Jahangir, R; Podjaski, F M; Kumar, A; Mouchaham, G; Serre, C; Durrant, J; Naftaly, M (2025) Terahertz Optical Properties of Ti-based Metal Organic Frameworks. In: 2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 17-22 August 2025, Helsinki, Finland.

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Abstract

Metal-Organic-Frameworks (MOFs) are a relatively novel and versatile material class that blends organic and inorganic properties, while yielding highly porous and crystalline structures with broad applications in renewable energies. Two chemically robust and photocatalytically active MOFs, NH2-MIL-125(Ti) and MIL-177(Ti)-LT are investigated and compared, both incorporating titanium oxoclusters as the active inorganic building units, albeit with different sizes and linker geometries. Using THz-TDS, the intrinsic complex refractive index of both these materials is extracted for a better understanding of their property-function relationship on time scales of light-driven charge generation. Both MOFs show higher refractive index than their parent TiO2 (n ~2.32, rutile), with NH2-MIL-125(Ti) being 2.4 times higher, indicating that molecular coordination of inorganic material clusters using organic linkers can enhance a key material property. The THz conductivity of NH2-MIL-125(Ti) (578 ± 2 S/m) is found to be 10 times higher than MIL-177(Ti)-LT, which indicates that the strong electronic interactions between the titanium metal nodes and amino linkers, along with the ordered crystalline structure, promote efficient electron transport.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Optical Radiation and Photonics > Materials and Appearance
Divisions:	Electromagnetic & Electrochemical Technologies
Publisher:	IEEE
Identification number/DOI:	10.1109/IRMMW-THz61557.2025.11320079
Last Modified:	23 Mar 2026 13:36
URI:	https://eprintspublications.npl.co.uk/id/eprint/10339