Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

Please always quote using this URN: urn:nbn:de:bvb:20-opus-213671
• The detection of toxic gases, such as NH$$_{3}$$ and CO, in the environment is of high interest in chemical, electronic, and automotive industry as even small amounts can display a health risk for workers. Sensors for the real‐time monitoring of these gases should be simple, robust, reversible, highly sensitive, inexpensive and show a fast response. The indicator supraparticles presented herein can fulfill all of these requirements. They consist of silica nanoparticles, which are assembled to supraparticles upon spray‐drying. Sensing moleculesThe detection of toxic gases, such as NH$$_{3}$$ and CO, in the environment is of high interest in chemical, electronic, and automotive industry as even small amounts can display a health risk for workers. Sensors for the real‐time monitoring of these gases should be simple, robust, reversible, highly sensitive, inexpensive and show a fast response. The indicator supraparticles presented herein can fulfill all of these requirements. They consist of silica nanoparticles, which are assembled to supraparticles upon spray‐drying. Sensing molecules such as Reichardt's dye and a binuclear rhodium complex are loaded onto the microparticles to target NH$$_{3}$$ and CO detection, respectively. The spray‐drying technique affords high flexibility in primary nanoparticle size selection and thus, easy adjustment of the porosity and specific surface area of the obtained micrometer‐sized supraparticles. This ultimately enables the fine‐tuning of the sensor sensitivity and response. For the application of the indicator supraparticles in a gas detection device, they can be immobilized on a coating. Due to their microscale size, they are large enough to poke out of thin coating layers, thus guaranteeing their gas accessibility, while being small enough to be applicable to flexible substrates.

Author: Susanne Wintzheimer, Maximilian Oppmann, Martin Dold, Carolin Pannek, Marie‐Luise Bauersfeld, Michael Henfling, Sabine Trupp, Benedikt Schug, Karl Mandel urn:nbn:de:bvb:20-opus-213671 Journal article Fakultät für Chemie und Pharmazie / Lehrstuhl für Chemische Technologie der Materialsynthese English Particle & Particle Systems Characterization 2019 36 10 1900254 Particle & Particle Systems Characterization 2019, 36(10):1900254. DOI: 10.1002/ppsc.201900254 https://doi.org/10.1002/ppsc.201900254 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften CO sensing; NH$$_{3}$$; sensor supports; silica supraparticles; smart surfaces 2021/03/30 CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International