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Observation of reduced thermal conductivity in a metal-organic framework due to the presence of adsorbates

Babaei, H.; DeCoster, M. E.; Jeong, M.; Hassan, Z. M.; Islamoglu, T.; Baumgart, H.; McGaughey, A. J. H.; Redel, E.; Farha, O. K.; Hopkins, P. E.; Malen, J. A.; Wilmer, C. E.

Whether the presence of adsorbates increases or decreases thermal conductivity in metal-organic frameworks (MOFs) has been an open question. Here we report observations of thermal transport in the metal-organic framework HKUST-1 in the presence of various liquid adsorbates: water, methanol, and ethanol. Experimental thermoreflectance measurements were performed on single crystals and thin films, and theoretical predictions were made using molecular dynamics simulations. We find that the thermal conductivity of HKUST-1 decreases by 40 – 80% depending on the adsorbate, a result that cannot be explained by effective medium approximations. Our findings demonstrate that adsorbates introduce additional phonon scattering in HKUST-1, which particularly shortens the lifetimes of low-frequency phonon modes. As a result, the system thermal conductivity is lowered to a greater extent than the increase expected by the creation of additional heat transfer channels. Finally, we show that thermal diffusivity is even more greatly reduced than thermal conductivity by adsorption.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123386
Veröffentlicht am 07.09.2020
DOI: 10.1038/s41467-020-17822-0
Zitationen: 12
Web of Science
Zitationen: 12
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000123386
HGF-Programm 47.02.06 (POF III, LK 01) Zellpopul.auf Biofunk.Oberflächen IFG
Erschienen in Nature Communications
Verlag Nature Research
Band 11
Seiten Art.-Nr.: 4010
Nachgewiesen in Dimensions
Web of Science
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