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graphene

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Journal Article
Published: 01 July 2016
American Mineralogist (2016) 101 (7): 1668-1678.
... causes the black coloring. Raman spectra and X-ray photoelectron spectroscopy (XPS) results indicate structural disorder and chemical impurities within bonds (e.g., sp 3 hybridized carbon and C–O bonds) in the carbonaceous material, instead of perfectly structured graphite or graphene. Isolated graphene...
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Journal Article
Published: 01 April 2015
Mineralogical Magazine (2015) 79 (2): 337-344.
... method for production of single-atom-thick graphene, can be used for production of sheet-silicate specimens that are sufficiently thin to allow high-resolution transmission electron microscope (HRTEM) imaging to be achieved successfully while also being free from the specimen preparation artefacts...
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Schematic atomic model of ( A ) graphite, ( B ) <b>graphene</b>, ( C ) the C 60  m...
in > Elements
Published: 01 December 2014
F igure 1 Schematic atomic model of ( A ) graphite, ( B ) graphene, ( C ) the C 60 molecule (which resembles the seams of a soccerball), and ( D ) two different types of carbon nanotubes. The two tubes in panel D differ in the orientation of the carbon hexagon with respect to the tube axis.
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( A ) Exfoliation of <b>graphene</b> using Scotch tape. ( B ) Optical microscope i...
in > Elements
Published: 01 December 2014
F igure 3 ( A ) Exfoliation of graphene using Scotch tape. ( B ) Optical microscope image of graphene on a 285 nm thick SiO 2 substrate. Optical contrast with the pale mauve background can be used to single out the flakes containing one layer (1L) from those containing a few layers (2L, 3L, 4L
Journal Article
Published: 14 November 2018
Journal of the Geological Society (2018) 176 (2): 337-347.
... of as building blocks. Following a bottom-up approach, we show how graphene and diamond molecules are built up and how their properties vary with size, reaching an upper limit with bulk graphite and diamond. Carbon atoms with sp 2 hybridization give rise to an impressive number of different materials...
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Series: European Mineralogical Union Notes in Mineralogy
Published: 01 January 2011
DOI: 10.1180/EMU-notes.11.8
EISBN: 9780903056458
... interest. This interest extends to the special field of nanocomposites, and of graphene, which is also an intercalated layered structure. In general, any guest material inserted into an interlayer space causes a modification in the structure, with spacing-size changes in a particular crystallographic...
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( A ) Schematic diagram of <b>graphene&#x27;s</b> electronic bands near the Fermi level...
in > Elements
Published: 01 December 2014
F igure 4 ( A ) Schematic diagram of graphene's electronic bands near the Fermi level, ε F . The dependence of the energy, ε, of the π and π* bands on the momentum p (which is a two-dimensional vector) has a conic shape. ( B ) Number of electronic states available at a certain energy, ε
Journal Article
Published: 01 June 2016
European Journal of Mineralogy (2016) 28 (3): 545-554.
... of the graphene layers in natural nanostructured carbon and is in good agreement with the results of HRTEM. Disordered natural carbonaceous materials are one of the most controversial objects of mineralogy. These materials at a high degree of metamorphism have an almost pure carbon composition and a three...
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Journal Article
Journal: Elements
Published: 01 December 2014
Elements (2014) 10 (6): 447-452.
...F igure 1 Schematic atomic model of ( A ) graphite, ( B ) graphene, ( C ) the C 60 molecule (which resembles the seams of a soccerball), and ( D ) two different types of carbon nanotubes. The two tubes in panel D differ in the orientation of the carbon hexagon with respect to the tube axis. ...
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Journal Article
Published: 01 December 2013
European Journal of Mineralogy (2013) 25 (5): 835-843.
.... The microstructure of shungite affected by the most intense metamorphic transformation of all the analysed samples is characterized by hollow nanospheres with diameters of approximately 100 nm and a wall thickness of up to 10 nm (~ 30 graphene layers). The maximum degree of structural order in this shungite...
FIGURES
Series: European Mineralogical Union Notes in Mineralogy 14
Published: 01 January 2013
DOI: 10.1180/EMU-notes.14
EISBN: 9780903056380
Journal Article
Published: 01 October 2002
Mineralogical Magazine (2002) 66 (5): 709-732.
... are compared with those reported for graphene nanotubes. An example of ‘internal’ nucleation mediated by an aqueous solution is the nucleation of antigorite, the modulated variety of serpentine, inside carlosturanite grains (Fig. 5 ). The nucleation site corresponds to a polysomic defect of this phase...
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HRTEM images of shungite from Maxovo (a) and Nigozero (b). Crystallites wit...
Published: 01 June 2016
Fig. 6 HRTEM images of shungite from Maxovo (a) and Nigozero (b). Crystallites with (002) graphene planes of 0.34 nm distance are indicated by dashed circles.
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Schematic diagrams of the structures ( a – d ) and formation mechanisms ( 1...
Published: 01 July 2016
) The precipitates, which are mixtures of Mg-silicate layers and organic carbonaceous material, initially take the shape of ooids. ( 3 ) The ooids are buried and diagenesis facilitates the formation of black talc. ( a and b ) Monolayer and multilayers of graphene-like carbon in the interlayer positions of the talc
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Secondary electron images of cracked apatite surfaces illustrating shape an...
Published: 01 April 2017
of graphite inclusion composed by graphene stack.
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HRTEM images from Novaya Zemlya island anthraxolites: samples No. 8 from Pe...
Published: 01 June 2016
Fig. 7 HRTEM images from Novaya Zemlya island anthraxolites: samples No. 8 from Perya (a) and No. 10 from Yuzhnyi (b), showing small crystallites with (002) graphene planes of 0.34 nm distance in the non-ordered carbon structure.
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Schematic of the cone-helix model (modified after  Double &amp; Hellawell 1...
Published: 01 April 2007
F ig . 5. Schematic of the cone-helix model (modified after Double & Hellawell 1974 ) for a cone with an apex angle α = 127° resulting from an overlap angle θ = 60° – 21.8° = 38.2°, illustrating a moiré pattern from the lattice coincidences between adjacent layers of graphene.
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(a) TEM image of a graphite cone with a 60° apex angle and (b) associated e...
Published: 01 April 2007
F ig . 4. (a) TEM image of a graphite cone with a 60° apex angle and (b) associated electron-diffraction pattern from the center of the cone, indicating that the graphene sheets are aligned parallel to the conical surface. The surface of the cone is coated by an amorphous carbon layer several
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Calculated binding energy as a function of the H/C ratio for molecules with...
Published: 14 November 2018
and a graphene layer of c. 100 atoms. Modified after ( Badziag et al . 1990 ).
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High-magnification TEM images of graphite morphologies associated with magn...
Published: 01 July 2012
of 3.35 Å (between white arrows); red arrow indicates split graphite sheets to further accommodate graphene layers at fork. Scale bars: in a , 20 nm; in c , 6 nm; in d , 5 nm.