showed the intake of small amounts of GQDs brought little harm to the cardiovascular of zebrafish. GQDs with high quantum yield and strong photoluminescence show good biocompatibility, thus they show good promising for cell imaging, biolabeling and other biomedical applications.read more
Citations
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Review of Carbon and Graphene Quantum Dots for Sensing
TL;DR: The authors suggest that with the potential of these nanomaterials in sensing more research is needed on understanding their optical properties and why the synthetic methods influence their properties so much, into methods of surface functionalization that provide greater selectivity in sensing and into new sensing concepts that utilise the virtues of these nano-materials.
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Graphene-Based Materials for Biosensors: A Review.
TL;DR: The points of view on the intrinsic properties of graphene and its surface engineering concerned with the transduction mechanisms in biosensing applications are presented and practical synthesis techniques along with prospective properties of the graphene-based materials are explained.
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Nitrogen-doped graphene and graphene quantum dots: A review onsynthesis and applications in energy, sensors and environment.
TL;DR: Doping of nitrogen is a promising strategy to modulate chemical, electronic, and structural functionalities of graphene (G)and graphene quantum dots (GQDs) for their outstanding properties in energy and environmental applications.
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Synergetic Protective Effect of the Ultralight MWCNTs/NCQDs Modified Separator for Highly Stable Lithium–Sulfur Batteries
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Synthesis and applications of graphene quantum dots: a review
TL;DR: In this article, top-down and bottom-up strategies for the fabrication of GQDs, mainly containing oxidative cleavage, the hydrothermal or solvothermal method, the ultrasonic-assisted or microwave-assisted process, electrochemical oxidation, controllable synthesis, and carbonization from small molecules or polymers, are discussed.
References
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Probing the Cytotoxicity Of Semiconductor Quantum Dots.
TL;DR: This work found that CdSe-core QDs were indeed acutely toxic under certain conditions and modulated by processing parameters during synthesis, exposure to ultraviolet light, and surface coatings, and suggests that cytotoxicity correlates with the liberation of free Cd2+ ions due to deterioration of the Cd Se lattice.
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Chaotic Dirac billiard in graphene quantum dots.
Leonid Ponomarenko,Fred Schedin,Mikhail I. Katsnelson,R. Yang,Ernie W. Hill,Kostya S. Novoselov,A. K. Geim +6 more
TL;DR: This work reports on electron transport in quantum dot devices carved entirely from graphene, demonstrating the possibility of molecular-scale electronics based on graphene.
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Graphene quantum dots derived from carbon fibers.
Juan Peng,Wei Gao,Bipin Kumar Gupta,Bipin Kumar Gupta,Zheng Liu,Rebeca Romero-Aburto,Rebeca Romero-Aburto,Liehui Ge,Li Song,Lawrence B. Alemany,Xiaobo Zhan,Guanhui Gao,Guanhui Gao,Sajna Antony Vithayathil,Benny Abraham Kaipparettu,Angel A. Martí,Takuya Hayashi,Jun-Jie Zhu,Pulickel M. Ajayan +18 more
TL;DR: It is reported that during the acid treatment and chemical exfoliation of traditional pitch-based carbon fibers, that are both cheap and commercially available, the stacked graphitic submicrometer domains of the fibers are easily broken down, leading to the creation of GQDs with different size distribution in scalable amounts.
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Graphene quantum dots: emergent nanolights for bioimaging, sensors, catalysis and photovoltaic devices
TL;DR: Recent developments in preparation of GQDs are discussed, focusing on the main two approaches (top-down and bottom-down).
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Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots
Libin Tang,Rongbin Ji,Xiangke Cao,Jingyu Lin,Hongxing Jiang,Li Xueming,Kar Seng Teng,Chi Man Luk,Songjun Zeng,Jianhua Hao,Shu Ping Lau +10 more
TL;DR: The G QDs are capable of converting blue light into white light when the GQDs are coated onto a blue light emitting diode and the photoluminescence quantum yields were determined to be 7-11%.