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1

Digitale Medien

Diamond film growth in a flowtube: A temperature dependence study (1991)

Martin, L. Robbin

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 70 (1991), S. 5667-5674

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Data are presented on the rate of diamond film growth in a flowtube at uniform temperature and pressure, and on the rate of H-atom decay in the tube during growth. Diamonds are grown by adding methane to a flow of atomic hydrogen in a carrier gas. The study covers temperatures from 600 to 900 °C, and a range of methane and H-atom concentrations. The profile of diamond growth rate in the tube is a measure of the gas-phase rise and decay of chemical species required for growth. A rudimentary computer model, fitted to the measured H-atom loss rates, is used to compare the gas-phase chemistry with the profiles. Using an assumed rate law for diamond growth, reasonable agreement with the data can only be obtained by including rapid, nonproductive wall loss of more than 95% of the methyl radicals. The data also suggest that methane (or methyl) increases the loss rate of H atoms, and that the converse is true: H atoms increase the loss rate of methyl radicals. Both processes are too fast to be accounted for by gas-phase chemistry. The model comparison yields an estimate for an activation energy of 19±10 kcal for the heterogeneous growth process. This number is meaningful only if the assumed rate law is correct.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.350183

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2

Digitale Medien

Diamond film synthesis in a chemically simplified system (1989)

Martin, L. Robbin ; Hill, Michael W.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 55 (1989), S. 2248-2249

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We have synthesized diamond films in a flow tube system in which methane is added downstream from a microwave discharge in 90% argon/10% hydrogen at 3 Torr. The chemistry in this system is simplified because the methane is not exposed to temperatures higher than the 850 °C wall temperature of the flow tube. Therefore, only the reaction of hydrogen atoms with methane initiates the chemistry of this system. Furthermore, the system is at uniform temperature and flow speed. Under these conditions, diamond is deposited on silicon substrates for a time of about 1 ms after injection of the methane.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.102072

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3

Digitale Medien

Does benzene inhibit diamond film growth? (1991)

Martin, L. Robbin ; Harris, Stephen J.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 59 (1991), S. 1911-1913

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Experiments were conducted to test the hypothesis that aromatic molecules inhibit the growth of diamond thin films. Small amounts of benzene vapor were added to a flowtube system for diamond film growth. In this system, diamonds are grown by adding methane or acetylene to a flow of atomic hydrogen at 800 °C. Mass spectrometric measurements verified that the benzene passed through the flowtube. No inhibition of the growth rate or decrease in the quality of the diamonds due to the presence of benzene was observed for either methane or acetylene.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.106186

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4

Digitale Medien

A flow-tube study of diamond film growth: methane versus acetylene (1990)

Martin, L. Robbin ; Hill, Michael W.

Springer

Journal of materials science 9 (1990), S. 621-623

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ISSN: 1573-4811

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00721783

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5

Digitale Medien

Chlorine atom and ClO wall reaction products (1979)

Martin, L. Robbin ; Wren, Anthony G. ; Wun, Marilyn

New York, NY : Wiley-Blackwell

International Journal of Chemical Kinetics 11 (1979), S. 543-557

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ISSN: 0538-8066

Schlagwort(e): Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The products of the heterogeneous reactions of chlorine atoms and chlorine oxide radicals with acid coated Pyrex walls have been directly determined for the first time. Contrary to the usual assumption that chlorine atoms recombine to form Cl2, we find that the major product is HCl, with small amounts of perchlorate also formed. Similarly, ClO radicals form HCl rather than Cl2. The source of hydrogen for these reactions is probably the water always found in this type of vacuum system. These results may change the interpretation of flow tube experiments with chlorine atoms. Application to the H + HCl reaction is discussed as an example.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/kin.550110507

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