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

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.

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 Creators:
Wang, Huize1, Author           
Ogolla, Charles Otieno, Author
Panchal, Gyanendra, Author
Hepp, Marco, Author
Delacroix, Simon, Author
Cruz, Daniel, Author
Kojda, Danny, Author
Ciston, Jim, Author
Ophus, Colin, Author
Knop-Gericke, Axel, Author
Habicht, Klaus, Author
Butz, Benjamin, Author
Strauß, Volker1, Author           
Affiliations:
1Volker Strauß, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3025555              

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Free keywords: flexible gas sensors, nitrogen-doped carbon, CO2-sensor, carbon laser-patterning, carbon films, pyrolysis, graphitization, carbonization, 4D-STEM
 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.

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Language(s): eng - English
 Dates: 2022-05-052022
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.26434/chemrxiv-2022-6dlsg
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Title: ChemRxiv : the Preprint Server for Chemistry
  Other : ChemRxiv
Source Genre: Journal
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Publ. Info: Washington, DC; Frankfurt am Main; Cambridge, London : ACS, GDCh, Royal Society of Chemistry
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ZDB: 2949894-7