Synthesis of large single crystal diamond using combustion-flame method

Donnet, Jean‐Baptiste; Oulanti, Hanae; Huu, T. Le; Schmitt, Marjorie

doi:10.1016/j.carbon.2005.06.041

Cited by 39 publications

(26 citation statements)

References 30 publications

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“…8 10 which has attracted many efforts until now. [11][12][13][14] Other techniques, such as pulsed laser deposition 15 and shock wave compression, 16 have also been developed. However, improvements on deposition rate and film quality, which strongly depend on the reaction processes, are highly desired.…”

Section: Introductionmentioning

confidence: 99%

Enhanced chemical vapor deposition of diamond by wavelength-matched vibrational excitations of ethylene molecules using tunable CO2 laser irradiation

Líu

Xie

Gao

et al. 2009

Journal of Applied Physics

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Wavelength-matched vibrational excitations of ethylene ͑C 2 H 4 ͒ molecules using a tunable carbon dioxide ͑CO 2 ͒ laser were employed to significantly enhance the chemical vapor deposition ͑CVD͒ of diamond in open air using a precursor gas mixture of C 2 H 4 , acetylene ͑C 2 H 2 ͒, and oxygen ͑O 2 ͒. The CH 2 -wag vibration mode ͑ 7 ͒ of the C 2 H 4 molecules was selected to achieve the resonant excitation in the CVD process. Both laser wavelengths of 10.591 and 10.532 m were applied to the CVD processes to compare the C 2 H 4 excitations and diamond depositions. Compared with 10.591 m produced by common CO 2 lasers, the laser wavelength of 10.532 m is much more effective to excite the C 2 H 4 molecules through the CH 2 -wag mode. Under the laser irradiation with a power of 800 W and a wavelength of 10.532 m, the grain size in the deposited diamond films was increased by 400% and the film thickness was increased by 300%. The quality of the diamond crystals was also significantly enhanced.

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Section: Introductionmentioning

confidence: 99%

Enhanced chemical vapor deposition of diamond by wavelength-matched vibrational excitations of ethylene molecules using tunable CO2 laser irradiation

Líu

Xie

Gao

et al. 2009

Journal of Applied Physics

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“…It has various advantages over other methods, such as high synthesis speed and the safety and low cost of the equipment used; these advantages are desirable in the industrial market. In the combustion flame method, the enlargement of the area of the synthesized diamond [5], the synthesis of large single-crystal diamond [6] and the synthesis of diamond films for application in electronic devices [7] have been investigated. However, to date, the factors affecting diamond synthesis remain to be determined and no means of precisely controlling this method has yet been established.…”

Section: Introductionmentioning

confidence: 99%

Step Synthesis Method for Diamond Films on Tungsten Carbide Substrate Surface by Combustion Flame

Takahashi

Kamiya

Ohyoshi

2011

Int.J.Soc.Mater.Eng.Resour.

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A combustion flame method enables the synthesis of diamond using acetylene-oxygen gas (C 2 H 2 /O 2 ) combustion flame in ambient air. Recently, tungsten carbide (WC) is used as cutting tools in the machining industry. In this study, diamond films were synthesized by combustion flame on WC surfaces. However, it was difficult to synthesize the diamond films on the WC substrate surfaces. Therefore, in order to synthesize the diamond film, a two-step synthesis method was proposed. In this method, the film surface temperature and the distance of the flame inner cone from the surface for each step are changed during the synthesis. The first step was setting the film temperature to 1273 K, the second step was setting to 1223 K. The distance of the flame inner cone from the surface was changed for each step (Case 1 ; the first step : d = 7.0 mm, the second step : d = 7.0 mm, Case 2 ; the first step : d = 7.0 mm, the second step : d = 7.5 mm, Case 3 ; the first step : d = 7.5 mm, the second step : d = 7.0 mm). In the Case 1 and 2, the delamination-free film was synthesized on the WC surfaces, and diamonds were synthesized. However, in the Case 3, the film delamination occurred, and good diamond films were not synthesized.

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“…1 3 which has attracted many efforts up to now. [4][5][6][7] Other techniques, such as pulsed laser deposition 8 and shock wave compression, 9 have also been developed. Although diamond films have been deposited by the above-mentioned methods, deposition rate and film quality, which strongly depend on the reactions, are still to be improved.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced resonant excitation of ethylene molecules in C2H4/C2H2/O2 reactions to enhance diamond deposition

Líu

Sun

Han

et al. 2009

Journal of Applied Physics

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Vibrational resonant excitation of ethylene ͑C 2 H 4 ͒ molecules using a carbon dioxide laser was employed to promote reactions in precursors of ethylene, acetylene ͑C 2 H 2 ͒, and oxygen to enhance diamond deposition. One of the vibrational modes ͑CH 2 wag mode, v 7 ͒ of the C 2 H 4 molecules was selected to achieve the resonant excitation in the reactions. Optical emission spectroscopy was used to study the effects of laser resonant excitation on the reactions for diamond deposition. The optical emissions of CH and C 2 species were enhanced with the laser excitation, indicating that there are more active species generated in the reactions. Thicknesses and grain sizes of the deposited films were increased correspondingly. Temperature calculations from the line set in the R-branch of CH emission spectra indicated that a nonthermal process is involved in the enhanced diamond deposition.

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Synthesis of large single crystal diamond using combustion-flame method

Cited by 39 publications

References 30 publications

Enhanced chemical vapor deposition of diamond by wavelength-matched vibrational excitations of ethylene molecules using tunable CO2 laser irradiation

Enhanced chemical vapor deposition of diamond by wavelength-matched vibrational excitations of ethylene molecules using tunable CO2 laser irradiation

Step Synthesis Method for Diamond Films on Tungsten Carbide Substrate Surface by Combustion Flame

Laser-induced resonant excitation of ethylene molecules in C2H4/C2H2/O2 reactions to enhance diamond deposition

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