• Treger, Marvin
• Caro, Juergen
• Bigall, Nadja C.
• Shiozawa, Hidetsugu
• Mundstock, Alexander
• Hwang, Seungtaik
• Pichler, Thomas
• Strauss, Ina
• Lange, Karsten
• Chmelik, Christian
• Rusch, Pascal

Abstract

<p>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, CoMOF-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 CO, 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.</p>

Topics

• nanocomposite
• pore
• morphology
• scanning electron microscopy
• x-ray diffraction
• thermogravimetry
• electrical conductivity
• spectroscopy