Publication date: 30th May 2020
Thermal managements including anisotorpoic thermal transport are desired to control waste heat and machine exhaust heat. Metal-organic framework (MOF), that is a porous material with the aligned frameworks and micro-pores, is expected as a novel thermal transporting material. The shape and size of the framework structure can be tuned by selecting appropriate metal ions or organic ligands. The thermal transport properties of MOF would be controlled by their structures by taking into account of lattice vibrations conveying the heat. Indeed, theoretical studies revealed that MOF with anisotropic structure, that has one-dimensional pore channels, shows anisotropic thermal transport.[1, 2] However, there is still no experimental proof on the anisotropic thermal transport by MOF because of a lack of MOF oriented films of sufficient size for the measurements. Recently, our groups reported the fabrication of oriented MOF thin films via a heteroepitaxial growth on oriented Cu(OH)2 nanobelts thin films [3]. In this study, free-standing MOF oriented films were synthesized and the thermal transport along the different crystallographioc axes was measured. Cu2(BDC)2 (BDC: 1,4-benzenedicarboxylate) that has anisotropic structure with one-dimensional pore channels along b axis was chosen for the measurements. The fabrication of free-standing Cu2(BDC)2 oriented film was conducted as follows: free-standing Cu(OH)2 oriented nanobelts film was prepared, the conversion from Cu(OH)2 to Cu2(BDC)2 was perfromed by soaking the Cu(OH)2 film into the water/ethanol mixture containing organic linker. In-plane XRD measurements confirmed the crystallographic orientation of Cu2(BDC)2. In-plane thermal diffusivities for the free-standing Cu2(BDC)2 oriented film were measured every 15° where an angle along the b axis of Cu2(BDC)2 was regarded as 0°. The maximum values of thermal diffusivities were observed at 0° and 180°: the thermal diffusivitiy (1.04 mm2/s) at 0° and 180° was ~1.5 times higher than that at 90° and 270° (0.710 mm2/s). This result clearly demonstrated that a MOF with a anisotropic structure showed anisotropic thermal transport. Various types of thermal transport properties will be developed by MOFs with different lattice structures.
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