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Structure and Mechanical Properties of Nitrogen Incorporated Diamond-Like Carbon Films

Published online by Cambridge University Press:  21 February 2011

Kwang-Ryeol Lee ,
Kwang Yong Eun  and
Jae-Seong Rhee
Kwang Yong Eun
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, P. 0. Box 131, Cheongryang, Seoul, Korea
Jae-Seong Rhee
Affiliation:
Advanced Analysis Center, Korea Institute of Science and Technology, P. 0. Box 131, Cheongryang, Seoul, Korea
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Abstract

Nitrogen incorporated diamond-like carbon (DLC) films were deposited by r.f. plasma assisted chemical vapor deposition (r.f.-PACVD) method. Mixtures of benzene and ammonia or nitrogen were used as the reaction gases for the deposition. Composition, atomic bond structure and mechanical properties of the film were investigated when the fraction of nitrogen source increases from 0 to 0.79. All films were deposited at fixed negative bias voltage of the cathode (-500 V) and the deposition pressure (10 mTorr). While ammonia addition reduces both residual stress and hardness of the film from 1.7 to 1 GPa and from 2750 to 1700 Kgf/mm2 respectively, the mechanical properties are not significantly varied by nitrogen addition. Deposition rate, composition and atomic bond structure are also dependent on the nitrogen source gases. Observed behavior of mechanical properties is discussed in terms of the content of inter-links of sp2 clusters. In addition to hydrogen, C≡N bonds in the film are also terminated sites of three dimensional atomic bond network. By considering the hydrogen concentration and the C≡N bonds, it can be shown that the mechanical properties of nitrogen incorporated DLC films are determined by the content of inter-links of sp2 clusters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 356: Symposium B2 – Thin Films: Stresses and Mechanical Properties V , 1994 , 233
Copyright
Copyright © Materials Research Society 1995

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