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Facile microwave synthesis of zirconium metal-organic framework thin films on gold and silicon and application to sensor functionalization

Journal Article · · Microporous and Mesoporous Materials
Zirconium-based metal-organic frameworks, including UiO-66 and related frameworks, have become the focus of considerable research in the area of chemical warfare agent (CWA) decontamination. However, little work has been reported exploring these metal-organic frameworks (MOFs) for CWA sensing applications. For many sensing approaches, the growth of high-quality thin films of the active material is required, and thin film growth methods must be compatible with complex device architectures. Several approaches to synthesize thin films of UiO-66 have been described but many of these existing methods are complex or time consuming. In this work, we describe the development of a simple and rapid microwave assisted synthesis of oriented UiO-66 thin films on unmodified silicon (Si) and gold (Au) substrates. Thin films of UiO-66 and UiO-66-NH2 can be grown in as little as 2 min on gold substrates and 30 min on Si substrates. The film morphology and orientation are characterized and the effects of reaction time and temperature on thin film growth on Au are investigated. Both reaction time and temperature impact the overgrowth of protruding discrete crystallites in the thin film layer but, surprisingly, no strong correlation is observed between film thickness and reaction time or temperature. We also briefly describe the synthesis of Zr/Ce solid solution thin films of UiO-66 on Au and report the first synthesis of a solid solution thin film MOF. Finally, we demonstrate the utility of the microwave method for the facile functionalization of two sensor architectures, plasmonic nanohole arrays and microresonators, with UiO-66 thin films.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
Defense Threat Reduction Agency (DTRA); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC04-94AL85000; NA0003525
OSTI ID:
1798139
Alternate ID(s):
OSTI ID: 1815085
Report Number(s):
SAND--2021-6837J; 696741
Journal Information:
Microporous and Mesoporous Materials, Journal Name: Microporous and Mesoporous Materials Vol. 323; ISSN 1387-1811
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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