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Synthesis of Nanocrystalline Hexagonal Diamond Films in Organic Solvents by Femtosecond Laser Irradiation

Published online by Cambridge University Press:  01 February 2011

Anming Hu  and
Walt W. Duley
Anming Hu
Affiliation:
a2hu@uwaterloo.ca, University of Waterloo, Physics and Astronomy, 200 Univ. Ave. West, Waterloo, ON, N2L 3G1, Canada, 1-519-8884567-33620
Walt W. Duley
Affiliation:
wwduley@uwaterloo.ca, University of Waterloo, Physics, 200 Univ. Ave. West, Waterloo, ON, N2L 3G1, Canada
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Abstract

Nanocrystalline diamond films have been synthesized on various substrates by 800 nm fs laser irradiation of a variety of organic solvents including acetone, pentane, hexane, heptane, octane, dodecane, and hexadecane in the presence of a transition metal catalyst. 632 nm Raman spectra display a strong vibration mode at 1308 cm−1 characteristic of hexagonal diamond. X-ray photoelectron spectra confirm that the film is mainly sp3-bonded carbon containing a low concentration of sp2-bonded inclusions. Film microstructure shows that these films are assembled from nanoparticles having an average size of < 100 nm. Analysis of the liquid after irradiation using HPLC techniques indicates that polyyne molecules are also synthesized during irradiation. It is possible that these species are formed as the products of ion chemistry following Coulomb explosion. This process may enable a new method for the creation of nanocrystalline hexagonal diamond layers for micro-electronic and other applications.

Keywords

diamondlaser-induced reactionx-ray photoelectron spectroscopy (XPS)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1039: Symposium P – Diamond Electronics–Fundamentals to Applications II , 2007 , 1039-P15-08
Copyright
Copyright © Materials Research Society 2008

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