On-Surface Chemistry – An avenue to Precise Synthesis (Literature Talk)

Title

On-Surface Chemistry – An avenue to Precise Synthesis (Literature Talk)

Speaker

Yusen Zheng (4th year PhD Student in Chemistry under the supervision Prof. Kai Huang/GTIIT, Prof. Alon Hoffman/Technion)

Time and Location

September 5, 2023, Tuesday, 8:30pm (China time)

Zoom Meeting

https://technion.zoom.us/my/dgklab

Language

English

Abstract

On-surface chemistry, often known as two-dimensional chemistry, has become a research hotspot in the past decade. The aim of on-surface chemistry is to prepare covalent compounds that are difficult to produce by standard solution chemistry. For example, the selective dehalogenation and polymerization of linear alkane terminal groups on metal surfaces; the synthesis of graphene nanoribbons with controllable boundaries and widths on metal surfaces, etc. In this seminar, I will firstly share the pioneering work of on-surface chemistry that couple iodobenzene to biphenyl precisely under UHV conditions via SPM tip manipulate. Then, I will talk about the preparation of polyfluorenes chain polymerization by dibromoterfluorene under the strategy of on-surface synthesis which could not be synthesized in traditional chemical processes. Finally, the fabrication of graphene nanoribbons in different topologies and widths by on-surface technique will be presented. These works illustrate the building of covalent molecular, one-dimensional polymer chain and two-dimensional network of graphene can be successfully realized by on-surface chemistry.

Reference
1. Hla, S. W., Bartels, L., Meyer, G., & Rieder, K. H. (2000). Inducing all steps of a chemical reaction with the scanning tunneling microscope tip: towards single molecule engineering. Physical review letters, 85(13), 2777.
2. Lafferentz, L., Ample, F., Yu, H., Hecht, S., Joachim, C., & Grill, L. (2009). Conductance of a single conjugated polymer as a continuous function of its length. Science, 323(5918), 1193-1197.
3. Cai, J., Ruffieux, P., Jaafar, R., Bieri, M., Braun, T., Blankenburg, S., Muoth, M., Seitsonen, A., Saleh, M., Feng, X., Müllen, K., Fasel, R. (2010). Atomically precise bottom-up fabrication of graphene nanoribbons. Nature, 466(7305), 470-473.

Biography

Mr. Yusen Zheng is currently a 4th year PhD student in Chemistry at Technion – Israel Institute of Technology and Guangdong Technion – Israel Institute of Technology. He obtained his BSc degree from Guangdong University of Technology in 2016 and his MSc degree from Shantou University in 2019. Since then, he has been studying niridation of diamond surfaces towards his doctoral degree under the supervision of Prof. Kai Huang (GTIIT, Chemistry) and Prof. Alon Hoffman (Technion, Chemistry). During this PhD studies, he has so far published 3 research articles in peer-reviewed scientific journals. In 2021, he won a prize in presenting a poster at the 32nd Chinese Chemical Society Congress, Zhuhai, China. In 2022, he delivered an oral presentation in the American Chemical Society Fall Meeting, Chicago. In 2023，he delivered a poster presentation in the American Chemical Society Fall Meeting, San Francisco , USA.