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Properties of laser fabricated nanostructured Cu/diamond-like carbon composite

Published online by Cambridge University Press:  17 October 2011

Y.M. Foong ,
A.T.T. Koh ,
S.R. Lim ,
D.H.C. Chua  and
H.Y. Ng
Y.M. Foong
Affiliation:
Department of Materials Science & Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574, Singapore
A.T.T. Koh
Affiliation:
Department of Materials Science & Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574, Singapore
S.R. Lim
Affiliation:
Department of Materials Science & Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574, Singapore
D.H.C. Chua*
Affiliation:
Department of Materials Science & Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574, Singapore
H.Y. Ng
Affiliation:
Department of Civil & Environmental Engineering, Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore
*
a)Address all correspondence to this author. e-mail: msechcd@nus.edu.sg
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Abstract

Copper/diamond-like carbon (DLC) was fabricated using pulsed laser deposition, and the effects of copper on the properties of DLC composites were studied. Experimental results showed that the presence of copper promoted surface evolution through the formation of nanoclusters, accentuated the formation of Si–C but graphitized the diamond bondings of DLC matrix. By considering the interaction of laser with copper/carbon composite target, the presence of copper may have increased the energy absorbed during laser deposition, as envisaged by Saha’s equation. Thus, upon the impingement of ions on substrate during deposition, the carbon and silicon atoms may have been redistributed to form Si–C bonding while the excess energy was released as heat to promote the formation of nanoclusters but graphitize the sp3 bonding in DLC. Although sp3 bonding was reduced with the presence of copper, mechanical characterization showed that the adhesion strength of the composite films was approximately five times higher compared to undoped DLC, as a result of the decrease in internal stress and the formation of Si–C bondings in DLC.

Keywords

Laser ablationCompositeMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 21 , 14 November 2011 , pp. 2761 - 2771
Copyright
Copyright © Materials Research Society 2011

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