Eric Yu Rose Hills
On-surface synthesis of 2D covalent organic frameworks
A covalent organic framework is a crystalline structure consisting of covalently bonded organic molecules in a porous network. 2D COFs as thin as a single atomic layer are expected to have exotic electronic properties due to reduced dimensionality. My research is focused on several aspects of these novel nano-structures, including their synthesis on metallic substrate through bottom-up fabrication, atomic-scale visualization utilizing the variable temperature – scanning tunneling microscope (VT-STM), and electronic structure analyzed through spectroscopic techniques. Current methods of thermal evaporation of molecules has limitations when the precursor size is too large. Two systems of interest are carbon-bridged thiophene COF and pyrene-alkyne 2D COF, both of which cannot be deposited using traditional thermal evaporation methods. I will be exploring different methods on these precursors, including pulse injection and drop casting techniques. The ability to deposit heavy molecules efficiently would greatly diversify the types of molecules that we can design and make into 2D COFs.