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Ultra-stretchable MWCNT–Ecoflex piezoresistive sensors for human motion detection applications

Journal Article


Abstract


  • Ultra-stretchable sensors are highly desirable for wearable electronic applications. In this paper, we manufactured self-standing piezoresistive sensors using a simple method based on blending multiwall carbon nanotubes (MWCNTs) with a stretchable elastomeric matrix (Ecoflex). The sensors showed a low electrical percolation threshold of 0.3 wt%, with an elastic modulus as soft as the human skin in the forearm and palm dermis. An increase in the cross-linking degree of the matrix from 17.43 ± 0.20 mol/m 3 up to 28.55 ± 2.07 mol/m 3 was observed with the incorporation of MWCNTs, revealing that the conductive filler is covalently bonded to the elastomeric matrix. The piezoresistive sensors showed high stretchability with an outstanding linearity between the resistance change with the applied strain, up to 200%, with significant sensitivity which is essential to use these sensors in human motion applications, e.g. finger bending, walking or speaking, and even detecting a hot liquid poured into a cup. Finally, MWCNT-Ecoflex sensors showed remarkable mechanical and electromechanical response features which are essential for wearable applications to monitor human motion with minimal discomfort.

Publication Date


  • 2019

Citation


  • Mai, H., Mutlu, R., Tawk, C., Alici, G. & Sencadas, V. (2019). Ultra-stretchable MWCNT–Ecoflex piezoresistive sensors for human motion detection applications. Composites Science and Technology, 173 118-124.

Scopus Eid


  • 2-s2.0-85061391164

Number Of Pages


  • 6

Start Page


  • 118

End Page


  • 124

Volume


  • 173

Place Of Publication


  • United Kingdom

Abstract


  • Ultra-stretchable sensors are highly desirable for wearable electronic applications. In this paper, we manufactured self-standing piezoresistive sensors using a simple method based on blending multiwall carbon nanotubes (MWCNTs) with a stretchable elastomeric matrix (Ecoflex). The sensors showed a low electrical percolation threshold of 0.3 wt%, with an elastic modulus as soft as the human skin in the forearm and palm dermis. An increase in the cross-linking degree of the matrix from 17.43 ± 0.20 mol/m 3 up to 28.55 ± 2.07 mol/m 3 was observed with the incorporation of MWCNTs, revealing that the conductive filler is covalently bonded to the elastomeric matrix. The piezoresistive sensors showed high stretchability with an outstanding linearity between the resistance change with the applied strain, up to 200%, with significant sensitivity which is essential to use these sensors in human motion applications, e.g. finger bending, walking or speaking, and even detecting a hot liquid poured into a cup. Finally, MWCNT-Ecoflex sensors showed remarkable mechanical and electromechanical response features which are essential for wearable applications to monitor human motion with minimal discomfort.

Publication Date


  • 2019

Citation


  • Mai, H., Mutlu, R., Tawk, C., Alici, G. & Sencadas, V. (2019). Ultra-stretchable MWCNT–Ecoflex piezoresistive sensors for human motion detection applications. Composites Science and Technology, 173 118-124.

Scopus Eid


  • 2-s2.0-85061391164

Number Of Pages


  • 6

Start Page


  • 118

End Page


  • 124

Volume


  • 173

Place Of Publication


  • United Kingdom