Towards a general concept of diamond chemical vapour deposition

Bachmann, Peter K.; Leers, D.; Lydtin, H.

doi:10.1016/0925-9635(91)90005-u

Cited by 514 publications

(179 citation statements)

References 37 publications

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“…1b). These results are consistent with the C-H-O phase diagram for carbon growth that shows increasing H with respect to C in the gas phase eventually suppresses solid carbon nucleation 19 .…”

Section: Resultssupporting

confidence: 89%

“…Second, the C:H:O ratio of ethanol is within the predicted composition range for solid carbon precipitation 19 and, by adding H 2 , the ratio can be systematically tuned from non-diamond to diamond phase growth. Finally, ethanol has a suitable vapour pressure, not too high, resulting in excessive soot formation, but not too low, preventing particle nucleation.…”

Section: Resultsmentioning

confidence: 99%

“…The microplasma process is comparable to PECVD and the combination of plasma dissociation and gas-phase chemistry may aid the nucleation of diamond-phase carbon analogous to chemical vapour deposition (CVD) diamond 19 . Similar to CVD, atomic hydrogen may kinetically etch the non-diamond sp 2 carbon and allow diamond-phase sp 3 carbon to grow 1 .…”

Section: Discussionmentioning

confidence: 99%

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Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

et al. 2013

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Clusters of diamond-phase carbon, known as nanodiamonds, exhibit novel mechanical, optical and biological properties that have elicited interest for a wide range of technological applications. Although diamond is predicted to be more stable than graphite at the nanoscale, extreme environments are typically used to produce nanodiamonds. Here we show that nanodiamonds can be stably formed in the gas phase at atmospheric pressure and neutral gas temperatures o100°C by dissociation of ethanol vapour in a novel microplasma process. Addition of hydrogen gas to the process allows in flight purification by selective etching of the non-diamond carbon and stabilization of the nanodiamonds. The nanodiamond particles are predominantly between 2 and 5 nm in diameter, and exhibit cubic diamond, n-diamond and lonsdaleite crystal structures, similar to nanodiamonds recovered from meteoritic residues. These results may help explain the origin of nanodiamonds in the cosmos, and offer a simple and inexpensive route for the production of high-purity nanodiamonds.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

et al. 2013

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“…30 This could be caused by either an interaction of molecular or atomic oxygen with the diamond surface, or by a change in gas-phase composition. To test the first hypothesis, the influence of the etching of carbon by O and O 2 via reactions ͑61͒-͑66͒ ͑Appendix B͒ has been compared to other etching routes.…”

Section: Comparison Of the Reaction Routesmentioning

confidence: 99%

A surface and a gas-phase mechanism for the description of growth on the diamond(100) surface in an oxy-acetylene torch reactor

Croon

Kleijn

Akker

et al. 1998

Journal of Applied Physics

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Okkerse, M., Croon, de, M. H. J. M., Kleijn, C. R., van den Akker, H. E. A., & Marin, G. B. M. M. (1998). A surface and a gas-phase mechanism for the description of growth on the diamond(100) surface in an oxyacetylene torch reactor. Journal of Applied Physics, 84(11), 6387-6398. DOI: 10.1063/1.368965 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. A gas-phase and a surface mechanism were developed, suitable for multidimensional simulations of diamond oxy-acetylene torch reactors. The gas-phase mechanism was obtained by reducing a 48 species combustion chemistry mechanism to a 27 species mechanism with the aid of sensitivity analysis. The surface mechanism for growth on monocrystalline ͑100͒ surfaces developed, was based on literature quantum-mechanical calculations by Skokov et al. It consists of 67 elementary reaction steps and 41 species, and contains CH 3 and C 2 H 2 as gas-phase growth precursors and atomic hydrogen and oxygen to etch carbon from the surface. The gas-phase and surface chemistry models were tested in one-dimensional simulations, yielding dependencies of the growth rate on feed composition and surface temperature that are in qualitative agreement with the experiments. A more detailed study of the surface chemistry showed that, compared to CH 3 , acetylene contributes very little to diamond growth. Furthermore, molecular and atomic oxygen do not affect the diamond surface as much as atomic hydrogen because of their low concentrations.

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“…Zhao et al 7 provided the diamond hydrothermal synthesis from the mixture of the glassy carbon, powdered nickel, diamond seeds and water at 800 o C and 1.4 kbar. From another hand, Bachmann et al 8 For diamond, it has been argued, that crystallization under P-T conditions, where diamond is actually thermodynamically unstable with respect to graphite, is possible due to kinetic factors 9,10 . Nanosize diamond particles have energetic preference upon graphitic particles of the same size and could be more stable at low P-T parameters (ref.1) [11][12][13] .…”

mentioning

confidence: 99%

Metastable Nanosized Diamond Formation from Fluid Systems

Simakov

2010

Nature Precedings

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The model of nanosized diamond particles formation at metastable P-T parameters from fluid is presented. It explains the specific of CVD diamond synthesis gases mixtures and hydrothermal growth of diamond at low P-T parameters as well as it explains the geneses of metamorphic and magmatic nano-and microdiamond in the shallow depth Earth rocks and the genesis of interstellar nanodiamond formations in the space.The optimal gases system compositions for metastable diamond formations have been long debated in many publications during the long period. Badziag et al. 1 came to the conclusion that nanometer-sized diamonds could be more stable than graphite when formed from hydrocarbons with a H/C ratio of more than 0.24.

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Towards a general concept of diamond chemical vapour deposition

Cited by 514 publications

References 37 publications

Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

A surface and a gas-phase mechanism for the description of growth on the diamond(100) surface in an oxy-acetylene torch reactor

Metastable Nanosized Diamond Formation from Fluid Systems

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