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STM Characterization of hBN-Decoupled Covalent Organic Frameworks

ORAL

Abstract

Covalent organic frameworks (COFs) are crystalline molecular networks with potential applications in filtration, organic electronics, energy storage, and catalysis. Recent advances in COF synthesis have permitted the growth and characterization of COFs that exhibit different symmetries and that use a wide range of molecular building blocks. Despite this progress, there have only been a limited number of experimental demonstrations of the electronic structure-function relationship for COFs, particularly in the 2D limit. One experimental challenge is how to separate the intrinsic COF electronic structure from the influence of metallic growth substrates. In order to accomplish this, we have introduced an atomic insulating film of hBN between a COF and an underlying metallic substrate to act as a decoupling layer. Using scanning tunneling microscopy and spectroscopy we are able to obtain more detailed spectral information on hBN-decoupled COFs compared to those grown directly on a metallic substrate. First-principles DFT and tight-binding calculations confirm that hBN-decoupled COFs possess spectral features that reflect the COF’s Kagome lattice symmetry.

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Presenters

  • Daniel Rizzo

    University of California, Berkeley

Authors

  • Daniel Rizzo

    University of California, Berkeley

  • Qingqing Dai

    Georgia Inst of Tech, Georgia Institute of Technology

  • Christopher Bronner

    University of California, Berkeley

  • Gregory Veber

    University of California, Berkeley

  • Brian J Smith

    Bucknell University

  • Michio Matsumoto

    Northwestern University

  • Simil Thomas

    Chemistry, Georgia Tech, Georgia Inst of Tech, Georgia Institute of Technology

  • Giang Duc Nguyen

    Stewart Blusson Quantum Matter Institute, University of British Columbia, University of California, Berkeley, University of British Columbia

  • Patrick R Forrester

    Harvard University, Department of Physics, Harvard University, University of California, Berkeley

  • William Zhao

    University of California, Berkeley

  • Jakob H Jorgensen

    University of California, Berkeley

  • William Dichtel

    Chemistry, Northwestern University, Northwestern University

  • Felix Fischer

    University of California, Berkeley

  • Hong Li

    Chemistry, Georgia Tech, Georgia Inst of Tech, Georgia Institute of Technology

  • Jean-Luc E Bredas

    Chemistry, Georgia Tech, Georgia Inst of Tech, Georgia Institute of Technology

  • Michael F Crommie

    Lawrence Berkeley National Lab and UC Berkeley, University of California, Berkeley