Calendar of Events
Events Calendar
LSM Seminar - Towards Atomically Precise Graphene Nanoribbon Heterostructures Bottom Up
LSM Seminar
Towards Atomically Precise Graphene Nanoribbon Heterostructures Bottom Up
An-Ping Li
Oak Ridge National Laboratory
Department of Physics and Astronomy
12:00 Noon CHEM 260
Bottom-up on-surface approach to the synthesis of graphene nanoribbons (GNRs) has benefited from the combination of reproducible fabrication, the extraordinary programmability and tunability by chemical design, and the ability to order them into large-scale arrays. The on-surface reactions of molecular precursors performed under ultra-high vacuum conditions can further be combined with scanning tunneling microscopy (STM) for in situ characterization of atomic and electronic properties. In this talk, I will discuss our recent progress in realizing GNRs and graphitic heterostructures at atomic precision. Not only can we use STM for in situ characterizations, but to direct chemical reactions and create heterojunctions at selected molecular sites as well. The work illustrates that by using bottom-up synthesis—complemented by advanced microscopy and spectroscopy, as well as theory/simulation to enable atomistic level control—a rational approach to graphitic device structure with designer’s functionalities can be established with atomic precise.