Surface reactivity and vacancy defects in single-layer borophene polymorphs

2017 ◽  
Vol 19 (18) ◽  
pp. 11273-11281 ◽  
Author(s):  
Vadym V. Kulish
Keyword(s):  
Systematic Study ◽  
Single Layer ◽  
Surface Reactivity ◽  
Vacancy Defects

We present a systematic study on the surface reactivity of single-layer borophene polymorphs.

scholarly journals Millisecond lattice gasification for high-density CO2- and O2-sieving nanopores in single-layer graphene

2021 ◽  
Vol 7 (9) ◽  
pp. eabf0116
Author(s):  
Shiqi Huang ◽  
Shaoxian Li ◽  
Luis Francisco Villalobos ◽  
Mostapha Dakhchoune ◽  
Marina Micari ◽  
...  
Keyword(s):  
Single Layer ◽  
High Density ◽  
Single Layer Graphene ◽  
Pore Density ◽  
Vacancy Defects ◽  
Carbon Gasification ◽  
Layer Graphene ◽  
Gas Molecules ◽  
Good Agreement

Etching single-layer graphene to incorporate a high pore density with sub-angstrom precision in molecular differentiation is critical to realize the promising high-flux separation of similar-sized gas molecules, e.g., CO2 from N2. However, rapid etching kinetics needed to achieve the high pore density is challenging to control for such precision. Here, we report a millisecond carbon gasification chemistry incorporating high density (>1012 cm−2) of functional oxygen clusters that then evolve in CO2-sieving vacancy defects under controlled and predictable gasification conditions. A statistical distribution of nanopore lattice isomers is observed, in good agreement with the theoretical solution to the isomer cataloging problem. The gasification technique is scalable, and a centimeter-scale membrane is demonstrated. Last, molecular cutoff could be adjusted by 0.1 Å by in situ expansion of the vacancy defects in an O2 atmosphere. Large CO2 and O2 permeances (>10,000 and 1000 GPU, respectively) are demonstrated accompanying attractive CO2/N2 and O2/N2 selectivities.

Thermal conductivity of two-dimensional BC3: a comparative study with two-dimensional C3N

2019 ◽  
Vol 21 (24) ◽  
pp. 12977-12985 ◽  
Author(s):  
Jieren Song ◽  
Zhonghai Xu ◽  
Xiaodong He ◽  
Yujiao Bai ◽  
Linlin Miao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Comparative Study ◽  
Molecular Dynamics Simulations ◽  
Environmental Temperature ◽  
Single Layer ◽  
Two Dimensional ◽  
Vacancy Defects ◽  
Dynamics Simulations ◽  
External Strain

The thermal conductivities of single-layer BC3 (SLBC) sheets and their responses to environmental temperature, vacancy defects and external strain have been studied and compared with those of single-layer C3N (SLCN) sheets by molecular dynamics simulations.

Schottky barrier tuning of the single-layer MoS2 on magnetic metal substrates through vacancy defects and hydrogenation

2016 ◽  
Vol 18 (45) ◽  
pp. 31027-31032 ◽  
Author(s):  
Won Seok Yun ◽  
J. D. Lee
Keyword(s):  
Schottky Barrier ◽  
Single Layer ◽  
Metal Substrates ◽  
Vacancy Defects ◽  
Magnetic Metal ◽  
Atomic Vacancy

The Schottky barrier and magnetism of the single-layer MoS2 on magnetic metal substrates can be tuned by atomic vacancy defects and hydrogenation.

scholarly journals Bottom-up synthesis of graphene films hosting atom-thick molecular-sieving apertures

2021 ◽  
Vol 118 (37) ◽  
pp. e2022201118 ◽  
Author(s):  
Luis Francisco Villalobos ◽  
Cédric Van Goethem ◽  
Kuang-Jung Hsu ◽  
Shaoxian Li ◽  
Mina Moradi ◽  
...  
Keyword(s):  
High Performance ◽  
State Of The Art ◽  
Scale Up ◽  
Single Layer ◽  
Chemical Vapor ◽  
Single Layer Graphene ◽  
Bottom Up ◽  
Vacancy Defects ◽  
Graphene Lattice ◽  
Molecular Sieving

Incorporation of a high density of molecular-sieving nanopores in the graphene lattice by the bottom-up synthesis is highly attractive for high-performance membranes. Herein, we achieve this by a controlled synthesis of nanocrystalline graphene where incomplete growth of a few nanometer-sized, misoriented grains generates molecular-sized pores in the lattice. The density of pores is comparable to that obtained by the state-of-the-art postsynthetic etching (1012 cm−2) and is up to two orders of magnitude higher than that of molecular-sieving intrinsic vacancy defects in single-layer graphene (SLG) prepared by chemical vapor deposition. The porous nanocrystalline graphene (PNG) films are synthesized by precipitation of C dissolved in the Ni matrix where the C concentration is regulated by controlled pyrolysis of precursors (polymers and/or sugar). The PNG film is made of few-layered graphene except near the grain edge where the grains taper down to a single layer and eventually terminate into vacancy defects at a node where three or more grains meet. This unique nanostructure is highly attractive for the membranes because the layered domains improve the mechanical robustness of the film while the atom-thick molecular-sized apertures allow the realization of large gas transport. The combination of gas permeance and gas pair selectivity is comparable to that from the nanoporous SLG membranes prepared by state-of-the-art postsynthetic lattice etching. Overall, the method reported here improves the scale-up potential of graphene membranes by cutting down the processing steps.

Imaging Vacancy Defects in Single-Layer Chromium Triiodide

2021 ◽  
Vol 12 (9) ◽  
pp. 2199-2205
Author(s):  
Jihai Zhang ◽  
Yu Guo ◽  
Peigen Li ◽  
Jun Wang ◽  
Si Zhou ◽  
...  
Keyword(s):  
Single Layer ◽  
Vacancy Defects

Adsorption of metal adatoms on single-layer phosphorene

2015 ◽  
Vol 17 (2) ◽  
pp. 992-1000 ◽  
Author(s):  
Vadym V. Kulish ◽  
Oleksandr I. Malyi ◽  
Clas Persson ◽  
Ping Wu
Keyword(s):  
First Principles ◽  
Single Layer ◽  
Surface Reactivity ◽  
First Principles Study

We present a first-principles study on the surface reactivity of single-layer phosphorene.

XXIV.—The Scattering of Light

1914 ◽  
Vol 33 ◽  
pp. 264-281
Author(s):  
James Robert Milne
Keyword(s):  
Light Scattering ◽  
Systematic Study ◽  
Ground Surface ◽  
Single Layer ◽  
The Other ◽  
Total Emission ◽  
Special Apparatus ◽  
The Many ◽  
The One ◽  
Made In

SummaryThe present paper describes a number of experiments made in connection with Christiansen's experiment in which a beam of light is passed through a transparent insoluble powder immersed in a liquid, with the result that light of the particular colour for which the indices of powder and liquid are the same passes unaffected, while light of all other colours is scattered. In this communication only the simplest case of the above is dealt with, that, namely, in which a flat piece of glass, ground on one side, takes the place of the powder, the rugosities of the ground surface representing a single layer of grains, and air takes the place of the liquid. In such a case there is, of course, no colour of light for which the indices of solid and liquid are alike, and indeed it was found that the colour of the light made very little difference to the results. On the other hand, however, it soon became apparent that different ways of grinding the glass surface led to very different effects. Accordingly, as no previous work appears to have been done in this field, and as it seemed a promising one, it was decided to make a systematic study of the various cases. Each specimen of glass employed was photomicrographed, and had its polar light distribution measured by a photometer. Two methods of characterising the particular scattering power of a screen soon suggested themselves and have been formally defined—the one connected with the Angle of Maximum Total Emission, and the other with the Equivalent Cavity.It is hoped to continue the investigation not only on the above lines, but also in the direction of ascertaining the effect of a number of plates, i.e. of successive layers of light-scattering particles; and in investigating the polarisation effects, which some rough preliminary experiments have shown to be marked.I am glad of this opportunity of acknowledging the help I have received from the Trustees of the Carnegie Trust in the form of grants for the construction of the special apparatus necessary; and desire to tender my grateful thanks to Professor MacGregor for the many facilities for carrying on the work which he kindly placed at my disposal.

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