Journal
NANOSCALE ADVANCES
Volume 1, Issue 6, Pages 2284-2292Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8na00417j
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Funding
- FCT (Fundacao para a Ciencia e Tecnologia) [UID/FIS/04650/2013, UID/EEA/04436/2013, UID/QUI/0686/2016, PTDC/FIS-MAC/28157/2017]
- FCT [SFRH/BD/110622/2015, SFRH/BPD/112547/2015, SFRH/BPD/110914/2015]
- Spanish Ministry of Economy and Competitiveness (MINECO) (FEDER) [MAT2016-76039C4-3-R]
- Basque Government Industry and Education Departments under the ELKARTEK program
- Basque Government Industry and Education Departments under the HAZITEK program
- Basque Government Industry and Education Departments under the PIBA program [PIBA2018-06]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/110622/2015] Funding Source: FCT
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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.
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