Articles | Volume 7, issue 1
J. Sens. Sens. Syst., 7, 69–78, 2018
https://doi.org/10.5194/jsss-7-69-2018
J. Sens. Sens. Syst., 7, 69–78, 2018
https://doi.org/10.5194/jsss-7-69-2018
Regular research article
06 Feb 2018
Regular research article | 06 Feb 2018

Granular metal–carbon nanocomposites as piezoresistive sensor films – Part 2: Modeling longitudinal and transverse strain sensitivity

Silvan Schwebke et al.

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Cited articles

Beloborodov, I. S., Lopatin, A. V., Vinokur, V. M., and Efetov, K. B.: Granular electronic systems, Rev. Mod. Phys., 79, 469–518, https://doi.org/10.1103/RevModPhys.79.469, 2007. a
Canali, C., Malavasi, D., Morten, B., Prudenziati, M., and Taroni, A.: Piezoresistive effects in thick-film resistors, J. Appl. Phys., 51, 3282–3288, https://doi.org/10.1063/1.328035, 1980. a
El Mel, A. A., Bouts, N., Grigore, E., Gautron, E., Granier, A., Angleraud, B., and Tessier, P. Y.: Shape control of nickel nanostructures incorporated in amorphous carbon films: From globular nanoparticles toward aligned nanowires, J. Appl. Phys., 111, 114309, https://doi.org/10.1063/1.4728164, 2012. a
Grimaldi, C.: Theory of percolation and tunneling regimes in nanogranular metal films, Phys. Rev. B, 89, 214201, https://doi.org/10.1103/PhysRevB.89.214201, 2014. a
Grimaldi, C., Ryser, P., and Strässler, S.: Gauge factor enhancement driven by heterogeneity in thick-film resistors, J. Appl. Phys., 90, 322–327, https://doi.org/10.1063/1.1376672, 2001. a
Short summary
Nickel–Carbon thin films are excellent materials for strain and pressure sensors: they have a sensitivity much higher than conventional metal films and have tunable resistance–temperature characteristics. We investigate the electron conduction mechanisms that lead to their large sensitivity through modeling and numerical simulations. Transverse sensitivity is explained. It is shown in agreement with experiments that the largest sensitivity occurs for a specific nickel/carbon concentration.