Hydrogenation of bilayer graphene: A small twist makes a big difference

Dong, Jichen; Zhang, Kaili; Ding, Feng

doi:10.1007/s12274-015-0888-6

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…Besides production of films, it can be used for transforming the structure of nanoclusters, as shown in the pressureless formation of nanodiamonds from amorphous carbon . Moreover, it seems also to allow transforming other, inorganic structures, e.g., the impact of active surface groups (atoms) triggers the connection of h-BN layers resulting in materials with unusual electronics. − On the other hand, the promise of the van der Waals heterostructures suggests possible synthesis of diamond/BN heterolattices. , The chemically induced phase transition of the growing number of atomic heterobilayers can become a tool for obtaining fully novel nanostructures, interlayer-bonded superlattices, including the domains in twisted bilayer graphene where diamane regions are periodically patterned in a graphene precursor ,,,− or lateral diamane heterostructures from connected F-diamane and H-diamane . Last but not leastand closing the loop “graphene-diamane-diamond”is the use of the large area diamane as a substrate for further CVD growth of bulk diamond.…”

Section: Discussionmentioning

confidence: 99%

Two-Dimensional Diamond—Diamane: Current State and Further Prospects

Сорокин

Yakobson

2021

Nano Lett.

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Two-dimensional diamond, or diamane, is an ultrathin film with unique physical properties that combine the record values of the bulk crystal with the exciting features caused by the nanoscale nature. At the current stage of research, the diamane properties are mostly studied theoretically, and the main experimental efforts are directed at its synthesis. The latter is the trickiest problem since traditional methods involving the application of high pressure are not fully suitable due to the influence of surface effects. For diamane research, this poses a number of challenges, whose description is the main purpose and scope of this review. The paper also discusses the progress made so far and outlines the prospects for this field, at the crossroads of the timeless diamond and decade-old graphene.

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Section: Discussionmentioning

confidence: 99%

Two-Dimensional Diamond—Diamane: Current State and Further Prospects

Сорокин

Yakobson

2021

Nano Lett.

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“…Given that HG is highly insulating and Gr is conductive, the electronic and van der Waals interactions between layers are starkly different, and yet the protective effect of an HG overlayer persists. In addition, as recent work has shown, , twisting the bilayer affects the system’s electronic structure and could feasibly have some effect on the chemistry of the material. The observations that hydrogenation is preserved on twisted bilayers as well as on HG or Gr are therefore an indication that the interlayer electronic and van der Waals interactions do not strongly dictate the protective effect of the second graphene layer.…”

Section: Discussionmentioning

confidence: 99%

Protection from Below: Stabilizing Hydrogenated Graphene Using Graphene Underlayers

2017

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We show that dehydrogenation of hydrogenated graphene proceeds much more slowly for bilayer systems than for single layer systems. We observe that an underlayer of either pristine or hydrogenated graphene will protect an overlayer of hydrogenated graphene against a number of chemical oxidants, thermal dehydrogenation, and degradation in an ambient environment over extended periods of time. Chemical protection depends on the ease of oxidant intercalation, with good intercalants such as Br demonstrating much higher reactivity than poor intercalants such as 1,2-dichloro-4,5-dicyanonbenzoquinone (DDQ). Additionally, the rate of dehydrogenation of hydrogenated graphene at 300 °C in H/Ar was reduced by a factor of roughly 10 in the presence of a protective underlayer of graphene or hydrogenated graphene. Finally, the slow dehydrogenation of hydrogenated graphene in air at room temperature, which is normally apparent after a week, could be completely eliminated in samples with protective underlayers over the course of 39 days. Such protection will be critical for ensuring the long-term stability of devices made from functionalized graphene.

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“…Typical types of point defects in TBG include vacancies of carbon atoms [27,28], Stone-Wales defects [29], and adsorption of atoms such as carbon, fluorine, and hydrogen on the surface of TBG [30][31][32]. Hydrogenation of TBG, in particular, distorts chemical bonds at the absorption sites [32], modifies the bandgap of the material [33], and induces magnetism in TBG [34,35]. Hydrogen atoms on the surface of TBG can form during the fabrication process such as the bottom-up synthesis of graphene from small hydrocarbon molecules.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of twisted bilayer graphene with magnetic defects

Natalin,

Kundelev,

Rukhlenko

et al. 2023

Electron. Struct.

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Even when fabricated under ideal conditions twisted bilayer graphene (TBG) inevitably contains various defects which may significantly affect its physical properties. Here we comprehensively analyse the impact of typical point defects, represented by adsorbed hydrogen atoms, on the electronic and optical properties of TBG. It is shown using self-consistent tight-binding Hamiltonians that such point defects make TBG ferromagnetic, and that its ground state comprises a pair of nearly dispersionless spin-polarized energy bands around the Fermi level. Transitions to and from these bands strongly modify the infrared absorption of TBG and result in a sharp low-energy peak in its spectrum. It is also revealed that the adsorption of hydrogen atoms suppresses the circular dichroism of TBG due to the weakening of the electronic coupling between the graphene layers. Our findings will guide future experimental studies on the optical properties of TBG in realistic, impurity-rich environments.

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Hydrogenation of bilayer graphene: A small twist makes a big difference

Cited by 8 publications

References 36 publications

Two-Dimensional Diamond—Diamane: Current State and Further Prospects

Two-Dimensional Diamond—Diamane: Current State and Further Prospects

Protection from Below: Stabilizing Hydrogenated Graphene Using Graphene Underlayers

Optical properties of twisted bilayer graphene with magnetic defects

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