Abstract
In this work we report the results of investigation of silver (Ag) nanoparticles prepared on a silica substrate by laser ablation. Our attention was focused on the mean diameter, size distribution and optical absorption properties of nanoparticles prepared in vacuum by using different laser wavelengths. The fundamental wavelength and the second, third, and fourth harmonics of a nanosecond Nd:YAG laser were used for nanoparticles fabrication. The corresponding values of the laser fluence for each wavelength were: 0.6 J/cm2 at 266 nm, 0.8 J/cm2 at 355 nm, 2.8 J/cm2 at 532 nm, and 2 J/cm2 at 1064 nm. The Ag nanoparticles produced have mean diameters in the range from 2 nm to 12 nm as the nanoparticles’ size decreases with the decrease of the wavelength used. The presence of the Ag nanoparticles was also evidenced by the appearance of a strong optical absorption band in the measured UV-VIS spectra associated with surface plasmon resonance (SPR). A redshift and widening of the absorption peak were observed as the laser wavelength was increased. Some additional investigations were performed in order to clarify the structure of the Ag nanoparticles.
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This work was supported in part by the Bulgarian National Science Fund under Contract No. DO 02-293/08.
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Dikovska, A.O., Alexandrov, M.T., Atanasova, G.B. et al. Silver nanoparticles produced by PLD in vacuum: role of the laser wavelength used. Appl. Phys. A 113, 83–88 (2013). https://doi.org/10.1007/s00339-013-7834-9
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DOI: https://doi.org/10.1007/s00339-013-7834-9