Journal
THIN SOLID FILMS
Volume 603, Issue -, Pages 323-327Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2016.02.053
Keywords
B-C-N thin films; Laser fluence; Bonding structure; Mechanical properties; Pulsed laser deposition
Categories
Funding
- National Natural Science Foundation of China [51272196, 51521001]
- 111 Project [B13035]
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Boron carbon nitride (B-C-N) thin films have been grown by pulsed laser deposition under different laser fluences changing from 1.0 to 3.0 J/cm(2). The influence of laser fluence on microstructure, bonding structure, and mechanical properties of the films was studied, so as to explore the possibility of improving their mechanical properties by controlling bonding structure. The bonding structure identified by FT-IR and XPS indicated the coexistence of B-N, B-C, N-C and N=C bonds in the films, suggesting the formation of a ternary B-C-N hybridization. There is a clear evolution of bonding structure in the B-C-N films with the increasing of laser fluence. The variation of the mechanical properties as a function of laser fluence was also in accordance with the evolution of B-C and sp(3) N-C bonds whereas contrary to that of sp(2) B-N and N=C bonds. The hardness and modulus reached the maximum value of 33.7 GPa and 256 GPa, respectively, at a laser fluence of 3.0 J/cm(2), where the B-C-N thin films synthesized by pulsed laser deposition possessed the highest intensity of B-C and N-C bonds and the lowest fraction of B-N and N=C bonds. (C) 2016 Elsevier B.V. All rights reserved.
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