Defect Creation in Surface-Mounted Metal-Organic Framework Thin Films

Zheng Wang, Sebastian Henke, Michael Paulus, Alexander Welle, Zhiying Fan, Katia Rodewald, Bernhard Rieger, Roland A. Fischer

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Defect engineering is a strategy for tailoring the properties of metal-organic frameworks (MOFs). Plenty of efforts have been devoted to study the defect chemistry and structures of bulk MOFs; however, the reported example of a defect-engineered surface-mounted MOF (SURMOF) thin film is rare. In this work, defects were incorporated in SURMOF thin films by using defect-generating linkers and taking advantage of the liquid-phase stepwise epitaxial layer-by-layer growth (LBL). Two methods based on the LBL, named mixing method and alternating method, are proposed for incorporating defects in the prototypical SURMOF HKUST-1 by partially substituting the parent H3btc (benzene-1,3,5-tricarboxylic acid) linker with a set of defect-generating linkers H2ip (isophthalic acid), H2OH-ip (5-hydroxyisophthalic acid), and H2pydc (3,5-pyridinedicarboxylic acid). The crystallinity and phase purity of the obtained "defected" SURMOFs were confirmed by X-ray diffraction, infrared reflection absorption spectroscopy, and Raman spectroscopy. The incorporation of the defect-generating linkers and the types of induced defects were characterized by ultraviolet-visible spectroscopy, time-of-flight secondary ion mass spectrometry, methanol adsorption, scanning electron microscopy, and 1H nuclear magnetic resonance spectroscopy (after digestion of the samples). These two methods provide avenues for controlling the defect formation in MOF thin films.

Original languageEnglish
Pages (from-to)2655-2661
Number of pages7
JournalACS Applied Materials and Interfaces
Volume12
Issue number2
DOIs
StatePublished - 15 Jan 2020

Keywords

  • HKUST-1
  • SURMOF
  • UV-vis
  • defect engineering
  • defective linkers
  • thin films

Fingerprint

Dive into the research topics of 'Defect Creation in Surface-Mounted Metal-Organic Framework Thin Films'. Together they form a unique fingerprint.

Cite this