相关实验视频
Updated: Jan 23, 2026

09:51
Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
Published on: April 22, 2013
13.3K
用电子/离子成像和原子探头断层扫描对纳米颗粒进行多模性特征的尖端聚合方法
Aristide Djoulde1, Anup Sharma1,2, Alfred Bekoe Appiagyei3
1Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria, 3800, Australia.
Small methods
|May 26, 2025
概括
一种新的"针眼"技术精确地将纳米粒子定位为先进显微镜. 这种方法使得单个和聚类纳米粒子的详细结构和化学分析具有前所未有的分辨率.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 分析化学 分析化学
背景情况:
- 相对显微镜需要精确的样本操纵进行多模式分析.
- 分析纳米粒子结构和化学存在重大挑战.
- 现有的纳米粒子制备方法往往复杂且耗时.
研究的目的:
- 为纳米粒子探索引入一种新的"针眼"方法.
- 克服纳米颗粒的多模和相关显微镜的局限性.
- 为了使纳米粒子的高分辨率结构和化学成像.
主要方法:
- 在针尖上制造"针眼"微通道,使用聚焦离子束 (FIB) 研磨和等离子处理.
- 通过压力梯度将纳米颗粒限制在微通道内.
- 在现场聚合和塑造纳米粒子样本成各种几何形状 (微柱状,状,纳米针状) 使用FIB.
- 使用能量分散式X射线光谱 (EDX),FIB二次离子质谱 (FIB-SIMS), (扫描) 传输电子显微镜 ((S) TEM) 和原子探头断层扫描 (APT) 的表征.
主要成果:
- 使用混合金属氧化物催化剂证明"针眼"方法的适用性.
- 成功完成了多模式分析,结合了相关和互补的高分辨率结构和化学成像.
- 验证该方法分析单个和聚类纳米粒子的能力.
- 在针头尖端有效地限制picoliter规模的样品 (6-60 pL).
结论:
- "针眼"方法为纳米粒子分析提供了一种简化方法.
- 这种技术消除了提升和微切割的需要,简化了样品的准备.
- 通过高空间分辨率的结合显微镜技术实现纳米粒子的全面分析.
相关概念视频
Electron Configuration of Multielectron Atoms
64.6K
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...
64.6K
Atomic Structure
207.6K
Overview
207.6K
Ions and Ionic Charges
78.7K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
78.7K
Electronic Structure of Atoms
28.2K
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...
28.2K
Atomic Absorption Spectroscopy: Atomization Methods
1.5K
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
1.5K
Atomic Orbitals
43.4K
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
43.4K

