Consiglio Nazionale delle Ricerche

Tipo di prodottoArticolo in rivista
TitoloFlexible Polydimethylsiloxane Foams Decorated with Multiwalled Carbon Nanotubes Enable Unprecedented Detection of Ultralow Strain and Pressure Coupled with a Large Working Range
Anno di pubblicazione2018
Autore/iIglio, Rossella; Mariani, Stefano; Robbiano, Valentina; Strambini, Lucanos; Barillaro, Giuseppe
Affiliazioni autoriIEIIT-CNR; Università di Pisa
Autori CNR e affiliazioni
  • inglese
AbstractLow-cost piezoresistive strain/pressure sensors with large working range, at the same time able to reliably detect ultralow strain (<= 0.1%) and pressure (<= 1 Pa), are one of the challenges that have still to be overcome for flexible piezoresistive materials toward personalized health-monitoring applications. In this work, we report on unprecedented, simultaneous detection of ultrasmall strain (0.1%, i.e., 10 mu m displacement over 10 mm) and subtle pressure (20 Pa, i.e., a force of only 2 mN over an area of 1 cm(2)) in compression mode, coupled with a large working range (i.e., up to 60% for strain-6 mm in displacement-and 50 kPa for pressure) using piezoresistive, flexible three-dimensional (3D) macroporous polydimethylsiloxane (pPDMS) foams decorated with pristine multiwalled carbon nanotubes (CNTs). pPDMS/CNT foams with pore size up to 500 mu m (i.e., twice the size of those of commonly used foams, at least) and porosity of 77%, decorated with a nanostructured surface network of CNTs at densities ranging from 7.5 to 37 mg/cm(3) are prepared using a low-cost and scalable process, through replica molding of sacrificial sugar templates and subsequent drop-casting of CNT ink. A thorough characterization shows that piezoresistive properties of the foams can be finely tuned by controlling the CNT density and reach an optimum at a CNT density of 25 mg/cm(3), for which a maximum change of the material resistivity (e.g., rho(0)/rho(50) = 4 at 50% strain) is achieved under compression. Further static and dynamic characterization of the pPDMS/CNT foams with 25 mg/cm(3) of CNTs highlights that detection limits for strain and pressure are 0.03% (3 mu m displacement over 10 mm) and 6 Pa (0.6 mN over an area of 1 cm(2)), respectively; moreover, good stability and limited hysteresis are apparent by cycling the foams with 255 compression-release cycles over the strain range of 0-60%, at different strain rates up to 10 mm/min. Our results on piezoresistive, flexible pPDMS/CNT foams pave the way toward breakthrough applications for personalized health care, though not limited to these, which have not been fully addressed to date with flexible strain/stress sensors.
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Pagine da13877
Pagine a13885
Pagine totali9
RivistaACS applied materials & interfaces (Print)
Attiva dal 2009
Editore: American Chemical Society - Washington, D.C.
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 1944-8244
Titolo chiave: ACS applied materials & interfaces (Print)
Titolo proprio: ACS applied materials & interfaces. (Print)
Titolo abbreviato: ACS Appl Mater Interfaces (Print)
Titoli alternativi:
  • ACS applied materials and interfaces (Print)
  • Applied materials & interfaces (Print)
Numero volume della rivista10
Fascicolo della rivista16
Verificato da referee-
Stato della pubblicazionePublished version
Indicizzazione (in banche dati controllate)
  • ISI Web of Science (WOS) (Codice:000431150900069)
Parole chiaveporous PDMS foams, carbon nanotubes, piezoresistivity, strain sensors, pressure sensors, flexible sensors, ultralow strain/pressure detection, large working range
Link (URL, URI)-
Titolo parallelo-
Data di accettazione-
Note/Altre informazioni-
Strutture CNR
  • IEIIT — Istituto di elettronica e di ingegneria dell'informazione e delle telecomunicazioni
Moduli CNR
    Progetti Europei-