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  Using carbon laser patterning to produce flexible, metal-free humidity sensors

Delacroix, S., Zieleniewska, A., Ferguson, A. J., Blackburn, J. L., Ronneberger, S., Löffler, F. F., et al. (2020). Using carbon laser patterning to produce flexible, metal-free humidity sensors. ACS Applied Electronic Materials, 2(12), 4146-4154. doi:10.1021/acsaelm.0c00942.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-8004-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-9EF9-F
Genre: Journal Article

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 Creators:
Delacroix, Simon1, Author              
Zieleniewska, Anna, Author
Ferguson, Andrew J., Author
Blackburn, Jeffrey L., Author
Ronneberger, Sebastian2, Author              
Löffler, Felix F.2, Author              
Strauß, Volker1, Author              
Affiliations:
1Volker Strauß, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3025555              
2Felix Löffler, Biomolekulare Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2385692              

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Free keywords: humidity sensor, carbon laser patterning, laser carbonization, carbon semiconductor, laser-induced graphene, sensing
 Abstract: A relative humidity sensor was produced by carbon laser patterning of a carbon precursor ink on a flexible substrate. Citric acid and urea, both inexpensive and naturally abundant molecules, are used as initial precursors to obtain a porous carbon foam after CO2laser irradiation. The laser-patterned material is characterized by electron microscopy, Raman spectroscopy, and vertical scanning interferometry. An intrinsic p-type semiconducting behavior was confirmed by thermoelectric and Hall measurements. The resistance of this porous, metal-free material is sensitive to atmospheric variations, namely, temperature and relative humidity (≈5Ω·%). Under dry atmosphere, the sensor acts as a thermometer with a linear relationship between temperature and relative variation of resistance (0.07%·K−1). The evolution of the sensor resistance at different relative humidities and temperatures is studied by electrical impedance measurements. The kinetic transitory regime of water desorption from the carbonaceous surface of the sensor is analyzed using Langmuir’s model. The equilibrium constant of adsorption Kads has been determined, and the standard enthalpy of adsorption of water on the sensor surface is estimated atΔadsH°=−42.6 kJ·mol−1. The simple and inexpensive production and its high, stable sensitivity make laser-patterned carbon interesting for humidity sensing applications, and the method allows for the large-scale production of printed sensor arrays.

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Language(s): eng - English
 Dates: 2020-12-092020
 Publication Status: Published in print
 Pages: -
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 Identifiers: DOI: 10.1021/acsaelm.0c00942
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Title: ACS Applied Electronic Materials
  Other : ACS appl. electron. mater.
  Abbreviation : ACS AEM
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Socitey
Pages: - Volume / Issue: 2 (12) Sequence Number: - Start / End Page: 4146 - 4154 Identifier: ISSN: 2637-6113