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Impact of host–guest interactions on the dielectric properties of MFM-300 materials

DOI: 10.1021/acs.inorgchem.3c02110 DOI Help

Authors: Xi Chen (University of Manchester) , Sergey Sapchenko (University of Manchester) , Wanpeng Lu (University of Manchester) , Ming Li (University of Nottingham) , Meng He (University of Manchester) , Yinlin Chen (University of Manchester) , Mark D. Frogley (Diamond Light Source) , Ivan Da Silva (ISIS Facility) , Sihai Yang (University of Manchester) , Martin Schroeder (University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Inorganic Chemistry

State: Published (Approved)
Published: October 2023
Diamond Proposal Number(s): 22137 , 30398

Open Access Open Access

Abstract: Metal–organic framework (MOF) materials are attracting increasing interest in the field of electronics due to their structural diversity, intrinsic porosity, and designable host–guest interactions. Here, we report the dielectric properties of a series of robust materials, MFM-300(M) (M = Al, Sc, Cr, Fe, Ga, In), when exposed to different guest molecules. MFM-300(Fe) exhibits the most notable increase in dielectric constant to 35.3 ± 0.3 at 10 kHz upon adsorption of NH3. Structural analysis suggests that the electron delocalization induced by host–guest interactions between NH3 and the MOF host, as confirmed by neutron powder diffraction studies, leads to structural polarization, resulting in a high dielectric constant for NH3@MFM-300(Fe). This is further supported by ligand-to-metal charge-transfer transitions observed by solid-state UV/vis spectroscopy. The high detection sensitivity and stability to NH3 suggest that MFM-300(Fe) may act as a powerful dielectric-based sensor for NH3.

Subject Areas: Materials, Chemistry, Physics

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy

Added On: 11/10/2023 10:37


Discipline Tags:

Physics Physical Chemistry Electronics Chemistry Materials Science Metal-Organic Frameworks Metallurgy Organometallic Chemistry

Technical Tags:

Spectroscopy Infrared Spectroscopy Synchtron-based Fourier Transform Infrared Spectroscopy (SR-FTIR)