The high demand for multifunctional devices for smart clothing applications, human motion detection, soft robotics, and artificial electronic skins has encouraged researchers to develop new high-performance flexible sensors. In this work, we fabricated and tested new 3D squeezable Ecoflex® open cell foams loaded with different concentrations of graphene nanoplatelets (GNPs) in order to obtain lightweight, soft, and cost-effective piezoresistive sensors with high sensitivity in a low-pressure regime. We analyzed the morphology of the produced materials and characterized both the mechanical and piezoresistive response of samples through quasi-static cyclic compression tests. Results indicated that sensors infiltrated with 1 mg of ethanol/GNP solution with a GNP concentration of 3 mg/mL were more sensitive and stable compared to those infiltrated with the same amount of ethanol/GNP solution but with a lower GNP concentration. The electromechanical response of the sensors showed a negative piezoresistive behavior up to ~10 kPa and an opposite trend for the 10–40 kPa range. The sensors were particularly sensitive at very low deformations, thus obtaining a maximum sensitivity of 0.28 kPa−1 for pressures lower than 10 kPa.

Flexible ecoflex®/graphene nanoplatelet foams for highly sensitive low-pressure sensors / Fortunato, M.; Bellagamba, I.; Tamburrano, A.; Sarto, M. S.. - In: SENSORS. - ISSN 1424-8220. - 20:16(2020), pp. 1-18. [10.3390/s20164406]

Flexible ecoflex®/graphene nanoplatelet foams for highly sensitive low-pressure sensors

Fortunato M.;Bellagamba I.;Tamburrano A.;Sarto M. S.
2020

Abstract

The high demand for multifunctional devices for smart clothing applications, human motion detection, soft robotics, and artificial electronic skins has encouraged researchers to develop new high-performance flexible sensors. In this work, we fabricated and tested new 3D squeezable Ecoflex® open cell foams loaded with different concentrations of graphene nanoplatelets (GNPs) in order to obtain lightweight, soft, and cost-effective piezoresistive sensors with high sensitivity in a low-pressure regime. We analyzed the morphology of the produced materials and characterized both the mechanical and piezoresistive response of samples through quasi-static cyclic compression tests. Results indicated that sensors infiltrated with 1 mg of ethanol/GNP solution with a GNP concentration of 3 mg/mL were more sensitive and stable compared to those infiltrated with the same amount of ethanol/GNP solution but with a lower GNP concentration. The electromechanical response of the sensors showed a negative piezoresistive behavior up to ~10 kPa and an opposite trend for the 10–40 kPa range. The sensors were particularly sensitive at very low deformations, thus obtaining a maximum sensitivity of 0.28 kPa−1 for pressures lower than 10 kPa.
2020
ecoflex®; foam; graphene; low-pressure sensor; nanoplatelets; negative piezoresistivity; positive piezoresistivity; wearable devices
01 Pubblicazione su rivista::01a Articolo in rivista
Flexible ecoflex®/graphene nanoplatelet foams for highly sensitive low-pressure sensors / Fortunato, M.; Bellagamba, I.; Tamburrano, A.; Sarto, M. S.. - In: SENSORS. - ISSN 1424-8220. - 20:16(2020), pp. 1-18. [10.3390/s20164406]
File allegati a questo prodotto
File Dimensione Formato  
Fortunato_Flexible ecoflex_2020.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Creative commons
Dimensione 6.95 MB
Formato Adobe PDF
6.95 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1462138
Citazioni
  • ???jsp.display-item.citation.pmc??? 10
  • Scopus 25
  • ???jsp.display-item.citation.isi??? 23
social impact