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  Trained laser-patterned carbon as high-performance mechanical sensors

Hepp, M., Wang, H., Derr, K., Delacroix, S., Ronneberger, S., Loeffler, F. F., et al. (2022). Trained laser-patterned carbon as high-performance mechanical sensors. npj flexible electronics, 6: 3. doi:10.1038/s41528-022-00136-0.

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 Creators:
Hepp, Marco, Author
Wang, Huize1, Author              
Derr, Katharina, Author
Delacroix, Simon, Author
Ronneberger, Sebastian2, Author              
Loeffler, Felix F.2, Author              
Butz, Benjamin, 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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 Abstract: We describe the mechanical properties of turbostratically graphitized carbon films obtained by carbon laser-patterning (CLaP) and their application as bending or mechanical pressure sensors. Stable conductive carbonized films were imprinted on a flexible polyethylene terephthalate (PET) substrate by laser-induced carbonization. After initial gentle bending, i.e. training, these sponge-like porous films show a quantitative and reversible change in resistance upon bending or application of pressure in normal loading direction. Maximum response values of ΔR/R0 = 388% upon positive bending (tensile stress) and −22.9% upon negative bending (compression) are implicit for their high sensitivity towards mechanical deformation. Normal mechanical loading in a range between 0 and 500 kPa causes a response between ΔR/R0 = 0 and −15%. The reversible increase or decrease in resistance is attributed to compression or tension of the turbostratically graphitized domains, respectively. This mechanism is supported by a detailed microstructural and chemical high-resolution transmission electron microscopic analysis of the cross-section of the laser-patterned carbon.

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Language(s): eng - English
 Dates: 2022-01-212022
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41528-022-00136-0
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Title: npj flexible electronics
  Abbreviation : npj Flex Electron
Source Genre: Journal
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Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 6 Sequence Number: 3 Start / End Page: - Identifier: ISSN: 2397-4621