[1Ba01-09] Surface Science(SS3) Structure

[1Ba04] Transition-Metal Cobalt Nanocluster Formation on 2D Covalent Organic Frameworks

*Toyo Kazu Yamada¹, Keisuke Fukutani², Satoshi Kera² (1. Chiba University, 2. Institute for Molecular Science)

Two-dimensional (2D) covalent organic frameworks (COFs) opened a new pathway to generate 2D nanosheets on a substrate using a single-molecule sublimation method in a vacuum. This led to nanoarchitecture with single-molecule accuracy. This study examined transition-metal cobalt (Co) atom deposition on the 2D COFs on an atomically flat and clean Cu(111) substrate in a vacuum at room temperature. Surface morphology was monitored using scanning tunneling microscopy (STM), and electronic structures were measured using photoelectron spectroscopy (PES). We found that Co atoms have not stayed inside the nanoporous but prefer to be trapped by the edges of the 2D COFs. Once the Co was trapped, other atoms gathered, leading to nanocluster formation with a size of ~3 nm. No strong electronic hybridization between Co atoms and 2D COFs was confirmed; therefore, 2D-COFs were not disturbed by the transition metal adsorption.