期刊
NANO LETTERS
卷 20, 期 2, 页码 963-970出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03998
关键词
Covalent organic frameworks (COFs); 2D polymer; scanning tunneling microscopy (STM); scanning tunneling spectroscopy (STS); density functional theory (DFT); biphenyl COF (BP-COF); Kagome lattice
类别
资金
- Army Research Office Multidisciplinary University Research Initiative (MURI) [W911NF-15-1-0447]
- U.S. Department of Energy, Office of Basic Energy Sciences Nanomachine Program [DEAC02-05CH11231]
- DOD High Performance Computing Modernization Program
Covalent organic frameworks (COFs) are molecule-based 2D and 3D materials that possess a wide range of mechanical and electronic properties. We have performed a joint experimental and theoretical study of the electronic structure of boroxine-linked COFs grown under ultrahigh vacuum conditions and characterized using scanning tunneling spectroscopy on Au(111) and hBN/Cu(111) substrates. Our results show that a single hBN layer electronically decouples the COF from the metallic substrate, thus suppressing substrate-induced broadening and revealing new features in the COF electronic local density of states (LDOS). The resulting sharpening of LDOS features allows us to experimentally determine the COF band gap, bandwidths, and the electronic hopping amplitude between adjacent COF bridge sites. These experimental parameters are consistent with the results of first-principles theoretical predictions.
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