Cryogenic graphitization of submicrometer grains embedded in nanostructured tetrahedral amorphous carbon films

A. Hu*, Issam Al Khesho, W. W. Duley, H. Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A growth mechanism for submicrometer grains in diamondlike carbon films has been investigated. Films were formed by laser deposition on quartz substrates at 20-573 K. Atomic force microscopy shows that films deposited at 20-100 K consist of a matrix assembled from 40 nm nanoparticles that further aggregate into 400-500 nm grains which become embedded in the matrix. Nanohardness measurements show that these embedded grains possess a lower hardness than that of the matrix. Electronic structure obtained from resonant Raman spectra shows a remarkable clustering of s p2 bonds in the s p3 bonded matrix. It is believed that the s p2 bonded phase is concentrated in these submicrometer grains. X-ray photoelectron spectra show that this segregated structure has an enhanced affinity for oxygen.

Original languageEnglish (US)
Article number084319
JournalJournal of Applied Physics
Issue number8
StatePublished - Nov 7 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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