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Polymer Nanocomposite-Based Strain Sensors with Tailored Processability and Improved Device Integration

Title
Polymer Nanocomposite-Based Strain Sensors with Tailored Processability and Improved Device Integration
Type
Article in International Scientific Journal
Year
2018
Authors
Costa, P
(Author)
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Carvalho, MF
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Correia, V
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Viana, JC
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Lanceros Mendez, S
(Author)
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Journal
Vol. 1
Pages: 3015-3025
Other information
Authenticus ID: P-00Q-DQQ
Abstract (EN): Because of its easy processability and elastomeric properties, the triblock copolymer styrene-butadiene-styrene (SBS) is an excellent matrix for the development of piezoresistive polymer composites, mostly for larger strain composites. Piezoresistive sensors based in SBS and conductive nanofillers were processed by scalable methods, namely, extrusion and spray printing, allowing the measurement of large deformations up to 20% of strain with low mechanical hysteresis in loading-unloading cycles. The carbon nanotube (CNT) reinforcement increases the mechanical properties (maximum stress and strain) and provides electrical properties to the composites. Extruded and spray printed CNT/SBS composites show a piezoresistive sensibility (gauge factor) up to 4 and 2, respectively. Their percolation threshold is near 6 and 1 wt %, for extruded and spray-printed methods, respectively. The excellent piezoresistive reproducibility, processability, and easy integration in structures and devices show the suitability of those materials for applications, as demonstrated by the implementation of a hand glove able to measure the movement of the fingers. The electronic readout system developed allows, in real-time, the measurement and saving of the data points of each piezoresistive sensor in a remote platform. Thus, the present paper demonstrates the optimization, processing by scalable methods, and integration of piezoresistive polymer-based materials for force and deformation sensor applications.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 21
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