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Flexible CO2 sensor architecture with selective nitrogen functionalities by one-step laser-induced conversion of versatile organic ink

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Wang,  Huize
Volker Strauß, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Strauß,  Volker
Volker Strauß, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Wang, H., Ogolla, C. O., Panchal, G., Hepp, M., Delacroix, S., Cruz, D., et al. (2022). Flexible CO2 sensor architecture with selective nitrogen functionalities by one-step laser-induced conversion of versatile organic ink. ChemRxiv: the Preprint Server for Chemistry. doi:10.26434/chemrxiv-2022-6dlsg.


Cite as: http://hdl.handle.net/21.11116/0000-000A-6C40-5
Abstract
Nitrogen-doped carbons (NC) are a class of sustainable materials for selective CO2 adsorption. We introduce a versatile concept to fabricate flexible NC-based sensor architectures for room-temperature sensing of CO2 in a one-step laser conversion of primary coatings cast from abundant precursors. By the unidirectional energy impact in conjunction with depth-dependent attenuation of the laser beam, a layered sensor heterostructure with porous transducer and active sensor layer is formed. Comprehensive microscopic and spectroscopic cross-sectional analyses confirm the preservation of a high content of imidazolic nitrogen in the sensor. The performance was optimized in terms of material morphology, chemical composition, and surface chemistry to achieve a linear relative resistive response of up to ∆R/R0 = -14.3% (10% of CO2). Thermodynamic analysis yields ΔadsH values of -35.6 kJ·mol-1 and 34.1 kJ·mol-1 for H2O and CO2, respectively. The sensor is operable even in humid environments (e.g., ∆R/R0,RH=80% = 0.53%) and shows good performance upon strong mechanical deformation.