High-yield production of graphene by liquid-phase exfoliation of graphite
Yenny Hernandez,Valeria Nicolosi,Mustafa Lotya,Fiona M. Blighe,Zhenyu Sun,Sukanta De,I.T. McGovern,Brendan Holland,Michele T. Byrne,Yurii K. Gun'ko,John J. Boland,Peter Niraj,Georg S. Duesberg,Satheesh Krishnamurthy,Robbie Goodhue,John L. Hutchison,Vittorio Scardaci,Andrea C. Ferrari,Jonathan N. Coleman +18 more
TLDR
Graphene dispersions with concentrations up to approximately 0.01 mg ml(-1), produced by dispersion and exfoliation of graphite in organic solvents such as N-methyl-pyrrolidone are demonstrated.Abstract:
Fully exploiting the properties of graphene will require a method for the mass production of this remarkable material. Two main routes are possible: large-scale growth or large-scale exfoliation. Here, we demonstrate graphene dispersions with concentrations up to approximately 0.01 mg ml(-1), produced by dispersion and exfoliation of graphite in organic solvents such as N-methyl-pyrrolidone. This is possible because the energy required to exfoliate graphene is balanced by the solvent-graphene interaction for solvents whose surface energies match that of graphene. We confirm the presence of individual graphene sheets by Raman spectroscopy, transmission electron microscopy and electron diffraction. Our method results in a monolayer yield of approximately 1 wt%, which could potentially be improved to 7-12 wt% with further processing. The absence of defects or oxides is confirmed by X-ray photoelectron, infrared and Raman spectroscopies. We are able to produce semi-transparent conducting films and conducting composites. Solution processing of graphene opens up a range of potential large-area applications, from device and sensor fabrication to liquid-phase chemistry.read more
Citations
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Microwave Synthesis of Large Few-Layer Graphene Sheets in Aqueous Solution of Ammonia
Izabela Janowska,Kambiz Chizari,Ovidiu Ersen,Spyridon Zafeiratos,D. Soubane,Victor Da Costa,Virginie Speisser,Christine Boeglin,Matthieu Houllé,Dominique Begin,Dominique Plee,Marc-Jacques Ledoux,Cuong Pham-Huu +12 more
TL;DR: In this paper, a few-layer graphene (FLG) sheet with sizes exceeding several micrometers was synthesized by exfoliation of expanded graphite in aqueous solution of ammonia under microwave irradiation.
Journal ArticleDOI
Mode-locking of Er-doped fiber laser using a multilayer MoS2 thin film as a saturable absorber in both anomalous and normal dispersion regimes.
TL;DR: Application of a multilayer Molybdenum Disulfide thin film as a saturable absorber was experimentally demonstrated by realizing a stable and robust passive mode-locked fiber laser via the evanescent field interaction between the light and the film.
Journal ArticleDOI
Synthesis of reduced graphene nanosheet/urchin-like manganese dioxide composite and high performance as supercapacitor electrode
Wanlu Yang,Zan Gao,Jun Wang,Bin Wang,Qi Liu,Zhanshuang Li,Tom Mann,Piaoping Yang,Milin Zhang,Lianhe Liu +9 more
TL;DR: In this paper, a reduced graphene nanosheet/urchin-like manganese dioxide (GNS/MnO 2 ) composite for a supercapacitor electrode has been fabricated by a mild hydrothermal route.
Journal ArticleDOI
Polymer brushes on graphene.
Marin Steenackers,Alexander M. Gigler,Ning Zhang,Frank Deubel,Max Seifert,Lucas H. Hess,Candy Haley Yi Xuan Lim,Kian Ping Loh,Jose A. Garrido,Rainer Jordan,Rainer Jordan,Martin Stutzmann,Ian D. Sharp +12 more
TL;DR: This paper reports on the direct chemical modification of graphene by photopolymerization with styrene, and demonstrates an alternative route by which the surface reactivity can be precisely tuned, and these monomers can be locally grafted via electron-beam-induced carbon deposition on the graphene surface.
Journal ArticleDOI
Reduced Graphene Oxide/Copper Phthalocyanine Composite and Its Optoelectrical Properties
TL;DR: Reduced graphene oxide composites containing tetrasulfonate salt of copper phthalocyanine (TSCuPc) are fabricated through the reduction of graphene oxide in the presence of water-soluble TSCu....
References
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Journal ArticleDOI
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Andrea C. Ferrari,Jannik C. Meyer,Vittorio Scardaci,Cinzia Casiraghi,Michele Lazzeri,Francesco Mauri,S. Piscanec,Da Jiang,K. S. Novoselov,S. Roth,A. K. Geim +10 more
TL;DR: This work shows that graphene's electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers, and allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.
Journal ArticleDOI
Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
Sasha Stankovich,Dmitriy A. Dikin,Richard D. Piner,Kevin A. Kohlhaas,Alfred Kleinhammes,Yuanyuan Jia,Yue Wu,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
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