Thermodynamic stability of graphitic diamond films produced using CCVD apparatus

P. Mokwena, A. Marshall, A. S. Afolabi, A. S. Abdulkareem, S. E. Iyuke

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Diamond synthesis has attracted a great deal of interest because of its exceptional properties and various applications, In this study, the chemical catalytic vapour deposition (CCVD) method was used to synthesize diamond films using acetylene as carbon source and hydrogen as carrier gas at a temperature of 1000°C, and their thermodynamic stability was studied. Photographic analysis revealed that these products are diamond films, Ramman spectroscopy confirmed that they are graphitic while confocal laser scanning microscopic image analyses proved that these diamonds films have structural defects due to iron impurity from the catalyst precursor. The quantity of diamonds films produced is also proportional to the acetylene to hydrogen ratio but these films are larger in size at lower acetylene to hydrogen ratio. Thermogravimetric analyses showed that transformation of these materials begins at 25°C but could not be used to determine if a temperature range below 25°C exists. The stability of these CCVD-synthesized diamonds also increases below 25°C when stored at different temperatures.

Original languageEnglish
Pages (from-to)211-214
Number of pages4
JournalJournal of the Southern African Institute of Mining and Metallurgy
Volume107
Issue number4
Publication statusPublished - Apr 1 2007

Fingerprint

Vapor deposition
Diamond films
Acetylene
diamond
Thermodynamic stability
thermodynamics
Hydrogen
Diamond
acetylene
Diamonds
hydrogen
Temperature
Carbon
Iron
Gases
temperature
Spectroscopy
Impurities
Scanning
Defects

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

Cite this

Mokwena, P., Marshall, A., Afolabi, A. S., Abdulkareem, A. S., & Iyuke, S. E. (2007). Thermodynamic stability of graphitic diamond films produced using CCVD apparatus. Journal of the Southern African Institute of Mining and Metallurgy, 107(4), 211-214.
Mokwena, P. ; Marshall, A. ; Afolabi, A. S. ; Abdulkareem, A. S. ; Iyuke, S. E. / Thermodynamic stability of graphitic diamond films produced using CCVD apparatus. In: Journal of the Southern African Institute of Mining and Metallurgy. 2007 ; Vol. 107, No. 4. pp. 211-214.
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Mokwena, P, Marshall, A, Afolabi, AS, Abdulkareem, AS & Iyuke, SE 2007, 'Thermodynamic stability of graphitic diamond films produced using CCVD apparatus', Journal of the Southern African Institute of Mining and Metallurgy, vol. 107, no. 4, pp. 211-214.

Thermodynamic stability of graphitic diamond films produced using CCVD apparatus. / Mokwena, P.; Marshall, A.; Afolabi, A. S.; Abdulkareem, A. S.; Iyuke, S. E.

In: Journal of the Southern African Institute of Mining and Metallurgy, Vol. 107, No. 4, 01.04.2007, p. 211-214.

Research output: Contribution to journalArticle

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