Scattering&Spectroscopy
Universität Wien

Nanocrystalline Diamond

See also MEA-PPNCD

Tool Coating with Nanocrystalline Diamond

Coating of tools with nanocrystallin diamond reduces surface roughness and wear. Longer tool lifetime and reduced energy consumption for processing of hard and brittle work pieces are the consequence.

AFM image of macrocrystalline diamond (50 x 50 microns lateral resolution, 5.5 microns height)

AFM image of nanocrystalline diamond (20 x 20 microns lateral resolution)

SEM image of nanocrystalline diamond

The coating was performed in an especially constructed ellipsoidal reactor

References

1. Dieter M. Gruen. Nanocrystalline Diamond Films. Annu. Rev. Mater. Sci. 29, 211—259 (1999)
2. Walter A. Yarbrough and Russel Messier. Current Issues and Problems in the Chemical Vapor Deposition of Diamond. Science 247, 688—696 (1990).

The Raman spectrum of Crystalline and Nanocrystalline Diamond


Crystalline diamond:
Raman line at
1333 cm-1 Nanocrystalline diamond:
Raman lines at
1140 cm-1 (Diamant Precursor)
1200 cm-1 (C-N Schwingung)
1333 cm-1 (Diamant)
1350 cm-1 (Defekt Linie)
1490 cm-1 (ungeordnete sp2)
1580 cm-1 (Graphit)


The lines at 1140, 1350, und 1490 cm-1 are dispersiv

The Mystery of the Raman Line at 1140 cm-1 in Films of Nanocrystalline Diamond



Coating with deuterated source materials shows, that the Raman line at 1140 cm-1 originates from trans-polyacetylene.


1. R. Pfeiffer, H. Kuzmany, N. Salk, and B. Günther. Evidence for trans-polyacetylene in nanocrystalline diamond films from H-D isotropic substitution experiments.
Appl. Phys. Lett. 82, 4149—4150 (2003).

2. H. Kuzmany, R. Pfeiffer, N. Salk, and B. Günther. The mystery of the 1140 cm-1 Raman line in nanocrystalline diamond films.
Carbon 42, 911—917 (2004).