Abstract
We demonstrate that the nanoparticle formation during laser ablation of metals by short (of a few tens of ps) laser pulses strongly depends on the concentration of surrounding gas. While, at vacuum conditions, nanoparticle formation shows very “sharp” atomic force microscope images of aggregated clusters, following with clear appearance of plasmon resonance on the absorption spectra of deposited films, an addition of gas particles starts to decrease the probability of cluster formation. This process shows a threshold for both helium (33 torr) and xenon (12 torr) above which no surface plasmon resonance and correspondingly no observable nanoparticles on the deposited surfaces were detected. The destruction of nanoparticle formation was attributed to the negative influence of surrounding gas particles on ablated particles aggregation.
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Ganeev, R.A., Boltaev, G.S., Tugushev, R.I. et al. Nanoparticle formation during laser ablation of metals at different pressures of surrounding noble gases. Appl. Phys. A 100, 119–123 (2010). https://doi.org/10.1007/s00339-010-5787-9
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DOI: https://doi.org/10.1007/s00339-010-5787-9