Increasing demands in the field of sensing, especially for gas detection applications, require new approaches to chemical sensors. Metal-organic frameworks (MOFs) can play a decisive role owing to their outstanding performances regarding gas selectivity and sensitivity. The tetrathiafulvalene (TTF)-infiltrated MOF, Co-MOF-74, has been prepared following the host-guest concept and evaluated in resistive gas sensing. The Co-MOF-74-TTF crystal morphology has been characterized via X-ray diffraction and scanning electron microscopy, while the successful incorporation of TTF into the MOF has been validated via X-ray photoemission spectroscopy, thermogravimetric analysis, UV/vis, infrared (IR), and Raman investigations. We demonstrate a reduced yet ample uptake of CO2 in the pores of the new material by IR imaging and adsorption isotherms. The nanocomposite Co-MOF-74-TTF exhibits an increased electrical conductivity in comparison to Co-MOF-74 which can be influenced by gas adsorption from a surrounding atmosphere. This effect could be used for gas sensing.

Faculty of Physics and Earth Sciences Universität Leipzig Linnéstraße 5 D 04103 Leipzig Germany

Faculty of Physics University of Vienna Boltzmanngasse 5 A 1090 Vienna Austria

Institute of Physical Chemistry and Electrochemistry Leibniz Universität Hannover Callinstraße 3A D 30167 Hanover Germany

J Heyrovsky Institute of Physical Chemistry Czech Academy of Sciences Dolejskova 3 CZ 18223 Prague 8 Czech Republic

Laboratory for Nano and Quantum Engineering Leibniz University Hannover Schneiderberg 39 D 30167 Hanover Germany

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