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The Influence of Diamond Surface Perfection on the Preferential Nucleation of SP2 Carbon During Methane Pyrolysis

Published online by Cambridge University Press:  25 February 2011

B. Y. Lin ,
C. P. Beetz ,
D. W. Brown  and
B. A. Lincoln
B. Y. Lin
Affiliation:
Advanced Technology Materials 7 Commerce Drive, Danbury, CT 06810
C. P. Beetz
Affiliation:
Advanced Technology Materials 7 Commerce Drive, Danbury, CT 06810
D. W. Brown
Affiliation:
Advanced Technology Materials 7 Commerce Drive, Danbury, CT 06810
B. A. Lincoln
Affiliation:
Advanced Technology Materials 7 Commerce Drive, Danbury, CT 06810
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Abstract

We report a set of CH4 pyrolysis experiments in a UHV system on diamond surfaces having varying degrees of surface roughness or perfection. Scanning electron microscopy (SEM), Auger electron spectroscopy (AES) and reflection high energy electron diffraction (RHEED) were used to examine the formation of graphite and the resulting surface morphologies. A (100) type Ha natural diamond having 3 sputtered craters on the surface was used as the substrate, sp2 carbon was formed preferentially on the structurally defective crater surfaces after ∼3×1010 L of CH4 exposure at 900°C, whereas essentially no sp2 carbon was found on the flat portions of the diamond surface. Similar experiments were also carried out on a polycrystalline CVD diamond film and sp2 carbon was formed on that surface afte ∼4×109 L of CH4 exposure at 900°C. These results indicate that structural defects on diamond surfaces are a crucial factor in the preferential nucleation of sp2 carbon during CH4 pyrolysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 280: Symposium B – Evolution of Surface and Thin Film Microstructure , 1992 , 705
Copyright
Copyright © Materials Research Society 1993

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References

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