对于石墨烯类分子的连接驱动电导率的魔力比率
Yan Geng1, Sara Sangtarash2, Cancan Huang1
1†Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
Journal of the American Chemical Society
|March 18, 2015
概括
一个新的魔力比率规则 (MRR) 预测了基于电极连接位置的石墨烯样分子的电导率比率. 这一从实验和理论中得出的规则,为分子电子学提供了洞察力.
科学领域:
- 分子电子学分子电子学
- 凝聚物质物理学 凝聚物质物理学
- 量子化学是一种量子化学.
背景情况:
- 了解分子系统中的电导率对于开发新型电子设备至关重要.
- 分子结构,连接性和导电性之间的关系是复杂的,需要理论和实验研究.
研究的目的:
- 引入和验证一种新的魔力比率规则 (MRR),用于预测石墨烯类芳香分子中的电导率.
- 建立分子连接性和电传输特性之间的定量联系.
主要方法:
- 进行机械控制的断路试验,以测量电导率.
- 密度函数理论 (DFT) 的计算被用来建模分子行为和电子结构.
主要成果:
- 展示了一种新的魔力比率规则 (MRR),利用基于电极连接位置分配的"魔力整数" (Mii).
- 该MRR预测,具有相同芳香核但不同连接点的分子的导电比与它们的神奇整数比率 ((Mii") /Mjj")) ^2) 的平方成比例.
- 该规则显示了紧密结合模型的精确性,并作为真实分子系统的定性指南.
结论:
- 该MRR提供了一个强大的,基于连接性的方法来预测和理解芳香分子中的电导率.
- 这一发现对分子电线和其他有机电子元件的合理设计有影响.
更多相关视频
相关概念视频
Debye–Huckel–Onsager Conductance Equation
255
The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect.
255
Electrical Transport
158
The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
158
Boundary Conditions for Current Density
1.5K
Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
1.5K
Electrical Conductivity
2.2K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
2.2K
Resistivity
6.3K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
6.3K
Network Covalent Solids
16.6K
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...
16.6K


