Ag nanoparticles formed by femtosecond pulse laser ablation in water: self assembled fractal structures
- Santillán, Jesica María José
- Fernandez Van Raap, Marcela Beatriz
- Mendoza Zélis, Pedro
- Coral, Diego Fernando
- Muraca, Diego
- Schinca, Daniel Carlos
- Scaffardi, Lucia Beatriz
DOIAbstract
We report for the first time on the formation of self-assembled fractals of spherical Ag nanoparticles (Nps) fabricated by femtosecond pulse laser ablation of a solid silver target in water. Fractal structures grew both in two and three Euclidean dimensions (d). Ramified-fractal assemblies of 2 nm height and 5–14 μm large, decorated with Ag Nps of 3 nm size, were obtained in a 2d geometry when highly diluted drops of colloidal suspension were dried at a fast heating rate over a mica substrate. When less-diluted drops were dried at slow heating rate, isolated single Nps or rosette-like structures were formed. Fractal aggregates about 31 nm size in 3d geometry were observed in the as-prepared colloidal suspension. Electron diffraction and opt...
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