Strontium doped calcium phosphate coatings on poly(etheretherketone) (PEEK) by pulsed electron deposition

Michele Bianchi, Lorenzo Degli Esposti, Alberto Ballardini, Fabiola Liscio, Matteo Berni, Alessandro Gambardella, Sander C.G. Leeuwenburgh, Simone Sprio, Anna Tampieri, Michele Iafisco

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Herein the preparation of Sr2 +-doped calcium phosphate (CaP) coatings on poly(etheretherketone) (PEEK) substrates by pulsed electron deposition (PED) was investigated. Hydroxyapatites (HA) substituted with tailored amounts of Sr2 + up to 9 wt% were synthesized to generate the deposition targets. Dense and uniform amorphous CaP films having Sr/Ca molar ratios close to that of targets were achieved. The roughness and the wettability of the bare PEEK were significantly enhanced after coating deposition. The presence of Sr2 + led to a slight increase of the particles size while it did not mainly affect the RMS of the coatings that consisted of nanostructured aggregates of globular shape. After a mild annealing treatment at 130 °C for 6 h, the amorphous coatings transformed into nanocrystalline HA films incorporating Sr2 + having Sr/Ca molar ratios close to those of the as-deposited films. The annealing did not affect the topography and the roughness of the coatings, while improved the hardness of the films un-doped and doped at low-extent. This study shows that PED is feasible technique to coat PEEK implants with CaP films with control over the Sr/Ca ratio, which could improve bone fixation and in vivo stability especially under osteoporotic conditions thanks to the anabolic effect of Sr2 +.

Original languageEnglish (US)
Pages (from-to)191-199
Number of pages9
JournalSurface and Coatings Technology
StatePublished - Jun 15 2017


  • Calcium phosphate
  • Hydroxyapatite
  • Osteoporosis
  • Poly(etheretherketone)
  • Pulsed electron deposition
  • Strontium

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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