Piezoresistive polymeric composites were prepared by melt mixing of polypropylene (PP) with expanded graphite (EG) (10-15 wt%) and/or multiwalled carbon nanotubes (MWCNTs) (1-2 wt%). The composites were extruded at a temperature of 185 C, by adopting 2.5-10 rpm screw speeds, and fibres with diameters of 0.2, 1.5 and 3 mm, were obtained. An integrated piezoresistive sensor device was obtained by hot pressing the extruded fibres into two sandwiched PP panels. Structure and morphology of the carbon fillers (EG and MWCNTs) and of the fibres, were investigated by means of X-ray diffraction, optical microscopy, scanning electron microscopy (conventional and conductive SEM) and atomic force microscopy. Piezoelectric properties of fibres and sensor devices were detected through a set up made by a dynamometer, a potentiometer and a digital multimeter. It was shown, that mechanical deformations, due to the applied loads, affect remarkably the resistivity of the materials.

Carbon-based piezoresistive polymer composites: Structure and electrical properties

CRAVANZOLA, SARA;Haznedar, Galip;SCARANO, Domenica;ZECCHINA, Adriano;CESANO, Federico
2013

Abstract

Piezoresistive polymeric composites were prepared by melt mixing of polypropylene (PP) with expanded graphite (EG) (10-15 wt%) and/or multiwalled carbon nanotubes (MWCNTs) (1-2 wt%). The composites were extruded at a temperature of 185 C, by adopting 2.5-10 rpm screw speeds, and fibres with diameters of 0.2, 1.5 and 3 mm, were obtained. An integrated piezoresistive sensor device was obtained by hot pressing the extruded fibres into two sandwiched PP panels. Structure and morphology of the carbon fillers (EG and MWCNTs) and of the fibres, were investigated by means of X-ray diffraction, optical microscopy, scanning electron microscopy (conventional and conductive SEM) and atomic force microscopy. Piezoelectric properties of fibres and sensor devices were detected through a set up made by a dynamometer, a potentiometer and a digital multimeter. It was shown, that mechanical deformations, due to the applied loads, affect remarkably the resistivity of the materials.
62
October 2013
270
277
http://dx.doi.org/10.1016/j.carbon.2013.05.064
Multiwalled carbon nanotubes (MWCNTs); Exfoliated graphite (EG); Few-layer graphene; Polimer composite; Conductive fibres; Electrical properties; Piezoresistive properties; Piezoresistive fibres; Synergistic effects; Mechanical properties; ATOMIC-FORCE MICROSCOPY; Scanning electron microscopy; Low-potential SEM; Mapping of electrical properties
Sara Cravanzola; Galip Haznedar; Domenica Scarano; Adriano Zecchina; Federico Cesano
File in questo prodotto:
File Dimensione Formato  
Carbon-based piezoresistive polymer composites, Structure and electrical properties.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 1.94 MB
Formato Adobe PDF
1.94 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
AperTO_Carbon-based piezoresistive polymer composites, Structure and electrical properties.pdf

Accesso aperto con embargo fino al 13/06/2015

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 4.24 MB
Formato Adobe PDF
4.24 MB Adobe PDF Visualizza/Apri

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/2318/144458
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 85
  • ???jsp.display-item.citation.isi??? 80
social impact