Thermally induced sp2clustering in tetrahedral amorphous carbon (ta-C) films

J. O. Orwa, I. Andrienko, J. L. Peng, S. Prawer, Y. B. Zhang, Shu Ping Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)


Tetrahedral amorphous carbon films with 70%-88% sp3content are studied by atomic force microscopy (AFM), transmission electron microscopy (TEM), and Raman spectroscopy as a function of annealing temperature in the range 25-1100°C. Using a high-resolution AFM current imaging, we directly image the formation and growth of conducting graphitic (sp2-bonded) nanoclusters in the ta-C films. Overall results from all the techniques used show that the structural and electronic changes in the films depend sensitively on the initial sp3content. Cross-sectional TEM confirms that the clusters appear not only at the surface of the films but in the bulk as well. The growth and, perhaps, the partial orientation of the sp2-bonded nanoclusters in the size range of 1-3 nm is accompanied by a large reduction in the film stress, which decreases sharply in the temperature range 500-600°C.
Original languageEnglish
Pages (from-to)6286-6297
Number of pages12
JournalJournal of Applied Physics
Issue number11
Publication statusPublished - 1 Dec 2004
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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