Improvement of mechanical properties of amorphous carbon films deposited on polycarbonate plastics

H. C. Ong, Robert P. H. Chang, N. Baker, W. C. Oliver

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Amorphous carbon films have been deposited on polycarbonate surfaces using laser ablation technique. The polycarbonate substrates were treated with oxygen plasma prior to film deposition. Mechanical properties of the films were examined as a function of plasma pretreatment time. Results showed that the mechanical behavior of the carbon film improved with pretreatment time. A one-hour pretreated sample exhibited no cracking, good adhesion, low stress and a hardness of 5 GPa which is 20 times higher than that of bare polycarbonate. Spectroscopic ellipsometry was used to characterize the film and interface properties in order to understand the effect of plasma on polycarbonate surface. Computer modeling of the ellipsometry data revealed that the improvement of mechanical behavior of the films is due to the modifications of the polycarbonate surfaces after the oxygen plasma treatment. Further correlation studies of surface modification by oxygen plasma was carried out by atomic force microscopy and stress measurement. Optical emission spectra from the plasma plume during laser ablation showed that the neutral and ionic carbon atoms were the dominant species. We believe their presence plays a major role in controlling the properties of our diamond-like carbon films.

Original languageEnglish
Pages (from-to)38-46
Number of pages9
JournalSurface and Coatings Technology
Volume89
Issue number1-2
Publication statusPublished - Feb 15 1997

Fingerprint

polycarbonate
Carbon films
Amorphous carbon
Amorphous films
polycarbonates
Polycarbonates
plastics
mechanical properties
Plastics
Plasmas
Mechanical properties
carbon
oxygen plasma
Laser ablation
Oxygen
pretreatment
laser ablation
ellipsometry
Diamond like carbon films
Spectroscopic ellipsometry

Keywords

  • Amorphous carbon film
  • Diamond-like carbon film
  • Oxygen plasma treatment
  • Polycarbonate plastic

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Improvement of mechanical properties of amorphous carbon films deposited on polycarbonate plastics. / Ong, H. C.; Chang, Robert P. H.; Baker, N.; Oliver, W. C.

In: Surface and Coatings Technology, Vol. 89, No. 1-2, 15.02.1997, p. 38-46.

Research output: Contribution to journalArticle

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