1. Trained laser-patterned carbon as high-performance mechanical sensors.
- Author
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Hepp, Marco, Wang, Huize, Derr, Katharina, Delacroix, Simon, Ronneberger, Sebastian, Loeffler, Felix F., Butz, Benjamin, and Strauss, Volker
- Subjects
CARBON films ,POLYETHYLENE terephthalate ,DEFORMATIONS (Mechanics) ,MICROSCOPY ,DETECTORS ,PRESSURE sensors - 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/R
0 = 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. [ABSTRACT FROM AUTHOR]- Published
- 2022
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