Video Experimental Relacionado
Updated: Jul 10, 2026
08:43
Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
Published on: November 7, 2016
Cambio de conductividad en moléculas individuales a través de cambios conformacionales
Z J Donhauser1, B A Mantooth, K F Kelly
1Department of Chemistry, The Pennsylvania State University, University Park, PA 16802-6300, USA.
Science (New York, N.Y.)
|June 26, 2001
Resumen
La conmutación de la conductividad en los oligómeros de fenileno etileno depende de la matriz circundante. Las matrices bien ordenadas reducen las tasas de conmutación, lo que sugiere que los cambios conformacionales impulsan este comportamiento molecular.
Área de la Ciencia:
- La electrónica molecular es la electrónica molecular.
- Los fenómenos de cambio de conducta son fenómenos de cambio de conducta.
- Dinámica de los oligómeros
Sus antecedentes:
- Comprender la conmutación molecular es crucial para el desarrollo de dispositivos electrónicos avanzados.
- Los oligómeros de fenileno etileno son candidatos prometedores para los interruptores moleculares.
- La influencia de la matriz circundante en el comportamiento molecular no se entiende completamente.
Objetivo del estudio:
- Para investigar la dinámica de conmutación de conductividad de oligómeros de fenileno etileno individuales y agrupados.
- Para determinar los factores que influyen en la persistencia y la velocidad de la conmutación molecular.
- Para dilucidar el mecanismo detrás de la conmutación de conductividad en estos oligómeros.
Principales métodos:
- Cambio de conductividad de seguimiento a lo largo del tiempo para oligómeros aislados y agrupados.
- Utilizando monocapas de alcanetiolato como matrices aislantes.
- Correlación del comportamiento de conmutación con el ordenamiento de la matriz circundante.
Principales resultados:
- Los tiempos de persistencia para los estados ON/OFF oscilaron entre segundos y decenas de horas.
- Las matrices bien ordenadas exhibieron tasas de conmutación más bajas en comparación con las matrices mal ordenadas.
- La frecuencia de conmutación fue mayor en las matrices circundantes menos ordenadas.
Conclusiones:
- La conmutación molecular es impulsada principalmente por cambios conformacionales en los oligómeros o en los paquetes.
- Es poco probable que los efectos electrostáticos de la transferencia de carga sean la causa principal de la conmutación.
- El entorno molecular tiene un impacto significativo en la estabilidad y dinámica de los interruptores moleculares.
Videos de Conceptos Relacionados
01:15Charging Conductors By Induction
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
01:29Induced Electric Dipoles
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
01:16Electrostatic Boundary Conditions
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
01:29Electrical Transport
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...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...