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    Item type:Publication, Access status: with files ,
    Ammonia and amine responsive conjugated materials for reusable colorimetric sensing
    (Wiley-VCH, 2026-05-14)
    Thümmler, Ronja
    ;
    Barros-Martínez, Adriana
    ;
    Lissel, Franziska S-C
    ;
    Istif, Emin
    Ammonia and primary amines play indispensable roles in nature, agriculture, biology, and the chemical industry. Beyond their critical functions, they also serve as vital indicators in various applications, such as monitoring food spoilage, air pollution, and certain chronic diseases. Therefore, the development of novel materials for precise, simultaneous, and rapid detection of ammonia and amines is at the forefront of current research. In this study, we synthesized a series of π-conjugated materials containing cyclic maleic anhydride (MA) moieties, which provide reactive sites for ammonia/amine interaction, enabling colorimetric sensing. The materials were synthesized via green chemistry approaches without the use of metal catalysts or hazardous solvents. We investigated the colorimetric response of these materials toward ammonia and primary amines using optical spectroscopy and demonstrated their practical applicability by fabricating paper-based colorimetric assays. Notably, the color change induced by ammonia exposure was reversible upon treatment with acid, indicating the reusability of the sensor. This work presents a new class of sustainably synthesized materials as an alternative to conventional methods, offering a reusable sensing platform for colorimetric ammonia/amine detection.
    Publicationtype: Journal Article
      77  79
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    Item type:Publication, Access status: without files ,
    Challenges in realization of curved metasurfaces
    (IEEE, 2026-04)
    Mikulić, Davorin
    ;
    Cejmer, Tommy
    ;
    Istif, Emin
    ;
    Lissel, Franziska
    ;
    Boisseau, Thibault
    Curved metasurfaces enable conformal and flexible antenna solutions but introduce challenges absent in planar designs. These include optimal surface reactance synthesis, mechanical flexibility of dielectric and metallization layers, RF integration on curved geometries, and complex experimental characterization. This paper addresses each of these aspects, providing design, fabrication, and validation methodologies for curved metasurface structures.
    Publicationtype: Conference Paper
      13