ON-SURFACE CHEMISTRY – AN AVENUE TO PRECISE SYNTHESIS

05/09/2023

Zoom

15:30

Yusen Zheng Schulich Faculty of Chemistry, Technion GTIIIT

Physical-Chemistry Seminar

On-Surface Chemistry – an avenue to Precise Synthesis

Yusen Zheng

Under supervision of Prof. Alon Hoffman (Technion) and Prof. Kai Huang (GTIIT)

 

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.