Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 19, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-017-4009-1
Keywords
Fractals; Nanoparticles; Gold; Titanium oxide; Femtosecond lasers; Monte Carlo simulations; Diffusion model
Categories
Funding
- Cariplo Foundation grant Controlled nanostructures by low-cost non-thermal laser ablation on metals at atmospheric pressure
- Universita Cattolica del Sacro Cuore through D.2.2 grants
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In the synthesis of nanostructures by pulsed laser deposition (PLD), a crucial role is played by the environmental deposition pressure and the substrate temperature. Due to the high temperature of nanoparticles (NPs) at landing, other factors may determine the structure of the resulting aggregates. Here, Au and TiO2 nanostructures are obtained by non-thermal fs-PLD in ambient conditions. On Si(100), only TiO2 NPs form fractals with areas up to similar to 1 x 10(6) nm(2), while on quartz Au NPs also form fractals with areas up to similar to 5 x 10(3) nm(2), a much smaller size with respect to the TiO2 case. The aggregation is described by a simple diffusive model, taking into account isotropic diffusion of the NPs, allowing quantitative simulations of the NPs and fractal area. The results highlight the key role of substrate thermal conductivity in determining the formation of fractals.
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