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Nanoparticle formation by the debris produced by femtosecond laser ablation of silicon in ambient air

Author:
Semaltianos, N. G.  Perrie, W.  Vishnyakov, V.  Murray, R.  Williams, C. J.  Edwardson, S. P.  Dearden, G.  French, P.  Sharp, M.  Logothetidis, S.  Watkins, K. G.  


Journal:
MATERIALS LETTERS


Issue Date:
2008


Abstract(summary):

The debris produced by fermosecond laser ablation (180 fs, 775 nm, 1 kHz) of Si in ambient air is deposited around the ablated craters in a circular zone with diameters between similar to 40 and 300 gm for laser fluences (F) in the region F=0.2-8 J/cm(2). The debris consists of nanoparticles. The mean height of the nanoparticles increases with laser fluence (from similar to 70 to 500 nm for fluences in the range F=0.25-4.38 J/cm(2)) but at high fluences (F= 8 J/cm(2)) becomes equal to similar to 170 nm. The average horizontal dimension of the nanoparticles increases with laser fluence. Their average vertical dimension increases in proportion to their average horizontal dimension, but at high fluences becomes much smaller than their corresponding average horizontal dimension. The nanoparticles were found to be single crystals with d spacing of 1.71 +/- 0.09 angstrom (corresponding to {311}). (C) 2007 Elsevier B.V. All rights reserved.


Page:
2165---2170


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