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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Epitaxial growth of large-area single-layer graphene over Cu(111)/sapphire by atmospheric pressure CVD
Baoshan Hu,Hiroki Ago,Yoshito Ito,Kenji Kawahara,Masaharu Tsuji,Eisuke Magome,Kazushi Sumitani,Noriaki Mizuta,Ken Ichi Ikeda,Seigi Mizuno +9 more
TL;DR: In this article, the atmospheric pressure chemical vapor deposition (CVD) growth of single-layer graphene over a crystalline Cu(1 1 1 ) film heteroepitaxially deposited on c -plane sapphire is reported.
Journal ArticleDOI
Mechanical and electrical properties of carbon fiber composites with incorporation of graphene nanoplatelets at the fiber–matrix interphase
TL;DR: In this article, carbon fibers were coated with graphene nanoplatelets (GnP) using a robust and continuous coating process, and the results showed an increase in mechanical properties and electrical conductivity of the composites.
Journal ArticleDOI
From graphite to graphene: direct liquid-phase exfoliation of graphite to produce single- and few-layered pristine graphene
TL;DR: In this article, the authors highlight the recent progress made on the exfoliation of bulky graphite powders or flakes into single and few-layered graphene sheets in various liquids, including organic solvents, ionic liquids, and water/surfactant solutions.
Journal ArticleDOI
Aqueous Only Route toward Graphene from Graphite Oxide
Ken-Hsuan Liao,Anudha Mittal,Shameek Bose,Chris Leighton,K. Andre Mkhoyan,Christopher W. Macosko +5 more
TL;DR: A new, simple, hydrazine-free, high-yield method for producing single-layer graphene sheets that appears to occur in large uniform interconnected oxygen-free patches so that despite the presence of residual oxygen the sp(2) carbon bonds formed on the sheets are sufficient to provide electronic properties comparable to reduced graphene sheets obtained using other methods.
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A review on inkjet printing of nanoparticle inks for flexible electronics
TL;DR: In this article, the authors have summarized the various aspects of inks such as fluid dynamical parameters of the inks, mechanism of the coffee ring formation, different types of ink preparation strategies and their applications in sensors, thin film transistors, and energy storage devices.
References
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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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