scholarly journals High-energy exciton transitions in quasi-two-dimensional cadmium chalcogenide nanoplatelets

2017 ◽  
Vol 95 (16) ◽  
Author(s):  
Roman B. Vasiliev ◽  
Alexander I. Lebedev ◽  
Elizabeth P. Lazareva ◽  
Natalia N. Shlenskaya ◽  
Vladimir B. Zaytsev ◽  
...  
Keyword(s):  
High Energy ◽  
Two Dimensional ◽  
Cadmium Chalcogenide ◽  
Exciton Transitions

Parabolas from Reconstructed Surfaces Observed in Convergent-Beam RHEED Patterns

1990 ◽  
Vol 48 (2) ◽  
pp. 398-399
Author(s):  
M. Gajdardziska-Josifovska
Keyword(s):  
Electron Microscopy ◽  
High Energy ◽  
Two Dimensional ◽  
High Energy Electron ◽  
Reflection And Transmission ◽  
Experimental Diffraction Pattern ◽  
Surface Resonance ◽  
Reconstructed Surfaces ◽  
Reflection Electron Microscopy ◽  
Convergent Beam

Parabolas have been observed in the reflection high-energy electron diffraction (RHEED) patterns from surfaces of single crystals since the early thirties. In the last decade there has been a revival of attempts to elucidate the origin of these surface parabolas. The renewed interest stems from the need to understand the connection between the parabolas and the surface resonance (channeling) condition, the latter being routinely used to obtain higher intensity in reflection electron microscopy (REM) images of surfaces. Several rather diverging descriptions have been proposed to explain the parabolas in the reflection and transmission Kikuchi patterns. Recently we have developed an unifying general treatment in which the parabolas are shown to be K-lines of two-dimensional lattices. Here we want to review the main features of this description and present an experimental diffraction pattern from a 30° MgO (111) surface which displays parabolas that can be attributed to the surface reconstruction.

scholarly journals Two-dimensional SnO2 anchored biomass-derived carbon nanosheet anode for high-performance Li-ion capacitors

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10018-10026
Author(s):  
Chang Liu ◽  
Zeyin He ◽  
Jianmin Niu ◽  
Qiang Cheng ◽  
Zongchen Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Lithium Ion ◽  
High Energy ◽  
Good Combination ◽  
Two Dimensional ◽  
Power Characteristics ◽  
Coffee Grounds ◽  
Lithium Ion Capacitor ◽  
Li Ion

In this work, we have fabricated lithium-ion capacitor using SnO2/PCN as anode and waste coffee grounds derived PCN as cathode, which delivers good combination of high energy and power characteristics.

Graphene's Correlation of Electrical and Magnetic Properties Manages the Modification and Increasing the Energy of Li Batteries

2021 ◽  
Vol 105 (1) ◽  
pp. 247-258
Author(s):  
Serhii Dubinevych ◽  
Viacheslav Zinin ◽  
Volodymyr Redko ◽  
Boris A Blyuss ◽  
Elena Shembel ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Nobel Prize ◽  
Lithium Batteries ◽  
Lithium Ion ◽  
High Energy ◽  
Two Dimensional ◽  
Power Sources ◽  
Electrical And Magnetic Properties ◽  
Nobel Prize In Physics ◽  
Li Batteries

Importance of lithium power sources is confirmed by the fact that on October 10, 2019, the Nobel Prize in Chemistry in 2019 was awarded for the development of lithium-ion batteries. 10 years earlier, in 2010,physicists Andre Geim and Kostya Novoselov were awarded the Nobel Prize in Physics "For groundbreaking experiments regarding the two dimensional material graphene". A synergistic effect of theory and practicality in the area of lithium batteries, and the theory and practicality in the field of graphene materials creates the unique possibility generate the innovative high-energy Li batteries based on the graphene materials.

A RHEED Study of MBE Growth of ZnSe on GaAs (111) A-(2 × 2)

2003 ◽  
Vol 10 (04) ◽  
pp. 669-675
Author(s):  
F. S. Gard ◽  
J. D. Riley ◽  
R. Leckey ◽  
B. F. Usher
Keyword(s):  
Growth Rate ◽  
Electron Diffraction ◽  
Substrate Temperature ◽  
Three Dimensional ◽  
High Energy ◽  
Growth Mode ◽  
Two Dimensional ◽  
High Energy Electron ◽  
Mbe Growth ◽  
Atomic Flux

ZnSe epilayers have been grown under various Se/Zn atomic flux ratios in the range of 0.22–2.45 at a substrate temperature of 350°C on Zn pre-exposed GaAs (111) A surfaces. Real time reflection high energy electron diffraction (RHEED) observations have shown a transition from a two-dimensional (2D) to a three-dimensional (3D) growth mode. The transition time depends directly upon the growth rate. A detailed discussion is presented to explore the cause of this change in the growth mode.

scholarly journals Two-dimensional inorganic molecular crystals

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Wei Han ◽  
Pu Huang ◽  
Liang Li ◽  
Fakun Wang ◽  
Peng Luo ◽  
...  
Keyword(s):  
Organic Molecules ◽  
Electronic Devices ◽  
Molecular Crystals ◽  
High Energy ◽  
Two Dimensional ◽  
Β Phase ◽  
Α Phase ◽  
Growth Plane ◽  
Transmission Electron

Abstract Two-dimensional molecular crystals, consisting of zero-dimensional molecules, are very appealing due to their novel physical properties. However, they are mostly limited to organic molecules. The synthesis of inorganic version of two-dimensional molecular crystals is still a challenge due to the difficulties in controlling the crystal phase and growth plane. Here, we design a passivator-assisted vapor deposition method for the growth of two-dimensional Sb2O3 inorganic molecular crystals as thin as monolayer. The passivator can prevent the heterophase nucleation and suppress the growth of low-energy planes, and enable the molecule-by-molecule lateral growth along high-energy planes. Using Raman spectroscopy and in situ transmission electron microscopy, we show that the insulating α-phase of Sb2O3 flakes can be transformed into semiconducting β-phase under heat and electron-beam irradiation. Our findings can be extended to the controlled growth of other two-dimensional inorganic molecular crystals and open up opportunities for potential molecular electronic devices.

Different void fluctuation in ring-like events and jet-like events in 16O–AgBr interactions at 60 AGeV

2014 ◽  
Vol 23 (11) ◽  
pp. 1450067 ◽  
Author(s):  
M. Mondal ◽  
S. Biswas Ghosh ◽  
A. Mondal ◽  
D. Ghosh ◽  
A. Deb
Keyword(s):  
Phase Transition ◽  
Production Process ◽  
Dimensional Analysis ◽  
High Energy ◽  
Two Dimensional ◽  
Hadron Phase ◽  
High Energy Collisions ◽  
Two Parameters

This paper reports a study of fluctuations and possible signature of quark–hadron phase transition in high energy collisions. The study is based on the ring-like and jet-like events for pions produced in 16 O – AgBr interactions at 60 AGeV. We have performed two-dimensional analysis (η-φ space) of fluctuation of voids for two types of azimuthal substructures of produced pions (ring-like and jet-like) following connecting void approach given by R. C. Hwa and Q. H. Zhang. The values of two parameters "c" and "s" reveal different void pattern fluctuation in ring-like and jet-like events, which hints toward different mechanism in their production process.

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