在有机-无机界面上,结合几何和带间状态之间的相关性:Catechol on rutile TiO2
Shao-Chun Li1, Jian-guo Wang, Peter Jacobson
1Department of Physics, Tulane University, New Orleans, Louisiana 70118, USA.
Journal of the American Chemical Society
|January 7, 2009
概括
在二氧化 (TiO2) 中,吸附剂诱导的带隙状态对于增强光吸收至关重要. 结合几何学决定了分子电子结构,只有双酸甲基醇在TiO(2) 带间隙中引入状态.
科学领域:
- 表面科学是一门学科.
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 半导体中的吸附剂诱导的带隙状态增强光吸收和光反应性.
- 了解半导体表面上的分子相互作用是控制电子属性的关键.
研究的目的:
- 研究分子级因素,控制二氧化 (TiO2) 中空隙状态的形成.
- 作为研究吸附剂-表面相互作用的模型系统,使用基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基
- 确定结合几何学对分子电子结构和带间隙状态的影响.
主要方法:
- 结合了理论计算和实验技术.
- 扫描道显微镜 (STM) 用于结构分析.
- 光辐射光谱仪用于电子结构的确定.
主要成果:
- 在和时,catechol 在 rutile TiO ((2) ((110) 上形成了一个有序的 4 x 1 覆盖层.
- 最低能量的结构涉及单酸甲基醇结合,其中一个OH组分离.
- 质子交换可以导致双酸甲基醇配置.
- 只有双形态配置才能在TiO(2) 带间隙内引入状态.
结论:
- 吸附剂的结合几何学极大地影响了TiO的电子结构.
- 甲基醇的双酸结合对于产生吸附剂诱导的带隙状态至关重要.
- 这一发现对设计具有定制带间隙的光催化材料有影响.
更多相关视频
13:56Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
08:29Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
相关概念视频
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Predicting Molecular Geometry
VSEPR Theory for Determination of Electron Pair Geometries
Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
MO Theory and Covalent Bonding
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
Molecular Orbital Theory II
Molecular Orbital Energy Diagrams
Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
