Strain sensitivity in ion-implanted polymers

Giovanni Di Girolamo, Marcello Massaro, Emanuela Piscopiello, Emanuela Pesce, Ciro Esposito, Leander Tapfer, Marco Vittori Antisari

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

Ion implantation process was used to fabricate ultra-thin conducting films in inert polymers and to tailor the surface electrical properties for strain gauge applications. To this aim, polycarbonate substrates were irradiated at room temperature with low energy Cu+ ions of 60 keV at 1 μA/cm2 and with doses ranging from 1×1016 to 1×1017 ions/cm2. XRD and TEM measurements on the nanocomposite surfaces demonstrated the spontaneous precipitation of Cu nanocrystals at 1×1016 ions/cm2 fluence. These nanocrystals were located at about 50 nm - 80 nm below the polymer surface in accordance with TRIM calculations. Optical absorption spectra exhibited a surface plasmon resonance (SPR) at 2 cV, in accordance with the formation of Cu nanoparticles. For doses of 5×1016 ions/cm2 the formation of a continuous nanocrystalline Cu subsurface film occurred and a well pronounced SPR peak was observed. Otherwise, for higher doses (1×10 17 ions/cm2) a damaged and structurally disordered film was obtained and the SPR peak was smeared out. Electrical conductivity measurements clearly indicated a reduced electrical resistance for the samples implanted with a doses up to 5×1016 ions/cm2 , whereas higher doses (1×1017 ions/cm2) resulted detrimental for the electrical properties, probably due to the radiation induced damage. The dependence of electrical resistance from surface load was evaluated during compression tests up to 3 MPa. A significant linear variation of the electrical resistance with the surface load was found and could be related to the changes in the spatial distribution of nanoparticles inside the copper film. © 2009 Materials Research Society.
Original languageEnglish
Publication statusPublished - Sep 2008
Externally publishedYes
Event2008 MRS Fall Meeting: Polymer-Based Smart Materials - Processes, Properties and Application - , United States
Duration: 1 Sep 2008 → …

Conference

Conference2008 MRS Fall Meeting: Polymer-Based Smart Materials - Processes, Properties and Application
CountryUnited States
Period1/9/08 → …

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Di Girolamo, G., Massaro, M., Piscopiello, E., Pesce, E., Esposito, C., Tapfer, L., & Antisari, M. V. (2008). Strain sensitivity in ion-implanted polymers. Paper presented at 2008 MRS Fall Meeting: Polymer-Based Smart Materials - Processes, Properties and Application, United States.