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相关概念视频

Energy Bands in Solids01:01

Energy Bands in Solids

739
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
739
Band Theory02:35

Band Theory

15.0K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
15.0K
Semiconductors01:22

Semiconductors

645
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
645
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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2D ψ-石墨烯材料的应变诱导带隙工程:一项第一原则研究

Kamal Kumar1, Nora H de Leeuw2,3, Jost Adam4,5

  • 1Department of Physics, Applied Science Cluster, School of Advanced Engineering, University of Petroleum and Energy Studies (UPES), Bidholi via Premnagar, Dehradun, Uttarakhand 248007, India.

Beilstein journal of nanotechnology
|November 27, 2024
PubMed
概括

应变工程可以调整像 ψ-石墨烯这样的新二维材料的电子特性. 这项研究表明,机械应变可以在原始和化 ψ-石墨烯中打开带隙,从而使电子和传感器的应用成为可能.

关键词:
两维材料是二维材料.在 DFT 方面,它是最重要的.缺陷 缺陷 缺陷 缺陷石墨烯是一种石墨烯.压力 压力 压力 压力ψ - 石墨烯的使用方法

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术 纳米技术

背景情况:

  • 二维 (2D) 材料具有独特的特性,但它们的金属性质限制了应用.
  • 应变工程是修改电子属性的关键方法,包括带隙调.
  • ψ-石墨烯是一种新型的二维碳基,其化形式 (ψ-石墨烯, ψ-石墨烯) 具有独特的电子特征.

研究的目的:

  • 研究在平面内和平面外双轴应变对原始和化 ψ-石墨烯的影响.
  • 确定这些材料的应变耐受性和带隙调制能力.
  • 根据它们的应变工程电子特性,探索潜在的应用.

主要方法:

  • 计算机建模模拟双轴应变 (在平面内和平面外) 的应用.
  • 对电子带结构的分析,以观察在不同应变水平下带隙的变化.
  • 对不同形式的 ψ-石墨烯的机械应变耐受性的表征.

主要成果:

  • 纯粹的ps-石墨烯在14%的内平面应变下表现出200meV的带隙开口.
  • 在低应变值 (+/-1%) 的情况下, ψ-图形电话从零带隙过渡到半导体状态.
  • 在施加的机械应变下, ψ-石墨烯保持其广泛的直接带隙半导体性质.

结论:

  • 机械应变有效调整 ψ-石墨烯及其化衍生物的电子特性.
  • 对应变化的独特反应为开发先进的电子和光电子设备提供了途径.
  • 纯质和ps-graphane具有显著的应变耐受性,适合强大的传感器和设备应用.