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Molecular assembly in porous nanostructures

Shiozawa, Hidetsugu (Elektronische Materialeigenschaften, Wien, AUT); Domanov, Oleg (Faculty of Physics, University of Vienna, Vienna, AUT); Kampfmüller, Johannes (Faculty of Physics, University of Vienna, Vienna, AUT); Briones-Leon, Antonio (Faculty of Physics, University of Vienna, Vienna, AUT); Zechner, Georg (Faculty of Physics, University of Vienna, Vienna, AUT); Sato, Yuta (Nanomaterials Research Institute, AIST, Tsukuba, JPN); Suenaga, Kazu (Nanomaterials Research Institute, AIST, Tsukuba, JPN); Saito, Takeshi (Nanomaterials Research Institute, AIST, Tsukuba, AUT); Weschke, Eugen (BESSY II, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, GER); Eisterer, Michael (Atominstitut, Vienna University of Technology, Vienna, AUT); Peterlik, Herwig (Faculty of Physics, University of Vienna, Vienna, AUT); Lang, Wolfgang (Faculty of Physics, University of Vienna, Vienna, AUT); Pichler, Thomas (Faculty of Physics, University of Vienna, Vienna, AUT)

Porous nanostructures, such as carbon nanotubes (CNTs) and metal-organic frameworks (MOFs), allow atoms and molecules to be assembled in 1D arrays and nanoclusters that could outperform their bulky counterparts. Our experiments using Raman, UV-Vis, photoemission, SQUID, electron microscopy and magnetotransport measurements elucidate electronic and magnetic interactions at guest-host molecular interfaces that are responsible for their unique physical properties. We show that encapsulated inside single-wall carbon nanotubes (SWCNTs) or carbon fibers, iron and nickel clusters behave as stable single-domain magnets exhibiting large coercive fields as the cluster size becomes as small as the exchange length. In MOFs, metal ions are coordinated to form metal arrays and nanovoids. Magnetic transition metal arrays in MOFs are ideal systems in which we study anisotropic magnetic coupling. Metal ions exposed to the interior voids react with infiltrating molecules, leading to MOF’s sensing abilities. We show that the MOF’s electrical conduction and magnetic ordering temperature can tuned by molecular doping.

This work was supported by the Austrian Science Funds (FWF), projects P621333- N20 and P27769-N20

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