Coupling Epitaxy, Chemical Bonding, and Work Function at the Local Scale in Transition Metal-Supported Graphene

Wang, Bo; Caffio, Marco; Bromley, Catherine J.; Früchtl, Herbert; Schaub, Renald

doi:10.1021/nn101520k

Cited by 148 publications

(177 citation statements)

References 53 publications

Supporting

Mentioning

164

Contrasting

Order By: Relevance

“…We focus on metal contact and consider the situation where a metallic CNT or graphene is deposited (or epitaxially grown) on metal surfaces. Electronic and morphological properties of these interfaces have been issues of interest and a number of theoretical and experimental investigations have been made for both CNTs [8][9][10][11][12][13][14][15][16][17][18][19][20][21] and graphene 5,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] on metal surfaces. Earlier investigations for graphene on metals are reviewed in Refs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transfer doping of a metallic carbon nanotube and graphene on metal surfaces

Hasegawa

Nishidate

2011

Phys. Rev. B

View full text Add to dashboard Cite

In this paper we show the results of systematic investigations for the electronic-structure modifications of an armchair (10,10) single-walled carbon nanotube (SWNT) and graphene adsorbed on metal surfaces. The first-principles calculations based on the density-functional theory (DFT) were used to investigate transfer doping of these nanomaterials adsorbed on the fcc (111) surfaces of Al, noble metals (Ag, Cu, and Au), and transition metals (Rh, Pd, Ir, and Pt). We confirmed that the SWNT weakly interacts with the surfaces of Al and the noble metals (physisorption), while it strongly bonds to the transition-metal surfaces (chemisorption). The graphene adsorption on these metal surfaces is reinvestigated and found to be similar except for the Ir and Pt substrates, for which the interaction is weak as in the case of Al and the noble metal substrates. A phenomenological model is also developed on the basis of the rigid-band picture appropriate to physisorption. This model provides a relation between the Fermi-level shift and work-function difference and can conveniently be used in interpreting the DFT results for the transfer doping of both a SWNT and graphene on metal surfaces. We also identify the effect of hybridization between the graphene π orbitals and metallic valence states on the Fermi-level shift and find that the hybridization induces an extra downward shift of the linear-dispersion bands near the Dirac point relative to the other bands.

show abstract

Section: Introductionmentioning

confidence: 99%

“…5,22, and 23 and some of the more recent ones are given in Refs. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Electronic structures of metallic armchair CNTs and graphene are similar in that both have energy bands with linear dispersion crossing at a point in the one-and two-dimensional Brillouin zones.…”

Section: Introductionmentioning

confidence: 99%

Transfer doping of a metallic carbon nanotube and graphene on metal surfaces

Hasegawa

Nishidate

2011

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…1b. For monolayer graphene on a Rh(111) surface, the lattice mismatch between graphene (0.246 nm) and Rh(111) (0.269 nm) leads to hexagonal moiré superstructures with the expected periodicity approximately about 2.9 nm resulted from a 12C/11Rh coincidence lattice [39][40][41] ( Supplementary Fig. S1, the characteristic of the moiré superstructures is distinct from that shown in Fig.…”

Section: Resultsmentioning

confidence: 95%

Strain and curvature induced evolution of electronic band structures in twisted graphene bilayer

et al. 2013

View full text Add to dashboard Cite

It is well established that strain and geometry could affect the band structure of graphene monolayer dramatically. Here we study the evolution of local electronic properties of a twisted graphene bilayer induced by a strain and a high curvature, which are found to strongly affect the local band structures of the twisted graphene bilayer. The energy difference of the two low-energy van Hove singularities decreases with increasing lattice deformation and the states condensed into well-defined pseudo-Landau levels, which mimic the quantization of massive chiral fermions in a magnetic field of about 100 T, along a graphene wrinkle. The joint effect of strain and out-of-plane distortion in the graphene wrinkle also results in a valley polarization with a significant gap. These results suggest that strained graphene bilayer could be an ideal platform to realize the high-temperature zero-field quantum valley Hall effect.

show abstract

“…The interaction strength varies widely from the strong coupling with Rh [17,18] and Ru [19] to the weak limit (Ir [20], Pt [21]), where G retains its unique electronic properties [22]. The different lattice parameters of G and the metal underneath are accommodated through the formation of commensurate structures known as moiré patterns, where C atoms become inequivalent due to their different bonding configuration with the metal.…”

mentioning

confidence: 99%

Atomic-Scale Variations of the Mechanical Response of 2D Materials Detected by Noncontact Atomic Force Microscopy

et al. 2016

View full text Add to dashboard Cite

We show that noncontact atomic force microscopy (AFM) is sensitive to the local stiffness in the atomicscale limit on weakly coupled 2D materials, as graphene on metals. Our large amplitude AFM topography and dissipation images under ultrahigh vacuum and low temperature resolve the atomic and moiré patterns in graphene on Pt(111), despite its extremely low geometric corrugation. The imaging mechanisms are identified with a multiscale model based on density-functional theory calculations, where the energy cost of global and local deformations of graphene competes with short-range chemical and long-range van der Waals interactions. Atomic contrast is related with short-range tip-sample interactions, while the dissipation can be understood in terms of global deformations in the weakly coupled graphene layer. Remarkably, the observed moiré modulation is linked with the subtle variations of the local interplanar graphene-substrate interaction, opening a new route to explore the local mechanical properties of 2D materials at the atomic scale. DOI: 10.1103/PhysRevLett.116.245502 Atomic force microscopy (AFM) and scanning tunneling microscopy (STM) are tools of choice for characterizing the unique mechanical and electronic properties of graphene (G) and other 2D materials. Dynamic AFM [1] in the frequency modulation (FM) mode [2] has resolved the true geometric structure of a broad range of materials [3][4][5]. FM AFM experiments on carbon-based materials [6][7][8][9][10][11][12][13] show atomic contrast in Δf images and, depending on the setup, in the dissipation channel. While the origin of the dissipation is not well understood, the Δf contrast has been linked with the nature of the tip-sample interaction [14].G properties can be efficiently tuned by the interaction with metals [15,16]. The interaction strength varies widely from the strong coupling with Rh [17,18] and Ru [19] to the weak limit (Ir [20], Pt [21]), where G retains its unique electronic properties [22]. The different lattice parameters of G and the metal underneath are accommodated through the formation of commensurate structures known as moiré patterns, where C atoms become inequivalent due to their different bonding configuration with the metal. The resulting "true" topographic corrugation of G-the difference in height among the topmost and the bottom C atom-varies widely, even in the weakly interacting cases, where it ranges from ≈50 pm on Ir [23,24] to practically flat (≤ 3 pm) on Pt [21].While STM can easily resolve these moiré patterns, even in the G=Pt case [21,25], AFM experiments have only been reported in highly corrugated cases as Ru [26], Rh [27], and Ir [12,28]. Focusing on the most challenging case, G=Ir, experiments with a Kolibri sensor using a W tip clearly resolved the moiré in constant height (CH) AFM images [28]. Measurements with a tuning fork using both inert (CO-terminated) and reactive (Ir-terminated) tips [12] were able to identify the atoms with both tips at any tip-sample distance. This atomic-scale resolution allowed the ...

show abstract

Coupling Epitaxy, Chemical Bonding, and Work Function at the Local Scale in Transition Metal-Supported Graphene

Cited by 148 publications

References 53 publications

Transfer doping of a metallic carbon nanotube and graphene on metal surfaces

Transfer doping of a metallic carbon nanotube and graphene on metal surfaces

Strain and curvature induced evolution of electronic band structures in twisted graphene bilayer

Atomic-Scale Variations of the Mechanical Response of 2D Materials Detected by Noncontact Atomic Force Microscopy

Contact Info

Product

Resources

About