Title
Vibrational properties of nitrogen-doped ultrananocrystalline diamond films grown by microwave plasma CVD Vibrational properties of nitrogen-doped ultrananocrystalline diamond films grown by microwave plasma CVD
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Chemistry
Source (journal)
Diamond and related materials. - Amsterdam
Volume/pages
16(2007) :12 , p. 2074-2077
ISSN
0925-9635
ISI
000251961400017
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Ultrananocrystalline diamond (UNCD) films grown in an argon-rich Ar/CH4/H2 microwave plasma with nitrogen gas added in amounts of 0%20% were studied by Raman spectroscopy with multiple excitation wavelengths in the range of 244647 nm and by optical absorption in UVvisible. The Raman spectra have demonstrated the presence of diamond, amorphous carbon and polyacetylene in the UNCD films. Analysis of vibrational and optical properties of amorphous carbon phase proves that nitrogen stimulates the transition from amorphous carbon into an ordered graphite-like structure with narrowed optical band gap, which is supposed to be responsible for the high electrical conductivity of the N-doped UNCD.
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