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      Controllable size-selective method to prepare graphene quantum dots from graphene oxide

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          Abstract

          We demonstrated one-step method to fabricate two different sizes of graphene quantum dots (GQDs) through chemical cutting from graphene oxide (GO), which had many advantages in terms of simple process, low cost, and large scale in manufacturing with higher production yield comparing to the reported methods. Several analytical methods were employed to characterize the composition and morphology of the resultants. Bright blue luminescent GQDs were obtained with a produced yield as high as 34.8%. Moreover, how the different sizes affect fluorescence wavelength mechanism was investigated in details.

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          Most cited references15

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          Electric Field Effect in Atomically Thin Carbon Films

          We report a naturally-occurring two-dimensional material (graphene that can be viewed as a gigantic flat fullerene molecule, describe its electronic properties and demonstrate all-metallic field-effect transistor, which uniquely exhibits ballistic transport at submicron distances even at room temperature.
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            Graphene: Status and Prospects

            A. K. Geim (2010)
            Graphene is a wonder material with many superlatives to its name. It is the thinnest material in the universe and the strongest ever measured. Its charge carriers exhibit giant intrinsic mobility, have the smallest effective mass (it is zero) and can travel micrometer-long distances without scattering at room temperature. Graphene can sustain current densities 6 orders higher than copper, shows record thermal conductivity and stiffness, is impermeable to gases and reconciles such conflicting qualities as brittleness and ductility. Electron transport in graphene is described by a Dirac-like equation, which allows the investigation of relativistic quantum phenomena in a bench-top experiment. What are other surprises that graphene keeps in store for us? This review analyses recent trends in graphene research and applications, and attempts to identify future directions in which the field is likely to develop.
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              Longitudinal unzipping of carbon nanotubes to form graphene nanoribbons.

              Graphene, or single-layered graphite, with its high crystallinity and interesting semimetal electronic properties, has emerged as an exciting two-dimensional material showing great promise for the fabrication of nanoscale devices. Thin, elongated strips of graphene that possess straight edges, termed graphene ribbons, gradually transform from semiconductors to semimetals as their width increases, and represent a particularly versatile variety of graphene. Several lithographic, chemical and synthetic procedures are known to produce microscopic samples of graphene nanoribbons, and one chemical vapour deposition process has successfully produced macroscopic quantities of nanoribbons at 950 degrees C. Here we describe a simple solution-based oxidative process for producing a nearly 100% yield of nanoribbon structures by lengthwise cutting and unravelling of multiwalled carbon nanotube (MWCNT) side walls. Although oxidative shortening of MWCNTs has previously been achieved, lengthwise cutting is hitherto unreported. Ribbon structures with high water solubility are obtained. Subsequent chemical reduction of the nanoribbons from MWCNTs results in restoration of electrical conductivity. These early results affording nanoribbons could eventually lead to applications in fields of electronics and composite materials where bulk quantities of nanoribbons are required.
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                Author and article information

                Contributors
                iamtjfan@126.com
                65215669@qq.com
                1252568226@qq.com
                chunqiu348@126.com
                417682336@qq.com
                caikaiyu@qq.com
                yidong.liu@fangyuanyc.com
                wei-huang@njupt.edu.cn
                iamygmin@njupt.edu.cn
                epstein.2@osu.edu
                Journal
                Nanoscale Res Lett
                Nanoscale Res Lett
                Nanoscale Research Letters
                Springer US (Boston )
                1931-7573
                1556-276X
                8 February 2015
                8 February 2015
                2015
                : 10
                : 55
                Affiliations
                [ ]Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing, Jiangsu 210046 China
                [ ]State Key Laboratory of Organic Electronics and Information Displays and Fountain Global Photoelectric Technology Co. Ltd, 2 Xinyue Road, Yancheng, Jiangsu 224000 China
                [ ]Department of Physics and Chemistry & Biochemistry, The Ohio State University, Columbus, OH 43210 USA
                Article
                783
                10.1186/s11671-015-0783-9
                4385023
                25977644
                8cbd30fe-2b7d-424b-9d0b-837587c47a53
                © Fan et al. ; licensee Springer. 2015

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

                History
                : 22 December 2014
                : 24 January 2015
                Categories
                Nano Express
                Custom metadata
                © The Author(s) 2015

                Nanomaterials
                graphene oxide,graphene quantum dots,chemical cutting,fluorescence mechanism,81.07.ta (fabrication of quantum dots),68.65.hb (structure and nonelectronic properties of quantum dots),61.48.gh (graphene structure)

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