Achieving large-area uniform two-dimensional (2D) metal-organic frameworks (MOFs) and controlling their electronic properties on inert surfaces is a big step towards future applications in electronic devices. Here we successfully fabricated a 2D monolayer Cu-dicyanoanthracene (DCA) MOF with long-range order on an epitaxial graphene surface. Its structural and electronic properties are studied by low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) complemented by density-functional theory (DFT) calculations. We demonstrate access to multiple molecular charge states in the 2D MOF using tip-induced local electric fields. We expect that a similar strategy could be applied to fabricate and characterize 2D MOFs with exotic, engineered electronic states.
@article{arxiv.2007.06899,
title = {Synthesis and Local Probe Gating of a Monolayer Metal-Organic Framework},
author = {Linghao Yan and Orlando J. Silveira and Benjamin Alldritt and Ondřej Krejčí and Adam S. Foster and Peter Liljeroth},
journal= {arXiv preprint arXiv:2007.06899},
year = {2021}
}