Multilayer graphene sunk growth on Cu(111) surface

Dai, Xinyue; Mitchell, Izaac; Kim, Sungkyun; An, Hao; Xu, Ziwei

doi:10.1016/j.carbon.2022.07.064

Cited by 11 publications

(15 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For one thing, the use of it as a substrate might overcome the challenge of preparing 2D materials with large scale and high quality because it can meet the following three conditions as a valuable substrate: (1) it should be low-cost enough; (2) it should possess high temperature resistance; and (3) its surface structure should be fairly stable in air and have an inherent hexagonal character like most 2D materials. This has been experimentally confirmed in several 2D materials such as graphene and MoS 2 [ 20 , 21 , 22 , 23 , 24 ]. In addition, although it is easy to obtain ideal 2D materials, superstructure and regular line defects are frequently observed in the surfaces of 2D materials, and their formation mechanisms are still poorly understood [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 66%

Study of the Cu(111) Surface by Scanning Tunneling Microscopy: The Morphology Evolution, Reconstructions, Superstructures and Line Defects

Wang

Shen

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

The Cu(111) surface is an important substrate for catalysis and the growth of 2D materials, but a comprehensive understanding of the preparation and formation of well-ordered and atomically clean Cu(111) surfaces is still lacking. In this work, the morphology and structure changes of the Cu(111) surface after treatment by ion bombardment and annealing with a temperature range of 300–720 °C are investigated systematically by using in situ low-temperature scanning tunneling microscopy. With the increase of annealing temperature, the surface morphology changes from corrugation to straight edge, the number of screw dislocations changes from none to numerous, and the surface atomic structure changes from disordered to ordered structures (with many reconstructions). In addition, the changing trend of step width and step height in different stages is different (first increased and then decreased). A perfect Cu(111) surface with a step height of one atom layer (0.21 nm) and a width of more than 150 nm was obtained. In addition, two interesting superstructures and a new surface phase with a large number of line defects were found. This work serves as a strong foundation for understanding the properties of Cu(111) surface, and it also provides important guidance for the effective pretreatment of Cu(111) substrates, which are widely used.

show abstract

Section: Introductionmentioning

confidence: 66%

Study of the Cu(111) Surface by Scanning Tunneling Microscopy: The Morphology Evolution, Reconstructions, Superstructures and Line Defects

Wang

Shen

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Their detailed synthesis protocol along with the scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy, and photoluminescence (PL) characterization can be found elsewhere (also, see Methods section). Figure a shows a plan-view SEM image of a trilayer graphene island where the second (2L) and third (3L) graphene layers form underneath the first grown graphene layer (1L) during the CVD process, thus forming the so-called “inverted wedding cake” structure. ,− As seen from Figure a, there is a grain boundary going through the second layer of graphene, indicated by a dashed red line. This is evident from two observations.…”

Section: Resultsmentioning

confidence: 99%

Role of Bilayer Graphene Microstructure on the Nucleation of WSe₂ Overlayers

et al. 2023

View full text Add to dashboard Cite

Over the past few years, graphene grown by chemical vapor deposition (CVD) has gained prominence as a template to grow transition metal dichalcogenide (TMD) overlayers. The resulting two-dimensional (2D) TMD/graphene vertical heterostructures are attractive for optoelectronic and energy applications. However, the effects of the microstructural heterogeneities of graphene grown by CVD on the growth of the TMD overlayers are relatively unknown. Here, we present a detailed investigation of how the stacking order and twist angle of CVD graphene influence the nucleation of WSe2 triangular crystals. Through the combination of experiments and theory, we correlate the presence of interlayer dislocations in bilayer graphene with how WSe2 nucleates, in agreement with the observation of a higher nucleation density of WSe2 on top of Bernal-stacked bilayer graphene versus twisted bilayer graphene. Scanning/transmission electron microscopy (S/TEM) data show that interlayer dislocations are present only in Bernal-stacked bilayer graphene but not in twisted bilayer graphene. Atomistic ReaxFF reactive force field molecular dynamics simulations reveal that strain relaxation promotes the formation of these interlayer dislocations with localized buckling in Bernal-stacked bilayer graphene, whereas the strain becomes distributed in twisted bilayer graphene. Furthermore, these localized buckles in graphene are predicted to serve as thermodynamically favorable sites for binding WSe x molecules, leading to the higher nucleation density of WSe2 on Bernal-stacked graphene. Overall, this study explores synthesis–structure correlations in the WSe2/graphene vertical heterostructure system toward the site-selective synthesis of TMDs by controlling the structural attributes of the graphene substrate.

show abstract

“…In a real experiment, a chosen MG with the interlayer distance increased to 7.85 Å will be unstable as it tends to become MG with an interlayer distance 3.34 Å [ 58 , 59 ]. However, in real experiments, other clusters and molecules can be absorbed by graphene, which can affect the interlayer distance.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of Graphene Networks under Compression: A Molecular Dynamics Simulation

Polyakova

Baimova

2023

IJMS

View full text Add to dashboard Cite

Molecular dynamics simulation is used to study and compare the mechanical properties obtained from compression and tension numerical tests of multilayered graphene with an increased interlayer distance. The multilayer graphene with an interlayer distance two-times larger than in graphite is studied first under biaxial compression and then under uniaxial tension along three different axes. The mechanical properties, e.g., the tensile strength and ductility as well as the deformation characteristics due to graphene layer stacking, are studied. The results show that the mechanical properties along different directions are significantly distinguished. Two competitive mechanisms are found both for the compression and tension of multilayer graphene—the crumpling of graphene layers increases the stresses, while the sliding of graphene layers through the surface-to-surface connection lowers it. Multilayer graphene after biaxial compression can sustain high tensile stresses combined with high plasticity. The main outcome of the study of such complex architecture is an important step towards the design of advanced carbon nanomaterials with improved mechanical properties.

show abstract

Multilayer graphene sunk growth on Cu(111) surface

Cited by 11 publications

References 56 publications

Study of the Cu(111) Surface by Scanning Tunneling Microscopy: The Morphology Evolution, Reconstructions, Superstructures and Line Defects

Study of the Cu(111) Surface by Scanning Tunneling Microscopy: The Morphology Evolution, Reconstructions, Superstructures and Line Defects

Role of Bilayer Graphene Microstructure on the Nucleation of WSe₂ Overlayers

Mechanical Properties of Graphene Networks under Compression: A Molecular Dynamics Simulation

Contact Info

Product

Resources

About

Multilayer graphene sunk growth on Cu(111) surface

Cited by 11 publications

References 56 publications

Study of the Cu(111) Surface by Scanning Tunneling Microscopy: The Morphology Evolution, Reconstructions, Superstructures and Line Defects

Study of the Cu(111) Surface by Scanning Tunneling Microscopy: The Morphology Evolution, Reconstructions, Superstructures and Line Defects

Role of Bilayer Graphene Microstructure on the Nucleation of WSe2 Overlayers

Mechanical Properties of Graphene Networks under Compression: A Molecular Dynamics Simulation

Contact Info

Product

Resources

About

Role of Bilayer Graphene Microstructure on the Nucleation of WSe₂ Overlayers