電子束に敏感な結晶材料の原子解像度伝送電子顕微鏡
Daliang Zhang1, Yihan Zhu2, Lingmei Liu2
1King Abdullah University of Science and Technology (KAUST), Imaging and Characterization Core Lab, Thuwal 23955-6900, Saudi Arabia. daliang.zhang@kaust.edu.sa kun.li@kaust.edu.sa yu.han@kaust.edu.sa.
Science (New York, N.Y.)
|January 20, 2018
まとめ
高解像度トランスミッション電子顕微鏡 (TEM) で 繊細な素材を画像化するための 新しい方法を開発しました この技術は,電子束に敏感な金属有機フレームワークとペロブスキットで原子の詳細を成功裏に捕捉しました.
科学分野:
- 材料科学
- 電子顕微鏡
- ナノテクノロジー
背景:
- 伝送電子顕微鏡 (TEM) で電子束に敏感な材料のイメージングは大きな課題を提示しています.
- これらの課題には,低ビーム用量,迅速な結晶ゾーン軸の識別,正確な画像アラインメント,正確な失焦の決定が含まれます.
研究 の 目的:
- 電子ビームに敏感な材料の高解像度TEMイメージングのための方法のセットを開発し,実装する.
- メタル・オーガニック・フレームワーク (MOF) や他の繊細な材料の原子解像度画像を取得する.
主な方法:
- 低用量,高解像度のTEMイメージングのための専門技術の開発.
- ゾーン軸の迅速な発見,画像の整合,および非焦点測定の方法を実装する.
- これらの方法を様々な電子ビームに敏感なサンプルに適用する.
主要な成果:
- いくつかの金属有機フレームワーク (MOF) の原子解像度のTEM画像を取得しました.
- MOF構造内の個々の金属原子柱,表面端末,ベンゼンリングを特定した.
- ハイブリッド・ペロブスキート材料 (CH3NH3PbBr3) にも適用を拡大した.
結論:
- 開発された方法は,ビームに敏感な材料のTEMイメージングにおける主要な課題を克服します.
- 原子解像度の画像は,MOFやペロブスキートなどの繊細な材料で実現可能です.
- この進歩により 繊細なナノマテリアルの 詳細な構造分析が可能になります
関連する概念動画
01:15Transmission Electron Microscopy
7.3K
In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
7.3K
03:26Electron Configuration of Multielectron Atoms
65.4K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
65.4K
02:28Electronic Structure of Atoms
29.1K
An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
29.1K
01:24Electron Carriers
92.2K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
92.2K
03:07Electron Affinity
43.8K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
43.8K
00:54Electron Behavior
109.9K
Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
109.9K