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Graphene quantum dot

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73: 32: 175: 280:, when GQDs are dispersed in water. Their electronic structure depends sensitively on the crystallographic orientation of their edges, for example zigzag-edge GQDs with 7-8 nm diameter show a metallic behavior. In general, their energy gap decreases, when the number of graphene layers or the number of carbon atoms per graphene layer is increased. 316:
study in zebrafish larvae observed the alteration of 2116 gene expressions. These inconsistent findings may be attributed to the diversity of the used GQDs, as the related toxicity is dependent on particle size, surface functional groups, oxygen content, surface charges and impurities. Currently, the
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studies, based on cell cultures, show only marginal effects of GQDs on the viability of human cells. An in-depth look at the gene expression changes caused by GQDs with a size of 3 nm revealed that only one, namely the selenoprotein W, 1 out of 20 800 gene expressions was affected significantly
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Kersting, David; Fasbender, Stefan; Pilch, Rabea; Kurth, Jennifer; Franken, André; Ludescher, Marina; Naskou, Johanna; Hallenberger, Angelika; Gall, Charlotte von; Mohr, Corinna J; Lukowski, Robert; Raba, Katharina; Jaschinski, Sandra; Esposito, Irene; Fischer, Johannes C; Fehm, Tanja; Niederacher,
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Presently, a range of techniques have been developed to prepare GQDs. These methods are normally classified into two groups top down and bottom up. Top down approaches applied different techniques to cut bulk graphitic materials into GQDs including graphite, graphene, carbon nanotubes, coal, carbon
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The toxicity of graphene-family nanoparticles is a matter of ongoing research. The toxicity (both in vivo and cytotoxicity) of GQDs are related to a variety of factors including particle size, methods of synthesis, chemical doping and so on. Many authors claim, that GQDs are biocompatible and cause
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Graphene quantum dots (GQDs) consist of one or a few layers of graphene and are smaller than 100 nm in size. They are chemically and physically stable, have a large surface to mass ratio and can be dispersed in water easily due to functional groups at the edges. The fluorescence emission of
353:, and the ultrasonic exfoliation method. Top down methods usually need intense purification as strong mixed acids are used in these methods. On the other hand, bottom up methods assemble GQDs from small organic molecules such as citric acid and glucose. These GQDs have better biocompatibility. 1143:
Zhu, Shoujun; Zhang, Junhu; Qiao, Chunyan; Tang, Shijia; Li, Yunfeng; Yuan, Wenjing; Li, Bo; Tian, Lu; Liu, Fang; Hu, Rui; Gao, Hainan; Wei, Haotong; Zhang, Hao; Sun, Hongchen; Yang, Bai (2011). "Strongly green-photoluminescent graphene quantum dots for bioimaging applications".
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GQDs can extend across a broad spectral range, including the UV, visible, and IR. The origin of GQD fluorescence emission is a subject of debate, as it has been related to quantum confinement effects, defect states and functional groups that might depend on the
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Deng, Shun; Jia, Pan-Pan; Zhang, Jing-Hui; Junaid, Muhammad; Niu, Aping; Ma, Yan-Bo; Fu, Ailing; Pei, De-Sheng (September 2018). "Transcriptomic response and perturbation of toxicity pathways in zebrafish larvae after exposure to graphene quantum dots (GQDs)".
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Tang, Libin; Ji, Rongbin; Cao, Xiangke; Lin, Jingyu; Jiang, Hongxing; Li, Xueming; Teng, Kar Seng; Luk, Chi Man; Zeng, Songjun; Hao, Jianhua; Lau, Shu Ping (2012). "Deep Ultraviolet Photoluminescence of Water-Soluble Self-Passivated Graphene Quantum Dots".
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Zhao, Jianhong; Tang, Libin; Xiang, Jinzhong; Ji, Rongbin; Yuan, Jun; Zhao, Jun; Yu, Ruiyun; Tai, Yunjian; Song, Liyuan (2014). "Chlorine doped graphene quantum dots: Preparation, properties, and photovoltaic detectors".
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Thakur, Mukeshchand; Mewada, Ashmi; Pandey, Sunil; Bhori, Mustansir; Singh, Kanchanlata; Sharon, Maheshwar; Sharon, Madhuri (2016). "Milk-derived multi-fluorescent graphene quantum dot-based cancer theranostic system".
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Wu, Zhu Lian; Gao, Ming Xuan; Wang, Ting Ting; Wan, Xiao Yan; Zheng, Lin Ling; Huang, Cheng Zhi (2014). "A general quantitative pH sensor developed with dicyandiamide N-doped high quantum yield graphene quantum dots".
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Fasbender, Stefan; Allani, Sonja; Wimmenauer, Christian; Cadeddu, Ron-Patrick; Raba, Katharina; Fischer, Johannes C.; Bulat, Bekir; Luysberg, Martina; Seidel, Claus A. M.; Heinzel, Thomas; Haas, Rainer (2017).
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Wang, Shujun; Chen, Zhi-Gang; Cole, Ivan; Li, Qin (February 2015). "Structural evolution of graphene quantum dots during thermal decomposition of citric acid and the corresponding photoluminescence".
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Shang, Weihu; Zhang, Xiaoyan; Zhang, Mo; Fan, Zetan; Sun, Ying; Han, Mei; Fan, Louzhen (2014). "The uptake mechanism and biocompatibility of graphene quantum dots with human neural stem cells".
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Li, Xueming; Lau, Shu Ping; Tang, Libin; Ji, Rongbin; Yang, Peizhi (2014). "Sulphur doping: A facile approach to tune the electronic structure and optical properties of graphene quantum dots".
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Xie, Yichun; Wan, Bin; Yang, Yu; Cui, Xuejing; Xin, Yan; Guo, Liang-Hong (March 2019). "Cytotoxicity and autophagy induction by graphene quantum dots with different functional groups".
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Wimmenauer, Christian; Scheller, Julienne; Fasbender, Stefan; Heinzel, Thomas (2019). "Single-particle energy – and optical absorption – spectra of multilayer graphene quantum dots".
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Li, Lingling; Wu, Gehui; Yang, Guohai; Peng, Juan; Zhao, Jianwei; Zhu, Jun-Jie (2013). "Focusing on luminescent graphene quantum dots: Current status and future perspectives".
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Tang, Libin; Ji, Rongbin; Li, Xueming; Teng, Kar Seng; Lau, Shu Ping (2013). "Size-Dependent Structural and Optical Characteristics of Glucose-Derived Graphene Quantum Dots".
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Shen, Jianhua; Zhu, Yihua; Yang, Xiaoling; Li, Chunzhong (2012). "Graphene quantum dots: emergent nanolights for bioimaging, sensors, catalysis and photovoltaic devices".
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Campbell, Elizabeth; Hasan, Md Tanvir; Gonzalez-Rodriguez, Roberto; Truly, Tate; Lee, Bong Han; Green, Kayla N.; Akkaraju, Giridhar; Naumov, Anton V. (October 2021).
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Tang, Libin; Ji, Rongbin; Li, Xueming; Bai, Gongxun; Liu, Chao Ping; Hao, Jianhua; Lin, Jingyu; Jiang, Hongxing; Teng, Kar Seng; Yang, Zhibin; Lau, Shu Ping (2014).
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Fasbender, Stefan; Zimmermann, Lisa; Cadeddu, Ron-Patrick; Luysberg, Martina; Moll, Bastian; Janiak, Christoph; Heinzel, Thomas; Haas, Rainer (19 August 2019).
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Wang, Dan; Chen, Jiang-Fen; Dai, Liming (2014). "Recent Advances in Graphene Quantum Dots for Fluorescence Bioimaging from Cells through Tissues to Animals".
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Pan, Dengyu; Zhang, Jingchun; Li, Zhen; Wu, Minghong (2010). "Hydrothermal Route for Cutting Graphene Sheets into Blue‐Luminescent Graphene Quantum Dots".
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Wang, Shujun; Cole, Ivan S.; Zhao, Dongyuan; Li, Qin (2016). "The dual roles of functional groups in the photoluminescence of graphene quantum dots".
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Li, Xueming; Lau, Shu Ping; Tang, Libin; Ji, Rongbin; Yang, Peizhi (2013). "Multicolour light emission from chlorine-doped graphene quantum dots".
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Ritter, Kyle A; Lyding, Joseph W (2009). "The influence of edge structure on the electronic properties of graphene quantum dots and nanoribbons".
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properties induced by the quantum confinement effect and edge effect. They have possible applications in treatment of Alzheimer's disease,
1818:"Multifunctional graphene quantum dots for combined photothermal and photodynamic therapy coupled with cancer cell tracking applications" 185: 1181:"The Low Toxicity of Graphene Quantum Dots is Reflected by Marginal Gene Expression Changes of Primary Human Hematopoietic Stem Cells" 228: 210: 156: 59: 137: 312:
studies observe a distinct decrease of cell viability and the induction of autophagy after exposure of the cells to GQDs and one
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Ghosh, Shampa; Sachdeva, Bhuvi; Sachdeva, Punya; Chaudhary, Vishal; Rani, Gokana Mohana; Sinha, Jitendra Kumar (2022-10-01).
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Güçlü, A. D; Potasz, P; Hawrylak, P (2011). "Electric-field controlled spin in bilayer triangular graphene quantum dots".
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effect, GQDs are considered as a novel material for biological, opto-electronics, energy and environmental applications.
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Ou, Lingling; Song, Bin; Liang, Huimin; Liu, Jia; Feng, Xiaoli; Deng, Bin; Sun, Ting; Shao, Longquan (31 October 2016).
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only low toxicity as they are just composed of organic materials, which should lead to an advantage over semiconductor
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Kumawat, Mukesh Kumar; Thakur, Mukeshchand; Gurung, Raju B; Srivastava, Rohit (2017). "Graphene Quantum Dots from
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Graphene quantum dots are studied as an advanced multifunctional material due to their unique
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Wang, Shujun; Cole, Ivan S.; Li, Qin (2016). "The toxicity of graphene quantum dots".
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literature is insufficient to draw conclusions about the potential hazards of GQDs.
565:"Graphene quantum dot formulation for cancer imaging and redox-based drug delivery" 300: 252: 1874: 1293: 1899:: subcellular localization and uptake of graphene quantum dots into solid tumors" 1684: 639: 622: 366: 72: 1960: 1923: 1890: 1739: 1419: 1340: 1204: 909: 580: 522: 472: 1861:: Application in Near-Infrared Bioimaging and Intracellular Nanothermometry". 1249: 952: 378: 1999: 1786: 588: 530: 511:
Materials Science & Engineering. C, Materials for Biological Applications
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Bogireddy, Naveen Kumar Reddy; Barba, Victor; Agarwal, Vivechana (2019).
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Lu, Huiting; Li, Wenjun; Dong, Haifeng; Wei, Menglian (September 2019).
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Thakur, Mukeshchand; Kumawat, Mukesh Kumar; Srivastava, Rohit (2017).
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assisted hydrothermal method (MAH), the Soft-Template method, the
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in primary human hematopoietic stem cells. On the contrary, other
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may be in need of reorganization to comply with Knowledge (XXG)'s
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Dieter; Neubauer, Hans; Heinzel, Thomas (27 September 2019).
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black and carbon fibres. These techniques mainly include
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(2018). 569:Nanomedicine: Nanotechnology, Biology and Medicine 16:Graphene nanoparticle with a size less than 100 nm 1459:Particle & Particle Systems Characterization 669:Particle & Particle Systems Characterization 507:"Graphene quantum dots redefine nanobiomedicine" 1763:"Graphene Quantum Dots for Optical Bioimaging" 848: 846: 500: 498: 195:to make improvements to the overall structure. 929: 927: 8: 1863:ACS Sustainable Chemistry & Engineering 60:Learn how and when to remove these messages 662: 660: 616: 614: 290:Health and safety hazards of nanomaterials 2007: 1922: 1841: 1721: 1692: 1611: 1523: 1478: 1394: 1348: 1212: 1127: 961: 951: 782: 648: 638: 229:Learn how and when to remove this message 211:Learn how and when to remove this message 157:Learn how and when to remove this message 440: 1323:Guo, Xiaoqing; Mei, Nan (March 2014). 505:Henna, T. K.; Pramod, K. (May 2020). 7: 1949:Materials Science and Engineering: C 558: 556: 450: 448: 446: 444: 263:, chemical stability and pronounced 95:adding citations to reliable sources 14: 1329:Journal of Food and Drug Analysis 1238:Journal of Environmental Sciences 898:Superlattices and Microstructures 405:, and photoluminescent material, 41:This article has multiple issues. 1504:Journal of Materials Chemistry C 173: 71: 30: 334:, electrochemical preparation, 82:needs additional citations for 49:or discuss these issues on the 1282:Journal of Hazardous Materials 1: 1875:10.1021/acssuschemeng.6b01893 1294:10.1016/j.jhazmat.2018.05.063 940:Particle and Fibre Toxicology 1685:10.1016/j.carbon.2014.10.075 640:10.1016/j.mtchem.2018.09.007 429:Carbon nanotube quantum dot 2059: 1961:10.1016/j.msec.2016.05.007 1740:10.1103/PhysRevB.84.035425 1341:10.1016/j.jfda.2014.01.009 1205:10.1038/s41598-019-48567-6 910:10.1016/j.spmi.2019.106171 581:10.1016/j.nano.2021.102408 523:10.1016/j.msec.2020.110651 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