相关实验视频
Updated: Jun 14, 2025
10:44
Preparation of Carbon Nanosheets at Room Temperature
Published on: March 8, 2016
12.1K
无形碳化物薄膜:表面和地表组成和结合
Josef Zemek1, Jana Houdkova1, Petr Jiricek1
1Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic.
Langmuir : the ACS journal of surfaces and colloids
|August 30, 2024
概括
角分辨率的X射线光电子光谱显示无形碳化物薄膜组成和粘合的显著变化. 表面层与深层不同,影响与周围环境的相互作用,包括生物组织.
科学领域:
- 材料科学 材料科学 材料科学
- 表面科学是一门学科.
- 纳米技术 纳米技术
背景情况:
- 了解无形碳化物 (DLC:N) 薄膜的表面和地下成分对于预测它们的相互作用至关重要.
- 脉冲激光沉积 (PLD) 是一种常见的方法,用于创建类似钻石的碳 (DLC) 薄膜,通常用进行修改.
- 需要非破坏性分析技术来探测这些复杂的材料,而不改变它们的结构.
研究的目的:
- 量化确定空气暴露无形碳化物薄膜的组成和原子结合.
- 为了研究从表面到浅层地下区域的非破坏性,深度变化.
- 为了将这些变化与材料的特性和与周围环境的相互作用相关联.
主要方法:
- 角分辨率X射线光电子谱学 (ARXPS) 的应用.
- 使用最大的方法进行数据分析.
- 通过脉冲激光沉积沉积和离子轰炸修饰的无形碳化物薄膜的分析.
主要成果:
- 从顶部表面到浅层地下 (∼1 nm) 观察到构成,化学结合和质量密度的显著变化.
- 顶部的1nm层富含氧气,气,气,以及主要是sp2混合碳.
- 较深的区域显示了sp3混合碳的增加,的减少到最低,其次是和,具有明显的三角形和四角形碳分布.
结论:
- DLC:N膜的表面特性受到表面附近大量的sp2结合碳的显著影响.
- 这些发现为DLC:N层表面相互作用提供了更深入的理解,这与涉及生物组织的应用相关.
- 该研究强调了深度分辨率分析对于描述复杂薄膜的重要性.
相关概念视频
02:18Network Covalent Solids
13.4K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.4K
01:28Structures of Carboxylic Acid Derivatives
2.4K
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
2.4K