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Science 18 March 1994:
Vol. 263. no. 5153, pp. 1596 - 1598
DOI: 10.1126/science.263.5153.1596
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Articles

Growth of Diamond from Atomic Hydrogen and a Supersonic Free Jet of Methyl Radicals

Szetsen Steven Lee 1, David W. Minsek 1, Daniel J. Vestyck 2, and Peter Chen 1

1 Mallinckrodt Chemical Laboratory, Harvard University, Cambridge, MA 02138, USA.
2 Code 6174, Naval Research Laboratory, Washington, DC 20375, USA.

The growth of small (sim10-micrometer) diamond particles (on 0.1-or 0.25-micrometer seed crystals) using an effusive glow discharge nozzle for H·and a separate supersonic pyrolysis jet for ·CH3 is reported. Laser micro-Raman, scanning electron microscopy, and x-ray photoelectron spectroscopy data are presented as evidence that well-crystallized diamond is indeed formed. Resonant multiphoton ionization spectroscopy is used as a diagnostic for the gas-phase chemistry indicating that the radical sources are clean and quantitative and that there is no detectable interconversion of ·CH3 to C2H2 under the conditions of the experiment. Diamond growth is found at substrate temperatures greater than or equal to 650°C with no marked increase in the rate of growth up to 850°C. Acetylene does not give good quality diamond under similar conditions.

Submitted on October 26, 1993
Accepted on January 18, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A Reduction-Pyrolysis-Catalysis Synthesis of Diamond.
Y. Li, Y. Qian, H. Liao, Y. Ding, L. Yang, C. Xu, F. Li, and G. Zhou (1998)
Science 281, 246-247
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Science. ISSN 0036-8075 (print), 1095-9203 (online)