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Flexible CO 2 Sensor Architecture with Selective Nitrogen Functionalities by One‐Step Laser‐Induced Conversion of Versatile Organic Ink
Author(s) -
Wang Huize,
Ogolla Charles Otieno,
Panchal Gyanendra,
Hepp Marco,
Delacroix Simon,
Cruz Daniel,
Kojda Danny,
Ciston Jim,
Ophus Colin,
KnopGericke Axel,
Habicht Klaus,
Butz Benjamin,
Strauss Volker
Publication year - 2022
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202207406
Subject(s) - materials science , nitrogen , laser , adsorption , porosity , resistive touchscreen , chemical engineering , transducer , heterojunction , analytical chemistry (journal) , nanotechnology , optoelectronics , composite material , organic chemistry , optics , chemistry , physics , electrical engineering , quantum mechanics , engineering
Nitrogen‐containing carbons (NC) are a class of sustainable materials for selective CO 2 adsorption. A versatile concept is introduced to fabricate flexible NC‐based sensor architectures for room‐temperature sensing of CO 2 in a one‐step laser conversion of primary films cast from abundant precursors. By the unidirectional energy impact in conjunction with depth‐dependent attenuation of the laser beam, a layered sensor heterostructure with a porous transducer and active sensor layer is formed. Comprehensive microscopic and spectroscopic cross‐sectional analyses confirm the preservation of the high content of imidazolic nitrogen in the sensor. The performance is optimized in terms of material morphology, chemical composition, and surface chemistry to achieve a linear relative resistive response of up to Δ R / R 0 = −14.3% (10% of CO 2 ). Thermodynamic analysis yields Δ ads H values of −35.6 and 34.1 kJ·mol −1 for H 2 O and CO 2 , respectively. The sensor is operable even in humid environments (e.g., ∆ R / R 0,RH = 80% = 0.53%) and shows good performance upon strong mechanical deformation.