Formation of bimetallic nanoparticles by pulsed laser ablation of multicomponent thin films in water

R. G. Nikov; N. N. Nedyalkov; A. S. Nikolov; P. A. Atanasov; M. T. Alexandrov; D. B. Karashanova

doi:10.1117/12.2175638

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8 January 2015 Formation of bimetallic nanoparticles by pulsed laser ablation of multicomponent thin films in water

R. G. Nikov, N. N. Nedyalkov, A. S. Nikolov, P. A. Atanasov, M. T. Alexandrov, D. B. Karashanova

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Proceedings Volume 9447, 18th International School on Quantum Electronics: Laser Physics and Applications; 94470M (2015) https://doi.org/10.1117/12.2175638
Event: Eighteenth International School on Quantum Electronics: Laser Physics and Applications, 2014, Sozopol, Bulgaria

Abstract

This study presents results on pulsed laser ablation of metallic and bimetallic thin films immersed in liquids. The thin films are deposited by classical on-axis pulsed laser deposition technology by using targets consisted of one or two sections composed of different metals. Using this technique gold, silver and gold/silver thin films are deposited on quartz substrate. By changing the area of the different sections of the target, thin films with different concentrations of the two metals are obtained. The as prepared films are then placed on the bottom of glass vessel filled with double distilled water and irradiated by nanosecond laser pulses delivered by Nd:YAG laser system operated at λ = 1064 nm. This results in fabrication of colloids composed by metallic and bimetallic nanoparticles. The performed TEM analyses revealed spherical and spherical-like shape of the particles produced. The optical extinction spectra of the obtained colloidal nanoparticles show plasmon excitations as the resonance wavelength can be efficiently tuned in a wide range by changing the ratio of the basic metals in the films.

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R. G. Nikov, N. N. Nedyalkov, A. S. Nikolov, P. A. Atanasov, M. T. Alexandrov, and D. B. Karashanova "Formation of bimetallic nanoparticles by pulsed laser ablation of multicomponent thin films in water", Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94470M (8 January 2015); https://doi.org/10.1117/12.2175638

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