Diamond nanocrystals formed by direct implantation of fused silica with carbon

Orwa, J.O., Prawer, S., Jamieson, D.N., Peng, J.L., McCallum, J.C., Nugent, K.W., Li, Y.J., Bursill, L.A. and Withrow, S.P. 2001, Diamond nanocrystals formed by direct implantation of fused silica with carbon, Journal of applied physics, vol. 90, no. 6, pp. 3007-3018, doi: 10.1063/1.1388857.

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Title Diamond nanocrystals formed by direct implantation of fused silica with carbon
Author(s) Orwa, J.O.ORCID iD for Orwa, J.O. orcid.org/0000-0001-6041-6751
Prawer, S.
Jamieson, D.N.
Peng, J.L.
McCallum, J.C.
Nugent, K.W.
Li, Y.J.
Bursill, L.A.
Withrow, S.P.
Journal name Journal of applied physics
Volume number 90
Issue number 6
Start page 3007
End page 3018
Total pages 12
Publisher American Institute of Physics
Place of publication Melville, N.Y.
Publication date 2001-09-15
ISSN 0021-8979
Summary We report synthesis of diamond nanocrystals directly from carbon atoms embedded into fused silica by ion implantation followed by thermal annealing. The production of the diamond nanocrystals and other carbon phases is investigated as a function of ion dose, annealing time, and annealing environment. We observe that the diamond nanocrystals are formed only when the samples are annealed in forming gas (4% H in Ar). Transmission electron microscopy studies show that the nanocrystals range in size from 5 to 40 nm, depending on dose, and are embedded at a depth of only 140 nm below the implanted surface, whereas the original implantation depth was 1450 nm. The bonding in these nanocrystals depends strongly on cluster size, with the smaller clusters predominantly aggregating into cubic diamond structure. The larger clusters, on the other hand, consist of other forms of carbon such as i-carbon and n -diamond and tend to be more defective. This leads to a model for the formation of these clusters which is based on the size dependent stability of the hydrogen-terminated diamond phase compared to other forms of carbon. Additional studies using visible and ultraviolet Raman Spectroscopy, optical absorption, and electron energy loss spectroscopy reveal that most samples contain a mixture of sp2 and sp3 hybridized carbon phases.
Language eng
DOI 10.1063/1.1388857
Field of Research 091202 Composite and Hybrid Materials
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2001, American Institute of Physics
Persistent URL http://hdl.handle.net/10536/DRO/DU:30091888

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