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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Colloidal Synthesis of 1T-WS2 and 2H-WS2 Nanosheets: Applications for Photocatalytic Hydrogen Evolution
TL;DR: The development of synthetic protocols for producing colloidal WS2 monolayers, presenting not only the usual semiconducting prismatic 2H-WS2 structure but also the less common distorted octahedral 1T- WS2 structure, which exhibits metallic behavior.
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Solvent exfoliation of transition metal dichalcogenides: dispersibility of exfoliated nanosheets varies only weakly between compounds.
Graeme Cunningham,Mustafa Lotya,Clotilde S. Cucinotta,Stefano Sanvito,Shane D. Bergin,Robert Menzel,Milo S. P. Shaffer,Jonathan N. Coleman +7 more
TL;DR: This work shows that solution thermodynamics and specifically solubility parameter analysis can be used as a framework to understand the dispersion of two-dimensional materials.
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Sensitive electromechanical sensors using viscoelastic graphene-polymer nanocomposites
Conor S. Boland,Umar Khan,Gavin Ryan,Sebastian Barwich,Romina Charifou,Andrew Harvey,Claudia Backes,Zheling Li,Mauro S. Ferreira,Matthias E. Möbius,Robert J. Young,Jonathan N. Coleman +11 more
TL;DR: By considering both the connectivity and mobility of the nanosheets, a quantitative model is developed that completely describes the electromechanical properties of graphene, allowing the manufacture of strain sensors that can detect respiration and the footsteps of spiders.
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Graphene Oxide: Structural Analysis and Application as a Highly Transparent Support for Electron Microscopy
Neil R. Wilson,Priyanka A. Pandey,Richard Beanland,Robert J. Young,Ian A. Kinloch,Lei Gong,Zheng Liu,Kazu Suenaga,Jonathan P. Rourke,Stephen J. York,Jeremy Sloan +10 more
TL;DR: Electron diffraction shows that on average the underlying carbon lattice maintains the order and lattice-spacings of graphene; a structure that is clearly resolved in 80 kV aberration-corrected atomic resolution TEM images.
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Graphene: Promises, Facts, Opportunities, and Challenges in Nanomedicine
Hongying Mao,Sophie Laurent,Wei Chen,Omid Akhavan,Mohammad Imani,Ali Akbar Ashkarran,Morteza Mahmoudi +6 more
TL;DR: Nanomedicine Hong Ying Mao,† Sophie Laurent,‡ Wei Chen,*,†,§ Omid Akhavan, Mohammad Imani, Ali Akbar Ashkarran, and Morteza Mahmoudi.
References
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Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
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