Selective growth of monolayer and bilayer graphene patterns by a rapid growth method

Nanoscale ◽  
2019 ◽  
Vol 11 (14) ◽  
pp. 6727-6736 ◽  
Author(s):  
Maddumage Don Sandeepa Lakshad Wimalananda ◽  
Jae-Kwan Kim ◽  
Ji-Myon Lee
Keyword(s):  
Surface Treatment ◽  
Rapid Growth ◽  
Bilayer Graphene ◽  
Selective Growth ◽  
Catalytic Surface ◽  
Graphene Layers ◽  
Plasma Treatments ◽  
Growth Method

Selective surface treatment of a catalytic surface by different plasma treatments to control the number of graphene layers.

Zinc oxide formation in galvanized metallic wire by simple selective growth method

2015 ◽  
Vol 82 ◽  
pp. 327-335 ◽  
Author(s):  
Sivanantham A. ◽  
Abinaya C. ◽  
Vishnukanthan V. ◽  
Jayabal P. ◽  
Boobalan K. ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Selective Growth ◽  
Oxide Formation ◽  
Metallic Wire ◽  
Growth Method

scholarly journals Quasicrystalline 30° twisted bilayer graphene as an incommensurate superlattice with strong interlayer coupling

2018 ◽  
Vol 115 (27) ◽  
pp. 6928-6933 ◽  
Author(s):  
Wei Yao ◽  
Eryin Wang ◽  
Changhua Bao ◽  
Yiou Zhang ◽  
Kenan Zhang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Graphene Layer ◽  
Rotational Symmetry ◽  
Reciprocal Lattice ◽  
Double Resonance ◽  
Interlayer Coupling ◽  
Bilayer Graphene ◽  
Lattice Vector ◽  
Graphene Layers ◽  
Twisted Bilayer Graphene

The interlayer coupling can be used to engineer the electronic structure of van der Waals heterostructures (superlattices) to obtain properties that are not possible in a single material. So far research in heterostructures has been focused on commensurate superlattices with a long-ranged Moiré period. Incommensurate heterostructures with rotational symmetry but not translational symmetry (in analogy to quasicrystals) are not only rare in nature, but also the interlayer interaction has often been assumed to be negligible due to the lack of phase coherence. Here we report the successful growth of quasicrystalline 30° twisted bilayer graphene (30°-tBLG), which is stabilized by the Pt(111) substrate, and reveal its electronic structure. The 30°-tBLG is confirmed by low energy electron diffraction and the intervalley double-resonance Raman mode at 1383 cm−1. Moreover, the emergence of mirrored Dirac cones inside the Brillouin zone of each graphene layer and a gap opening at the zone boundary suggest that these two graphene layers are coupled via a generalized Umklapp scattering mechanism—that is, scattering of a Dirac cone in one graphene layer by the reciprocal lattice vector of the other graphene layer. Our work highlights the important role of interlayer coupling in incommensurate quasicrystalline superlattices, thereby extending band structure engineering to incommensurate superstructures.

Maskless Selective Growth Method for p–n Junction Applications on (001)-Oriented Diamond

2012 ◽  
Vol 51 ◽  
pp. 090118 ◽  
Author(s):  
Hiromitsu Kato ◽  
Toshiharu Makino ◽  
Masahiko Ogura ◽  
Daisuke Takeuchi ◽  
Satoshi Yamasaki
Keyword(s):  
Selective Growth ◽  
Growth Method

scholarly journals Influence of Low-Pressure Plasma on the Surface Properties of CAD-CAM Leucite-Reinforced Feldspar and Resin Matrix Ceramics

2020 ◽  
Vol 10 (24) ◽  
pp. 8856
Author(s):  
Pablo Sevilla ◽  
Carlos Lopez-Suarez ◽  
Jesús Pelaez ◽  
Celia Tobar ◽  
Veronica Rodriguez-Alonso ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Plasma Treatment ◽  
Surface Properties ◽  
Ceramic Materials ◽  
Low Pressure ◽  
Resin Matrix ◽  
Ceramic Surface ◽  
Pressure Plasma ◽  
Plasma Treatments ◽  
Low Pressure Plasma

The introduction of new ceramic materials for dental restorations is currently a reality; however, little information is available on their surface treatment for the bonding process. Furthermore, surface treatment with plasma on ceramic materials has been recently introduced, although not many studies are available. The aim of this study was to evaluate the surface properties of a leucite-reinforced feldspar ceramic (LIC) and resin matrix ceramic (RMC) after low-pressure plasma treatment. From each material, 48 discs were prepared and subject to surface treatment. The LIC group was treated by hydrofluoric acid (HF) (LIC-HF), plasma with oxygen (LIC-O2), and plasma with argon (LIC-Ar). The RMC group was treated by sandblasting with alumina (RMC-SB), plasma with oxygen (RMC-O2), and plasma with argon (RMC-Ar). The groups whose surfaces were not subjected to treatment were considered as the control group. Surface wettability and roughness was analyzed. The results showed significant differences among the treatments for both ceramics regarding wettability and roughness. Plasma treatments increased the wettability and had a very low effect on the roughness. Plasma treatments achieved similar values for both surface properties in each ceramic group with no differences between both treatments. Plasma treatment seems to be a promising alternative for ceramic surface treatments since it increased the surface energy of the ceramics analyzed and hardly affects the roughness. Further studies are necessary to evaluate the effect of plasma treatment on the bond strength of ceramics.

Electronic and optical properties of monolayer and bilayer graphene

2010 ◽  
Vol 368 (1932) ◽  
pp. 5445-5458 ◽  
Author(s):  
Y. H. Ho ◽  
J. Y. Wu ◽  
Y. H. Chiu ◽  
J. Wang ◽  
M. F. Lin
Keyword(s):  
Optical Properties ◽  
Bilayer Graphene ◽  
Landau Levels ◽  
Optical Measurements ◽  
Monolayer Graphene ◽  
Zero Field ◽  
Electronic And Optical Properties ◽  
Graphene Layers ◽  
Lower Pair ◽  
Dependent Absorption

The electronic and optical properties of monolayer and bilayer graphene are investigated to verify the effects of interlayer interactions and external magnetic field. Monolayer graphene exhibits linear bands in the low-energy region. Then the interlayer interactions in bilayers change these bands into two pairs of parabolic bands, where the lower pair is slightly overlapped and the occupied states are asymmetric with respect to the unoccupied ones. The characteristics of zero-field electronic structures are directly reflected in the Landau levels. In monolayer and bilayer graphene, these levels can be classified into one and two groups, respectively. With respect to the optical transitions between the Landau levels, bilayer graphene possesses much richer spectral features in comparison with monolayers, such as four kinds of absorption channels and double-peaked absorption lines. The explicit wave functions can further elucidate the frequency-dependent absorption rates and the complex optical selection rules. These numerical calculations would be useful in identifying the optical measurements on graphene layers.

Quality of KDP crystals grown on point seeds by a novel rapid growth method

2008 ◽  
Vol 44 (8) ◽  
pp. 870-875
Author(s):  
E. L. Kim ◽  
V. I. Katsman ◽  
V. V. Vorontsov ◽  
V. N. Portnov ◽  
V. N. Trushin ◽  
...  
Keyword(s):  
Rapid Growth ◽  
Growth Method ◽  
Kdp Crystals

Effects of Surface Treatment on the Performance of PEDOT: PSS/n-GaN Schottky Solar Cells

2014 ◽  
Vol 492 ◽  
pp. 331-334
Author(s):  
Qian Feng ◽  
Kai Du ◽  
Yu Kun Li ◽  
Peng Shi ◽  
Qing Feng
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Surface Treatment ◽  
Ideality Factor ◽  
Oxygen Plasma ◽  
Schottky Contact ◽  
Schottky Contacts ◽  
Electrical Performance ◽  
Contact Material ◽  
Plasma Treatments

We developed heterojunction-based Schottky solar cells consisting of π-conjugated polymers and n-type GaN. PEDOT: PSS was used as the transparent Schottky contact material. In order to improve the performance of solar cells, the effects of surface treatment on the electrical performance of PEDOT: PSS/n-GaN Schottky contacts were investigated. The Voc increased from 0.52V to 0.62V,0.54V and 0.54V and Isc from 0.33 mA/cm2 to 0.45mA/cm2,0.40mA/cm2 and 0.35mA/cm2 after HCl, HF solution and oxygen plasma treatments. The I-V and the XPS measurements indicated that the barrier height of PEDOT:PSS/n-GaN was increased from 0.62eV to 0.76eV, 0.72eV and 0.70eV and the ideality factor improved from 1.81 to 1.63, 1.67 and 1.73 respectively, which induced the variation of the solar cells characteristics..

Controllable poly-crystalline bilayered and multilayered graphene film growth by reciprocal chemical vapor deposition

Nanoscale ◽  
2015 ◽  
Vol 7 (23) ◽  
pp. 10357-10361 ◽  
Author(s):  
Qinke Wu ◽  
Seong Jun Jung ◽  
Sung Kyu Jang ◽  
Joohyun Lee ◽  
Insu Jeon ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Film Growth ◽  
Graphene Film ◽  
Chemical Vapor ◽  
Bilayer Graphene ◽  
Selective Growth ◽  
Layer Graphene

We report the selective growth of multi-layer graphene or a bilayer graphene film by reciprocal chemical vapor deposition.

scholarly journals Fabrication of Molecular Crystal Nanostructures by a Selective Growth Method.

Hyomen Kagaku ◽  
1998 ◽  
Vol 19 (1) ◽  
pp. 14-20 ◽  
Author(s):  
Keiji UENO ◽  
Toshihiro SHIMADA ◽  
Atsushi KOMA
Keyword(s):  
Molecular Crystal ◽  
Selective Growth ◽  
Growth Method

scholarly journals Moire Is Different

2021 ◽  
Vol 13 (1) ◽  
pp. 50
Author(s):  
Wenyuan Shi
Keyword(s):  
Electronic Structures ◽  
Tight Binding ◽  
Physical Property ◽  
Large Change ◽  
Bilayer Graphene ◽  
Dirac Fermion ◽  
Dirac Fermions ◽  
Graphene Layers ◽  
Flat Bands ◽  
Twisted Bilayer Graphene

Graphene, as the thinnest material ever found, exhibits unconventionally relativistic behaviour of Dirac fermions. However, unusual phenomena (such as superconductivity) arise when stacking two graphene layers and twisting the bilayer graphene. The relativistic Dirac fermion in graphene has been widely studied and understood, but the large change observed in twisted bilayer graphene (TBG) is intriguing and still unclear because only van der Waals force (vdW) interlayer interaction is added from graphene to TBG and such a very weak interaction is expected to play a negligible role. To understand such dramatic variation, we studied the electronic structures of monolayer, bilayer and twisted bilayer graphene. Twisted bilayer graphene creates different moiré patterns when turned at different angles. We proposed tight-binding and effective continuum models and thereby drafted a computer code to calculate their electronic structures. Our calculated results show that the electronic structure of twisted bilayer graphene changes significantly even by a tiny twist. When bilayer graphene is twisted at special “magic angles”, flat bands appear. We examined how these flat bands are created, their properties and the relevance to some unconventional physical property such as superconductivity. We conclude that in the nanoscopic scale, similar looking atomic structures can create vastly different electronic structures. Like how P. W. Anderson stated that similar looking fields in science can have differences in his article “More is Different”, similar moiré patterns in twisted bilayer graphene can produce different electronic structures.

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