Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7214741 | Composites Science and Technology | 2018 | 30 Pages |
Abstract
This work focuses on the preparation of a piezoresistive sensor device, by exploiting an amphiphilic sample of graphene oxide (GO) as a compatibilizer for poly (lactic acid) (PLA)-Poly (ethylene-glycol) (PEG) blends. The presence of GO determined a high stiffening and strengthening effect, without affecting toughness, and allowed a good stability of mechanical properties up to 40 days. Moreover, GO endowed the materials with electrical properties highly sensitive to pressure and strain variations: the biodegradable pressure sensor showed a responsivity of 35â¯Î¼A/MPa from 0.6 to 8.5â¯MPa, a responsivity around 19â¯Î¼A/MPa from 8.5 to 25â¯MPa. For lower pressure values (around 0.16-0.45â¯MPa), instead, the responsivity increases up to 220â¯Î¼A/MPa in terms of ÎI/ÎP (i.e. (ÎI/ÎI0)/P close to 1â¯kPaâ1). Furthermore, this novel sensor is able to monitor submicrometric displacements with an impressive sensitivity (up to 25â¯Î¼A/μm in terms of ÎI/ÎL, or 70 in terms of (ÎI/I0)/ε). We implemented a model able to predict pressure changes up to 25â¯MPa, by monitoring and measuring variations in electrical conductivity, thus paving the road to use these biodegradable, ecofriendly materials as low-cost sensors for a large pressure range.
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Authors
Roberto Scaffaro, Andrea Maio, Giada Lo Re, Antonino Parisi, Alessandro Busacca,