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TitlePatterned CNT-PDMS nanocomposites for flexible pressure sensors
Author(s)Sousa, Paulo J.
Silva, Luís Guilherme Veiga Rebelo
Gonçalves, L. M.
Minas, Graça
KeywordsCNT-PDMS nanocomposite
Polymeric strain gauges
Issue date26-Feb-2015
CitationSousa, P. J., Silva, L. R., Goncalves, L. M., & Minas, G. (2015). Patterned CNT-PDMS nanocomposites for flexible pressure sensors. Paper presented at the Proceedings - 2015 IEEE 4th Portuguese Meeting on Bioengineering, ENBENG 2015.
Abstract(s)This paper reports the fabrication process and characterization of a flexible pressure sensor based on polydimethylsiloxane (PDMS) and multi-walled carbon nanotubes (CNT-PDMS). The proposed approach relies on patterned CNT-PDMS nanocomposite strain gauges fabricated with SU-8 microstructures (with the micropatterns) in a low‑cost and simple fabrication process. This nanocomposite polymer is mounted over a PDMS membrane, which, in turn, lies on top of a PDMS diaphragm like structure. This configuration enables the PDMS membrane to bend when pressure is applied, thereby affecting the nanocomposite strain gauges, effectively changing their electrical resistance. Carbon nanotubes have several advantages such as excellent mechanical properties, high electrical conductivity and thermal stability. Furthermore, the measurement range of the proposed sensor can be adapted according to the application by varying the CNTs content and geometry of microstructure. In addition, the sensor’s biocompatibility, low cost and simple fabrication makes it very appealing for biomechanical strain sensing. The sensor’s sensitivity was about 0.073%ΔR/mmHg.
TypeConference paper
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:DEI - Artigos em atas de congressos internacionais

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