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Rapid Annealing Of Amorphous Hydrogenated CarbonReport describes experiments to determine effects of rapid annealing on films of amorphous hydrogenated carbon. Study represents first efforts to provide information for applications of a-C:H films where rapid thermal processing required. Major finding, annealing causes abrupt increase in absorption and concomitant decrease in optical band gap. Most of change occurs during first 20 s, continues during longer annealing times. Extend of change increases with annealing temperature. Researchers hypothesize abrupt initial change caused by loss of hydrogen, while gradual subsequent change due to polymerization of remaining carbon into crystallites or sheets of graphite. Optical band gaps of unannealed specimens on silicon substrates lower than those of specimens on quartz substrates.
Document ID
19890000364
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Alterovitz, Samuel A.
(NASA Lewis Research Center, Cleveland, OH.)
Pouch, John J.
(NASA Lewis Research Center, Cleveland, OH.)
Warner, Joseph D.
(NASA Lewis Research Center, Cleveland, OH.)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 7
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
LEW-14664
Accession Number
89B10364
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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