Flexible pressure sensors: modeling and experimental characterization

Flexible capacitive pressure sensors fabricated with nanocomposites were experimentally characterized and results compared with simulations from analytical modeling. Unlike traditional diaphragm silicon pressure sensors, the flexible nanocomposite sensors present a linear response over a large press...

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Bibliographic Details
Main Author: Sepúlveda, A. T. (author)
Other Authors: Guzmán de Villoria, R. (author), Viana, J. C. (author), Pontes, A. J. (author), Wardle, B. L. (author), Rocha, Luís A. (author)
Format: conferencePaper
Language:eng
Published: 2012
Subjects:
Flexible sensors
Nanocomposites
Modeling
Pressure sensors
Science & Technology
Online Access:http://hdl.handle.net/1822/21197
Country:Portugal
Oai:oai:repositorium.sdum.uminho.pt:1822/21197
Description
Summary:Flexible capacitive pressure sensors fabricated with nanocomposites were experimentally characterized and results compared with simulations from analytical modeling. Unlike traditional diaphragm silicon pressure sensors, the flexible nanocomposite sensors present a linear response over a large pressure range due to the changes in the volume of the dielectric that cause the pressure inside the dielectric cavity to change. Several devices with different geometries were used and the model results compare well with the experimental data. Sensitivities ranging from 2.5- 20 fF/kPa were obtained and the devices dynamic response show a dual behavior, i.e., response time of the sensor during a pressure decreasing step is lower than for a pressure increasing step. This comportment is explained by the viscoelastic behavior of the PDMS-based nanocomposites used for fabrication of the capacitive sensor electrodes.

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