Preparation of graphene bilayers on platinum by sequential chemical vapour deposition

Halle, Johannes; Mehler, Alexander; Néel, N.

doi:10.1039/c8cp07569g

Cited by 12 publications

(9 citation statements)

References 42 publications

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“…Most likely, these structures are due to residual intercalated Pt atoms or clusters. Importantly, in agreement with previous reports [ 30,39,41,46 ] a moiré pattern is absent from the lower right part of the STM image, which strongly hints at graphene rather than h‐BN as the imaged 2D material because h‐BN‐covered Pt(111) gives rise to a clearly discernible moiré lattice (see Figure , Supporting Information). Indeed, the absence of a moiré pattern is consistent with the weak graphene–Pt(111) hybridization [ 47 ] and large twist angles enclosed by the close‐packed lattice direction of graphene,

{⟨11 \bar{2} 0⟩}_{normalG}

, and Pt(111),

(⟨⟩, 1 \overset{1}{true} 0)

, [ 39,46 ] as inferred from the atomically resolved graphene (Figure 2) and Pt(111) (see Figure , Supporting Information) lattices.…”

Section: Resultssupporting

confidence: 91%

“…In the work presented here the fabrication of graphene atop h‐BN on Pt(111) on the basis of the thermal decomposition of molecular precursors and the catalytic assistance of the metal substrate is reported, which so far has successfully been applied to the growth of bilayer graphene. [ 30 ] The combination of STM and density functional calculations shows that the resulting moiré pattern of the graphene–h‐BN stacking is due to the h‐BN–Pt(111) interface. At small probe–surface distances, STM images show that the graphene–h‐BN heterostructure in addition to the moiré lattice exhibits a honeycomb superstructure.…”

Section: Introductionmentioning

confidence: 99%

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Second Floor of Flatland: Epitaxial Growth of Graphene on Hexagonal Boron Nitride

Mehler

Néel

Voloshina

et al. 2021

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In the studies presented here, the subsequent growth of graphene on hexagonal boron nitride (h‐BN) is achieved by the thermal decomposition of molecular precursors and the catalytic assistance of metal substrates. The epitaxial growth of h‐BN on Pt(111) is followed by the deposition of a temporary Pt film that acts as a catalyst for the fabrication of the graphene sheet. After intercalation of the intermediate Pt film underneath the boron‐nitride mesh, graphene resides on top of h‐BN. Scanning tunneling microscopy and density functional calculations reveal that the moiré pattern of the van‐der‐Waals‐coupled double layer is due to the interface of h‐BN and Pt(111). While on Pt(111) the graphene honeycomb unit cells uniformly appear as depressions using a clean metal tip for imaging, on h‐BN they are arranged in a honeycomb lattice where six protruding unit cells enframe a topographically dark cell. This superstructure is most clearly observed at small probe–surface distances. Spatially resolved inelastic electron tunneling spectroscopy enables the detection of a previously predicted acoustic hybrid phonon of the stacked materials. Its’ spectroscopic signature is visible in surface regions where the single graphene sheet on Pt(111) transitions into the top layer of the stacking.

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{⟨11 \bar{2} 0⟩}_{normalG}

, and Pt(111),

(⟨⟩, 1 \overset{1}{true} 0)

, [ 39,46 ] as inferred from the atomically resolved graphene (Figure 2) and Pt(111) (see Figure , Supporting Information) lattices.…”

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Second Floor of Flatland: Epitaxial Growth of Graphene on Hexagonal Boron Nitride

Mehler

Néel

Voloshina

et al. 2021

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“…Combining segregation of C impurities and thermal decomposition of hydrocarbon molecules has enabled the preparation of graphene stackings with a controlled number of layers. [ 58 ]…”

Section: Methodsmentioning

confidence: 99%

Local Probes of Graphene Lattice Dynamics

2020

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Inelastic electron tunneling spectroscopy with a scanning tunneling microscope is a powerful method to excite and detect vibrational quanta with atomic resolution. The focus of this review article is on the local spectroscopy of graphene phonons. The experimental observation of their spectroscopic signatures together with theoretical modeling highlight the importance of the graphene–surface as well as the graphene–tip hybridization, the electron–phonon coupling strength, phonon‐mediated tunneling, local doping profiles, and the phonon density of state for the measured signal. Meanwhile, a comprehensive understanding of the underlying mechanisms has been attained and justifies an overview on available findings.

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“…Various transition metals like Pt, Ni, Au, and Cu have been examined as a catalyst for synthesizing BLG by CVD method [22][23][24][25] . Among them, Cu has been most widely used because it follows a surface-mediated growth mechanism that allows atomic-scale control on the BLG synthesis [26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Specific stacking angles of bilayer graphene grown on atomic-flat and -stepped Cu surfaces

Cho¹,

Park²,

Kim³

et al. 2020

npj 2D Mater Appl

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Bilayer graphene (BLG) exhibits unique properties depending on a stacking angle between the two layers of graphene. Although it has been known that BLGs having stacking angles of 0° and 30° can be obtained by chemical vapor deposition (CVD), not much is known yet about the effect of copper (Cu) surface on the decision of stacking angle, through which further fine control of the stacking angle could be possible. Here, we report that the crystal plane of Cu catalyst plays a critical role in the selection of the stacking angle of BLG, and provide experimental and computational evidence that an atomic-flat Cu (111) surface generates BLGs having 0° and 30° of stacking angle, while atomic-stepped Cu (311) and Cu (110) surfaces mainly produce small stacking angle BLGs with 3–5° of stacking angle as a major product by CVD.

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Preparation of graphene bilayers on platinum by sequential chemical vapour deposition

Cited by 12 publications

References 42 publications

Second Floor of Flatland: Epitaxial Growth of Graphene on Hexagonal Boron Nitride

Second Floor of Flatland: Epitaxial Growth of Graphene on Hexagonal Boron Nitride

Local Probes of Graphene Lattice Dynamics

Specific stacking angles of bilayer graphene grown on atomic-flat and -stepped Cu surfaces

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