Terahertz spectroscopy of MOFs reveals dynamic structure and contact free ultrafast photoconductivity

Hamilton, Kendra; Neu, Jens

doi:10.1063/5.0179574

Terahertz spectroscopy of MOFs reveals dynamic structure and contact free ultrafast photoconductivity

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Article describes how metal-organic frameworks (MOFs) are porous crystalline materials, and their large pores make them particularly interesting for membranes, gas separation, and gas storage. The authors discuss how gas-MOF interactions alter the MOFs' spectral fingerprints.

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12 p.

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Hamilton, Kendra & Neu, Jens January 10, 2024.

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This article is part of the collection entitled: UNT Scholarly Works and was provided by the UNT College of Science to the UNT Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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Hamilton, Kendra University of North Texas
Neu, Jens University of North Texas

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American Institute of Physics

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UNT College of Science

The College of Science provides students with the high-demand skills and knowledge to succeed as researchers and professionals. The College includes four departments: Biology, Chemistry, Math, and Physics, and is also home to a number of interdisciplinary programs, centers, institutes, intercollegiate programs, labs, and services.

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Department: Physics

Description

Article describes how metal-organic frameworks (MOFs) are porous crystalline materials, and their large pores make them particularly interesting for membranes, gas separation, and gas storage. The authors discuss how gas-MOF interactions alter the MOFs' spectral fingerprints.

Physical Description

12 p.

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Abstract: Metal-organic frameworks (MOFs) are porous crystalline materials. Their large pores make them particularly interesting for membranes, gas separation, and gas storage. Furthermore, MOFs are ultralight, making them suitable for a large realm of exciting applications ranging from wearable devices to space technology. Optimizing MOFs for these applications demands a detailed understanding of their low energy dynamics and photophysics, which can be provided by terahertz (THz) spectroscopy. MOFs exhibit structural modes, or phonons, with energies in the meV range, which corresponds to the THz spectral range (0.1–10 THz, 0.4–40 meV). Understanding these modes is crucial in determining how a MOF interacts with guest molecules in the process of gas capture and storage. In this perspective, we discuss how gas-MOF interactions alter the MOFs’ spectral fingerprints. We demonstrate that THz spectroscopy can be used for gas adsorption monitoring and explain how density functional theory, together with THz spectra, can illuminate the dynamic structure of MOFs, providing unique insight into their functionality. THz is also a contact free probe for conductivity and allows us to measure short range conductivity within an individual MOF crystal. We will discuss the advantages of THz as a conductivity probe for MOFs as compared to more established direct current techniques. We will then expand our view to incorporate ultrafast photoconductivity in MOFs measured via optical pump-THz probe spectroscopy, in comparison to more established ultrafast spectroscopic tools such as optical transient absorption and photoluminescence. We will supplement this section with a discussion of THz studies on perovskites, which unveiled electron–phonon interactions not yet explored in MOFs.

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APL Materials, 12(1), American Institute of Physics, January 10, 2024, pp. 1-12

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English

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Article

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Digital Object Identifier: https://doi.org/10.1063/5.0179574
Accession or Local Control No: 010903_1_5.0179574
Archival Resource Key: ark:/67531/metadc2288862

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Publication Title: APL Materials
Volume: 12
Issue: 1
Peer Reviewed: Yes

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UNT Scholarly Works

Materials from the UNT community's research, creative, and scholarly activities and UNT's Open Access Repository. Access to some items in this collection may be restricted.

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January 10, 2024

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March 5, 2024, 2:18 p.m.

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March 20, 2024, 1:13 p.m.

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Hamilton, Kendra & Neu, Jens. Terahertz spectroscopy of MOFs reveals dynamic structure and contact free ultrafast photoconductivity, article, January 10, 2024; (https://digital.library.unt.edu/ark:/67531/metadc2288862/: accessed May 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Science.

Terahertz spectroscopy of MOFs reveals dynamic structure and contact free ultrafast photoconductivity

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