• 文献标题:   Enhanced Crystallinity of Covalent Organic Frameworks Formed Under Physical Confinement by Exfoliated Graphene
  • 文献类型:   Article
  • 作  者:   ROYS JS, O BRIEN JM, STUCCHI ND, RAJ G, HILL AD, YE JY, BROWN RD
  • 作者关键词:   2d confinement, computational chemistry, covalent organic framework, infrared spectroscopy, scanning probe microscopy
  • 出版物名称:   SMALL
  • ISSN:   1613-6810 EI 1613-6829
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1002/smll.202204152 EA OCT 2022
  • 出版年:   2022

▎ 摘  要

The polymerization of 1,4-benzenediboronic acid (BDBA) on mica to form a covalent organic framework (COF-1) reveals a dramatic increase in crystallinity when physically confined by exfoliated graphene. COF-1 domains formed under graphene confinement are highly geometric in shape and on the order of square micrometers in size, while outside of the exfoliated flakes, the COF-1 does not exhibit long-range mesoscale structural order, according to atomic force microscopy imaging. Micro-Fourier transform infrared spectroscopy confirms the presence of COF-1 both outside and underneath the exfoliated graphene flakes, and density functional theory calculations predict that higher mobility and self-assembly are not causes of this higher degree of crystallinity for the confined COF-1 domains. The most likely origin of the confined COF-1's substantial increase in crystallinity is from enhanced dynamic covalent crystallization due to the water confined beneath the graphene flake.