Graphane and hydrogenated graphene

Pumera, Martin; Wong, Chee How

doi:10.1039/c3cs60132c

Cited by 307 publications

(235 citation statements)

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“…Fourier transform infrared spectroscopy is also not suitable because of the black colour of the samples and the difficulty to prepare selfsupported wafers of sufficient transparency or reflectance. Overall, the hydrogen TPD measurements indicate that our samples do interact strongly with hydrogen, as it should be considering the abundant precedents in the formation of graphane from Gr materials that have been characterized mainly by the associated electrical conductivity decrease compared with Gr 33 . It is very likely, however, that the strongly bound hydrogen is not the one catalytically active in hydrogenation reactions and that only the fraction of the total chemisorbed hydrogen that is activated but loosely bound to Gr is the one that is mechanistically relevant.…”

Section: Resultsmentioning

confidence: 65%

Graphenes in the absence of metals as carbocatalysts for selective acetylene hydrogenation and alkene hydrogenation

et al. 2014

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Catalysis makes possible a chemical reaction by increasing the transformation rate. Hydrogenation of carbon-carbon multiple bonds is one of the most important examples of catalytic reactions. Currently, this type of reaction is carried out in petrochemistry at very large scale, using noble metals such as platinum and palladium or first row transition metals such as nickel. Catalysis is dominated by metals and in many cases by precious ones. Here we report that graphene (a single layer of one-atom-thick carbon atoms) can replace metals for hydrogenation of carbon-carbon multiple bonds. Besides alkene hydrogenation, we have shown that graphenes also exhibit high selectivity for the hydrogenation of acetylene in the presence of a large excess of ethylene.

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Section: Resultsmentioning

confidence: 65%

Graphenes in the absence of metals as carbocatalysts for selective acetylene hydrogenation and alkene hydrogenation

et al. 2014

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“…1 We calculated the formation energy of DB stanane by the difference between the total energy of DB stanane and the sum of the total energies of DB stanene and isolated hydrogen atoms. Such atomic hydrogen can be achieved in hydrogen plasma environment as used in hydrogenating graphene 38,39 . The formation energy is about -0.55 eV/atom.…”

Section: Resultsmentioning

confidence: 99%

Dumbbell stanane: a large-gap quantum spin hall insulator

Chen

Zhao

2015

Phys. Chem. Chem. Phys.

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Quantum spin Hall (QSH) effect is quite promising for applications in spintronics and quantum computations, but presently can only be achieved at ultralow temperature. Searching for large-gap QSH insulators is the key to increase the operating temperature. Using first-principles calculations, we demonstrate that the stable hydrogenated stanene with a dumbbell-like structure (DB stanane) has large topological nontrivial band gaps of 312 meV (Г point) and 160 meV for bulk characterized by a topological invariant of Z 2 =1, due to the s-p xy band inversion.Helical gapless edge states appear in the nanoribbon structures with high Fermi velocity comparable to that of graphene. The nontrivial topological states are robust against the substrate effects. The realization of this material is a feasible solution for applications of QSH effect at room temperature and beneficial to the fabrication of high-speed spintronics devices.

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“…7 However, there is still no method which results in full hydrogenation of graphene, i.e., graphane formation. 8 We have previously shown that plasma hydrogenation results in certain changes in the electronic structure, 9 work function, 10 and the adhesion properties of graphene. 11 In this work, we employ the ellipsometry technique and investigate the optical changes of graphene after treating it with hydrogen plasma.…”

mentioning

confidence: 99%

Spectroscopic ellipsometry on Si/SiO2/graphene tri-layer system exposed to downstream hydrogen plasma: Effects of hydrogenation and chemical sputtering

Eren

Marot

et al. 2015

Applied Physics Letters

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In this work, the optical response of graphene to hydrogen plasma treatment is investigated with spectroscopic ellipsometry measurements. Although the electronic transport properties and Raman spectrum of graphene change after plasma hydrogenation, ellipsometric parameters of the Si/SiO2/graphene tri-layer system do not change. This is attributed to plasma hydrogenated graphene still being electrically conductive, since the light absorption of conducting 2D materials does not depend on the electronic band structure. A change in the light transmission can only be observed when higher energy hydrogen ions (30 eV) are employed, which chemically sputter the graphene layer. An optical contrast is still apparent after sputtering due to the remaining traces of graphene and hydrocarbons on the surface. In brief, plasma treatment does not change the light transmission of graphene; and when it does, this is actually due to plasma damage rather than plasma hydrogenation.

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Graphane and hydrogenated graphene

Cited by 307 publications

References 50 publications

Graphenes in the absence of metals as carbocatalysts for selective acetylene hydrogenation and alkene hydrogenation

Graphenes in the absence of metals as carbocatalysts for selective acetylene hydrogenation and alkene hydrogenation

Dumbbell stanane: a large-gap quantum spin hall insulator

Spectroscopic ellipsometry on Si/SiO2/graphene tri-layer system exposed to downstream hydrogen plasma: Effects of hydrogenation and chemical sputtering

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