Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 12, Issue 2, Pages 573-580Publisher
SPRINGER
DOI: 10.1007/s11051-009-9625-y
Keywords
Silicon nanoparticles; Synthesis; Femtosecond laser ablation; Raman spectroscopy
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Funding
- Marie Curie European Reintegration Grant (ERG) [PERG03-GA-2008-226029, 83573]
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Silicon nanoparticles were generated by femtosecond laser [387 nm, 180 fs, 1 kHz, pulse energy = 3.5 mu J (fluence = 0.8 J/cm(2))] ablation of silicon in deionized water. Nanoparticles with diameters from similar to 5 up to similar to 200 nm were observed to be formed in the colloidal solution. Their size distribution follows log-normal function with statistical median diameter of approximate to 20 nm. Longer ablation time leads to a narrowing of the nanoparticle size distribution due to the interaction of the ablating laser beam with the produced nanoparticles. Raman spectroscopy measurements confirm that the nanoparticles exhibit phonon quantum confinement effects and indicate that under the present conditions of ablation they are partially amorphous.
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