Highly-efficient shock-wave diamond synthesis from fullerenes

Epanchintsev, O. G.; Zubchenko, A. S.; Korneyev, A.E.; Simonov, V. A.

doi:10.1016/s0022-3697(97)00066-8

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…Nanocrystalline cubic diamond with crystallite sizes of 5-12 nm could be synthesized from fullerene C60 at 20 GPa and 2000 1C using a multi-anvil apparatus [6]. Microcrystalline diamonds up to 6 mm were produced from fullerenes C60 to C150 using a shock-wave synthesis under pressures ranged 24-40 GPa [7]. In general, it needs solely superhigh pressure or high pressure (in several GPa) and high temperature for the phase transition of C60 to diamond.…”

Section: Introductionmentioning

confidence: 99%

Growth of diamond from fullerene C60 by spark plasma sintering

Zhang

Ahmed

Holzhüter

et al. 2012

Journal of Crystal Growth

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a b s t r a c tThe growth of diamond from fullerene C60 was studied by spark plasma sintering (SPS). The phases and microstructures were analyzed by Raman spectroscopy, Synchrotron X-ray, scanning electron microscopy and transmission electron microscopy. Experimental results show that C60 becomes unstable and can be directly transformed into diamond by SPS under a pressure of 50 MPa at temperatures above 1150 1C, without any catalyst being involved. Polycrystalline diamond crystals with sizes up to 250 mm and transition rate about 30 vol% are obtained at SPS temperature of 1300 1C. The mechanism indicates that the high fraction of sp 3 hybrids in the fullerene C60 and the generated plasmas in the SPS lead to its transformation into diamond at such low temperatures and pressures. The transformation from C60 to diamond is a direct transition process with a structural reconstruction of carbon atoms without intermediate phases being involved.

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Section: Introductionmentioning

confidence: 99%

Growth of diamond from fullerene C60 by spark plasma sintering

Zhang

Ahmed

Holzhüter

et al. 2012

Journal of Crystal Growth

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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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“…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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Highly-efficient shock-wave diamond synthesis from fullerenes

Cited by 11 publications

References 12 publications

Growth of diamond from fullerene C60 by spark plasma sintering

Growth of diamond from fullerene C60 by spark plasma sintering

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

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

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