Evidence for trans-polyacetylene in nanocrystalline diamond films from H–D isotropic substitution experiments

Pfeiffer, R.; Kuzmany, H.; Salk, N.; Günther, B.
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4149
Academic Journal
Raman spectra of nanocrystalline diamond (NCD) films show a peak around 1140 cm[SUP-1] that is usually considered to be a fingerprint of a NCD phase in the sample. From recent studies, it was suggested that this line is due to trans-polyacetylene in the films. We present Raman spectra of deuterated NCD films produced from a D[SUB2]/CD[SUB4]/Ar plasma. In these spectra, the 1140 cm[SUP-1] mode has disappeared and a peak at 860 cm[SUP-1] has emerged. The downshift of the peak at 1140 cm[SUP-1] is taken as a proof for its origin from trans-polyacetylene.


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