Trained laser-patterned carbon as high-performance mechanical sensors

Hepp, Marco; Wang, Huize; Derr, Katharina; Delacroix, Simon; Ronneberger, Sebastian; Loeffler, Felix F.; Butz, Benjamin; Strauss, Volker

doi:10.1038/s41528-022-00136-0

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Trained laser-patterned carbon as high-performance mechanical sensors

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

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Ronneberger, Sebastian
Felix Löffler, Biomolekulare Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Loeffler, Felix F.
Felix Löffler, Biomolekulare Systeme, 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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Zitation

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.

Zitierlink: https://hdl.handle.net/21.11116/0000-0009-D2C2-E

Zusammenfassung

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.