Topic: The Charge-Vibration Interaction in Assembled Molecular Junction
Time: 3:30pm, May 25 (Friday), 2018
Venue: Room 420, Teaching Building No.3, East Campus
Lecturer: Prof. Yu Xi
Lecturer introduction:Prof. Yu graduated from the Department of Chemistry of Jilin University with a Bachelor's degree. During his master's studies, he began to work on molecular self-assembly systems. From 2006 to 2012, he pursued his PhD degree in the Department of Chemistry at the University of Massachusetts, where he focused on gold nanoparticles’ ligand chemistry and the self-assembly. During the period, he joined the New Energy Research Center set up by the US Department of Energy and began research on energy and charge transfer in an ordered assembly system. He joined the Weizmann Institute in Israel in 2012 and began to focus on molecular electronics and the study of the interaction between charge transfer and molecular vibration. In August 2016, he joined the Department of Chemistry of Tianjin Universityas aresearcher. Research interests are self-assembled molecular electronics and electron-molecular vibrational interactions
Lecture introduction:Molecular electronics studies use the intrinsic properties of molecules to construct electrical devices such as transistors, rectifiers, and molecular switches. It directly associates the physical and chemical properties of the molecule with the electrical properties of the device. It is an interdisciplinary discipline spanning chemistry, physics, electronics, and materials science. Organic molecules vibrate all the time leading to changes in the conformation of molecular structure, profoundly affecting the physical and chemical characteristics of the molecule. In molecular electronic devices, the vibration of molecules also interacts with charge transfer, making the electrical properties of the device show the characteristics of molecular vibration, providing a new dimension for the study of molecular electronics
We explored the path and mechanism of charge transport in the Azurin molecule junction using the resonant and non-resonant inelastic tunneling effects caused by the interaction of charge transfer and molecular vibration. We have provided, for the first time, the Azurin charge transfer pathway and the In-situ experimental evidence for involvement in charge tunneling transmission. On the other hand, we have developed a new method that uses frequency-resolved ultra-fast infrared lasers to selectively excite different molecular vibration modes to regulate charge transfer in organic molecular devices.
All are welcome!
School of Environmental and Chemical Engineering
May 23, 2018
(Translated by Liu Shuai)
