相关实验视频

Updated: Jun 22, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

通过电子辐射在hBN中创建单个空缺位置

Thuy An Bui¹, Gregor T Leuthner¹, Jacob Madsen¹

¹University of Vienna, Faculty of Physics, Boltzmanngasse 5, Vienna, 1090, Austria.

Small (Weinheim an der Bergstrasse, Germany)

|June 1, 2023

概括

六角化 (hBN) 的电子辐射显示,在较低的能量下,损伤率显著降低. 这项研究表明了使用电子束在hBN中进行受控单空缺陷工程的潜力.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
表面科学是一门学科.

背景情况:

电子辐射对于传输电子显微镜 (TEM) 和二维材料操纵至关重要.
了解六角化 (hBN) 的辐射效应对于其应用至关重要.

研究的目的:

用于测量单层hBN.的移位横截面.
为了研究hBN在低能量的电子辐射损伤机制.
探索hBN.中缺陷工程的潜力.

主要方法:

异常校正扫描传输电子显微镜 (STEM).
实验在接近超高真空的环境中进行.
主光束能量在50到90keV之间.
使用电荷受约束密度函数理论的理论建模分子动力学.

主要成果:

80keV以下的损坏率明显低于之前报告的 (高达三次数).
单个空缺可以通过电子辐射在hBN中创建.
原子被射出的频率几乎是原子的两倍,低于80 keV.
观察到的低能损伤并不能仅仅通过弹性敲击来解释.

结论:

不弹性散射和价值离子化在降低位移值能量方面发挥着作用.
在单空水平上对hBN的缺陷工程是可行的,使用电子辐射.
对于对缺陷形成的定量预测,还需要进一步的理论改进.

关键词:

六角性的化.扫描传输电子显微镜扫描传输电子显微镜超高真空超高真空超高真空

更多相关视频

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

Published on: March 29, 2016

Sample Preparation and Experimental Design for In Situ Multi-Beam Transmission Electron Microscopy Irradiation Experiments

Sample Preparation and Experimental Design for In Situ Multi-Beam Transmission Electron Microscopy Irradiation Experiments

Published on: June 27, 2022

相关概念视频

Nuclear Overhauser Enhancement (NOE)

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...