Topic: The Charge-Vibration Interaction in Assembled Molecular Junction
Time: 15:30, June 27th, 2017
Venue: 404 Conference Room, Building of Science, West Campus
Lecturer: Xi Yu
About the Lecturer: Yu graduated from College of Chemistry of Jilin University with a Bachelor’s Degree and a Master’s Degree. When he pursued his Master’s Degree, he began his research on Molecular Self-Assembly. Yu studied for his Doctoral Degree in the Department of Chemistry of University of Massachusetts from 2006 to 2012, focused on the Ligand and Self-Assembly of AuNPs. He joined the Research Center of New Energy of U.S. Department of Energy, and studied Energy and Charge Transport in Nanostructure Ordering Assembled System. He joined Weizmann Institute of Science in 2012, focused on Molecular Electronics and Interaction between Charge Transport and Molecular Vibration. He assumed the role of researcher at School of Chemical Engineering and Technology of Tianjin University in August 2016. His main research covered Molecular Self-Assembly Electronics and Interaction of Electron-Molecule Vibration.
About the Lecture: Molecular Electronics is the study and application of molecular building blocks for the fabrication of electronic components, such as transistor, rectifier, molecular switches, etc. It unifies features of both molecular building blocks and electronic components, which is an interdisciplinary area that spans physics, chemistry, electronics and materials science. Ceaseless vibration of organic molecules leads to the change in structure and conformation, which strongly influences their physical and chemical functionality. The Charge-vibration interaction opens the way to observe the feature of molecular vibration from electronic properties in organic electronic devices, which introduced a new dimension to the research on Molecular Electronics.
Resonance and off-resonance inelastic electron tunneling spectroscopy (RIETS) caused by Charge-Vibration Interaction was utilized to obtain insights into the Electron Transport (ETp) mechanism in Azurin molecular junction, which for the first time provided sound proof of the charge transport track in Azurin junctions and the participation of the Cu ion in the charge transport in RIETS experiment. On the other hand, a new approach was developed that using an ultrafast infrared laser source, charge transport in an organic molecular device can be modulated by the selective excitation of molecular vibrations.
All teachers and students are welcome.
1. Galperin, M.; Ratner, M.; Nitzan, A.Molecular Transport Junctions: Vibrational Effects. J Phys Condens Matter 2007,19, 103201.
2. Galperin, M.; Ratner, M.; Nitzan, A.; Troisi,A. Nuclear Coupling and Polarization in Molecular Transport Junctions: BeyondTunneling to Function. Science 2008, 319, 1056–1060.
3. Yu, X.; Lovrincic, R.; Sepunaru, L.; Li, W.;Vilan, A.; Pecht, I.; Sheves, M.; Cahen, D. Insights into Solid-State ElectronTransport through Proteins from Inelastic Tunneling Spectroscopy: The Case ofAzurin. ACS Nano 2015, 9, 9955–9963.
4. Fereiro, J. A.; Yu X.*; Rodriguez, J. C. C.;Pecht, I.; Sheves, M.; Cahen, D.*; Resonance Tunneling and Resonance Inelastictunneling Charge Transport in Azurin Junction, in prepration.
5. Bakulin, A. A. #; Lovrincic, R. #; Yu, X. #;Selig, O.; Bakker, H. J.; Rezus, Y. L.; Nayak, P. K.; Fonari, A.; Coropceanu,V.; Brédas, J.-L. L.; et al. Mode-Selective Vibrational Modulation of ChargeTransport in Organic Electronic Devices. Nat Commun 2015, 6, 7880.
School of Science
June 23rd, 2017