High-Fidelity Conformation of Graphene to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Topographic Features

Cullen, William; Yamamoto, Mahito; Burson, Kristen M.; Chen, Jianhao; Jang, Chaun; Li, L.; Fuhrer, Michael S.; Williams, Ellen D.

doi:10.1103/physrevlett.105.215504

Cited by 126 publications

(107 citation statements)

References 23 publications

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“…The measured root-mean-square (RMS) surface roughness of graphene/SiO is 1.5 -5.0 Å (∼ 1.5 Å, 60 nm ×60 nm [56]; ∼ 1.5 Å, 30 nm ×30 nm [58]; ∼ 1.9 Å, 250 nm ×200 nm [161]; ∼ 5.0 Å, 10 nm ×10 nm [162]; ∼ 3.5 Å, 195 nm ×178 nm [164]; ∼ 2.2 Å, 100 nm ×100 nm [165]). In contrast, the RMS surface roughness of graphene/BN is 0.02-0.30 Å (0.02-0.17 Å, 20 nm ×20 nm [57]; ∼ 0.30 Å, 100 nm ×100 nm [165]).…”

Section: Graphene On Silicon Carbidementioning

confidence: 99%

“…High resolution STM images have been achieved for graphene on SiO [56,[161][162][163][164][165] as well as on BN [57,165]. The measured root-mean-square (RMS) surface roughness of graphene/SiO is 1.5 -5.0 Å (∼ 1.5 Å, 60 nm ×60 nm [56]; ∼ 1.5 Å, 30 nm ×30 nm [58]; ∼ 1.9 Å, 250 nm ×200 nm [161]; ∼ 5.0 Å, 10 nm ×10 nm [162]; ∼ 3.5 Å, 195 nm ×178 nm [164]; ∼ 2.2 Å, 100 nm ×100 nm [165]).…”

Section: Graphene On Silicon Carbidementioning

confidence: 99%

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Probing Electronic Properties of Graphene on the Atomic Scale by Scanning Tunneling Microscopy and Spectroscopy

Gao¹

2014

Graphene and 2D Materials

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Atomic scale investigations of the electronic properties of graphene are playing a crucial role in understanding and tuning the exotic properties of this material for its potential device applications. Scanning tunneling microscopy (STM) and spectroscopy (STS) are unique techniques for atomic scale investigations and have been extensively used in graphene research. In this article, we review recent progresses in STM and STS studies of the electronic properties of suspended graphene as well as graphene supported by di erent substrates including graphite, metals, silicon carbide, silicon dioxide and boron nitride.

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Section: Graphene On Silicon Carbidementioning

confidence: 99%

Section: Graphene On Silicon Carbidementioning

confidence: 99%

Probing Electronic Properties of Graphene on the Atomic Scale by Scanning Tunneling Microscopy and Spectroscopy

Gao¹

2014

Graphene and 2D Materials

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“…It is worth mentioning that irrespective of the surface type, values obtained for the adhesion energies are sufficiently exceeding the elastic energy stored in graphene (∼0.8-2.6 meV/C). 18,20 This means that the interaction energy between graphene and SiO 2 is large enough to overcome the energy needed for graphene to follow the SiO 2 morphology. Therefore, our results confirm previous estimations regarding the possibility of graphene-SiO 2 conformation.…”

Section: Graphene Adhesion On Sio2mentioning

confidence: 99%

“…As follows from experimental studies, the structure of graphene supported on amorphous SiO 2 is highly corrugated owing to highfidelity conformation. 17,18,20 The assumed invariability of graphene is resulting from the employed theoretical approach. Indeed, the supercell used in our study is too small in lateral directions to reveal corrugations of graphene caused by the irregularity of the substrate.…”

Section: B Geometry Of the Graphene-sio2 Interfacementioning

confidence: 99%

“…19 Furthermore, it has been shown that the adhesion of graphene on SiO 2 is essentially conformal, meaning that graphene reproduces the substrate topography with very high accuracy. 20 Apparently, interfacial interactions play a key role in the understanding of the structural behavior of graphene supported on surfaces. Nevertheless, the microscopic nature of the graphene adhesion on realistic SiO 2 has not yet been clearly established.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial interactions between local defects in amorphous SiO2and supported graphene

et al. 2011

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We present a density functional study of graphene adhesion on a realistic SiO2 surface taking into account van der Waals (vdW) interactions. The SiO2 substrate is modeled at the local scale by using two main types of surface defects, typical for amorphous silica: the oxygen dangling bond and three-coordinated silicon. The results show that the nature of adhesion between graphene and its substrate is qualitatively dependent on the surface defect type. In particular, the interaction between graphene and silicon-terminated SiO2 originates exclusively from the vdW interaction, whereas the oxygen-terminated surface provides additional ionic contribution to the binding arising from interfacial charge transfer (p-type doping of graphene). Strong doping contrast for the different surface terminations provides a mechanism for the charge inhomogeneity of graphene on amorphous SiO2 observed in experiments. We found that independent of the considered surface morphologies, the typical electronic structure of graphene in the vicinity of the Dirac point remains unaltered in contact with the SiO2 substrate, which points to the absence of the covalent interactions between graphene and amorphous silica. The case of hydrogen-passivated SiO2 surfaces is also examined. In this situation, the binding with graphene is practically independent of the type of surface defects and arises, as expected, from the vdW interactions. Finally, the interface distances obtained are shown to be in good agreement with recent experimental studies.

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Molecule‐Induced Conformational Change in Boron Nitride Nanosheets with Enhanced Surface Adsorption

Cai

Gao

et al. 2016

Adv Funct Materials

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Surface interaction is extremely important to both fundamental research and practical application. Physisorption can induce shape and structural distortion (i.e., conformational changes) in macromolecular and biomolecular adsorbates, but such phenomena have rarely been observed on adsorbents. Here, it is demonstrated theoretically and experimentally that atomically thin boron nitride (BN) nanosheets as an adsorbent experience conformational changes upon surface adsorption of molecules, increasing adsorption energy and efficiency. The study not only provides new perspectives on the strong adsorption capability of BN nanosheets and many other two‐dimensional (2D) nanomaterials but also opens up possibilities for many novel applications. For example, it is demonstrated that BN nanosheets with the same surface area as bulk hexagonal BN particles are more effective in purification and sensing.

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High-Fidelity Conformation of Graphene toSiO2Topographic Features

Cited by 126 publications

References 23 publications

Probing Electronic Properties of Graphene on the Atomic Scale by Scanning Tunneling Microscopy and Spectroscopy

Probing Electronic Properties of Graphene on the Atomic Scale by Scanning Tunneling Microscopy and Spectroscopy

Interfacial interactions between local defects in amorphous SiO2and supported graphene

Molecule‐Induced Conformational Change in Boron Nitride Nanosheets with Enhanced Surface Adsorption

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