Please use this identifier to cite or link to this item: https://hdl.handle.net/1822/64638

TitleOptimized silk fibroin piezoresistive nanocomposites for pressure sensing applications based on natural polymers
Author(s)Reizabal, A.
Gonçalves, Sérgio Abílio Pereira
Brito-Pereira, R.
Costa, P.
Costa, Carlos Miguel Silva
Pérez-Álvarez, L.
Vilas-Vilela, J. L.
Lanceros-Méndez, S.
Issue date2019
PublisherRoyal Society of Chemistry
JournalNanoscale Advances
Abstract(s)Environmental issues promote the development of sensors based on natural polymers which are becoming an area of increasing interest. Piezoresistive sensors based on silk fibroin with carbon nanotubes (CNTs) as fillers were produced by solvent-casting in order to tune their electrical conductivity and electromechanical responses. It is shown that the carbonaceous fillers are well dispersed in the polymer matrix and the thermal and mechanical properties are independent of the CNT content. On the other hand, the inclusion of CNTs reduces the beta-sheet content of silk fibroin and the electrical properties of the composite strongly depend on the filler content, the percolation threshold being around 1 wt% CNTs. The piezoresistive response demonstrates good reproducibility during cyclic loading without hysteresis with a piezoresistive sensitivity of similar to 4 MPa-1, regardless of the CNT content. Overall, the results confirm that polymer composites based on natural polymers exhibit excellent piezoresistive responses, also demonstrated by the implementation and testing of a pressure sensor with the corresponding readout electronics. Thus, it is shown that natural polymers such as silk fibroin will allow the development of a new generation of multifunctional force and deformation sensors.
TypeArticle
URIhttps://hdl.handle.net/1822/64638
DOI10.1039/c8na00417j
ISSN2516-0230
Peer-Reviewedyes
AccessEmbargoed access (2 Years)
Appears in Collections:FUNCTIONAL AND SMART MATERIALS AND SURFACES FOR ADVANCED APPLICATIONS (2018 - ...)
CDQuim - Artigos (Papers)

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