Hydrogen interaction with graphene on Ir(1 1 1): a combined intercalation and functionalization study

Balog, Richard; Cassidy, Andrew; Jørgensen, Jakob Holm; Kyhl, Line; Andersen, Mie; Čabo, Antonija Grubišić; Ravani, Foteini; Bignardi, Luca; Lacovig, Paolo; Lizzit, Silvano; Hornekær, Liv

doi:10.1088/1361-648x/aaf76b

Cited by 7 publications

(5 citation statements)

References 45 publications

(67 reference statements)

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“…Second, the graphene-substrate interaction is relatively weak such that the graphene π-band is almost intact [7,8]. Actually, the electronic structure, which presents mini gaps and replica bands, can be tuned and chemically decoupled from the substrate by intercalation [9][10][11][12]. In this scenario, an atomic level structural characterisation of graphene grown on iridium (Gr/Ir) is fundamentally important to understand its electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Selecting ‘convenient observers’ to probe the atomic structure of CVD graphene on Ir(111) via photoelectron diffraction

Barreto

Lima

Martins

et al. 2020

J. Phys.: Condens. Matter

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CVD graphene grown on metallic substrates presents, in several cases, a long-range periodic structure due to a lattice mismatch between the graphene and the substrate. For instance, graphene grown on Ir(111), displays a corrugated supercell with distinct adsorption sites due to a variation of its local electronic structure. This type of surface reconstruction represents a challenging problem for a detailed atomic surface structure determination for experimental and theoretical techniques. In this work, we revisited the surface structure determination of graphene on Ir(111) by using the unique advantage of surface and chemical selectivity of synchrotron-based photoelectron diffraction. We take advantage of the Ir 4f photoemission surface state and use its diffraction signal as a probe to investigate the atomic arrangement of the graphene topping layer. We determine the average height and the overall corrugation of the graphene layer, which are respectively equal to 3.40 ± 0.11 Å and 0.45 ± 0.03 Å. Furthermore, we explore the graphene topography in the vicinity of its high-symmetry adsorption sites and show that the experimental data can be described by three reduced systems simplifying the moiré supercell multiple scattering analysis.

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Section: Introductionmentioning

confidence: 99%

Selecting ‘convenient observers’ to probe the atomic structure of CVD graphene on Ir(111) via photoelectron diffraction

Barreto

Lima

Martins

et al. 2020

J. Phys.: Condens. Matter

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“…[6] One-thirdhydrogenated graphene (OTHG) has also been fabricated and found to exhibit anisotropic electronic properties. [7] By now, a large assortment of hydrogenated forms of graphene (HGr) with different carbon-to-hydrogen (C/H) ratios have been predicted [2,5,8] or fabricated [7,[9][10][11][12][13][14][15][16][17][18][19][20] . It has been found that the C/H ratio can be used to tune the band gap.…”

Section: Introductionmentioning

confidence: 99%

“…[7] By now, a large assortment of hydrogenated forms of graphene (HGr) with different carbon-to-hydrogen (C/H) ratios have been predicted [2,5,8] or fabricated. [7,[9][10][11][12][13][14][15][16][17][18][19][20] It has been found that the C/H ratio can be used to tune the bandgap. [9,17,21] Giant local enhancement of spin-orbit coupling has been predicted [22] and demonstrated when introducing small amounts, ≈0.01-0.05%, of hydrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

Intrinsically Honeycomb‐Patterned Hydrogenated Graphene

Song

Qian

Lei

et al. 2021

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Since the advent of graphene ushered the era of 2D materials, many forms of hydrogenated graphene have been reported, exhibiting diverse properties ranging from a tunable bandgap to ferromagnetic ordering. Patterned hydrogenated graphene with micron‐scale patterns has been fabricated by lithographic means. Here, successful millimeter‐scale synthesis of an intrinsically honeycomb‐patterned form of hydrogenated graphene on Ru(0001) by epitaxial growth followed by hydrogenation is reported. Combining scanning tunneling microscopy observations with density‐functional‐theory (DFT) calculations, it is revealed that an atomic‐hydrogen layer intercalates between graphene and Ru(0001). The result is a hydrogen honeycomb structure that serves as a template for the final hydrogenation, which converts the graphene into graphane only over the template, yielding honeycomb‐patterned hydrogenated graphene (HPHG). In effect, HPHG is a form of patterned graphane. DFT calculations find that the unhydrogenated graphene regions embedded in the patterned graphane exhibit spin‐polarized edge states. This type of growth mechanism provides a new pathway for the fabrication of intrinsically patterned graphene‐based materials.

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“…Hydrogenated Gr has been synthesized and studied in several systems by controlled atomic H (H at ) exposure of single crystal surfaces [10][11][12]. For other 2D materials such as h-BN [13][14][15][16], borophene [6] and MoSe 2 [17] the reactivity towards H at has been investigated only very recently.…”

Section: Introductionmentioning

confidence: 99%

Easy hydrogenation and dehydrogenation of a hybrid graphene and hexagonal boron nitride monolayer on platinum

Píš¹,

Nappini²,

Panahi

et al. 2021

2D Mater.

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Understanding the fundamental steps of adsorption and controlled release of hydrogen in two-dimensional (2D) materials is of relevance for applications in nanoelectronics requiring tuning the physical properties or functionalization of the material, hydrogen storage and environmental sensors. Most applications demand that hydrogen adsorption and desorption can be controlled at room temperature. Here we report an element-specific study on the hydrogenation and dehydrogenation, in a low coverage regime, of a quasi-free standing 2D heterostructure (h-BNG) in the form of coexisting lateral domains of isostructural hexagonal boron nitride (h-BN) and graphene (Gr) on Pt(111). At very low hydrogen coverage a selective and partial hydrogenation of the Gr domains is observed in h-BNG. At the same time no changes are detected in the h-BN domains, indicating a preferential hydrogenation of Gr rather than h-BN domains. At higher coverage, hydrogenation of both Gr and h-BN domains is detected. A thermally facile hydrogen release from h-BN domains near room temperature is observed. Furthermore, the hybrid h-BNG 2D heterostructure enables also a much easier H2 thermal release from Gr domains when compared with a full Gr monolayer grown on the same Pt(111) substrate. These results suggest that the presence of coexisting hydrogenated h-BN domains could destabilize C–H bonds in Gr.

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Hydrogen interaction with graphene on Ir(1 1 1): a combined intercalation and functionalization study

Cited by 7 publications

References 45 publications

Selecting ‘convenient observers’ to probe the atomic structure of CVD graphene on Ir(111) via photoelectron diffraction

Selecting ‘convenient observers’ to probe the atomic structure of CVD graphene on Ir(111) via photoelectron diffraction

Intrinsically Honeycomb‐Patterned Hydrogenated Graphene

Easy hydrogenation and dehydrogenation of a hybrid graphene and hexagonal boron nitride monolayer on platinum

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