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Trained laser-patterned carbon as high-performance mechanical sensors
Publikationstyp
Journal Article
Date Issued
2022-12-01
Sprache
English
Author(s)
Hepp, Marco
Wang, Huize
Derr, Katharina
Delacroix, Simon
Journal
Volume
6
Issue
1
Article Number
3
Citation
Npj Flexible Electronics 6 (1): 3 (2022)
Publisher DOI
Scopus ID
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/R<inf>0</inf> = 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/R<inf>0</inf> = 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.
DDC Class
600: Technology