Formation of Au fractal nanoclusters during pulsed laser deposition on highly oriented pyrolitic graphite

Growth dynamics of pulsed laser deposited Pt nanoparticles on highly oriented pyrolitic graphite substrates

“…Such an enhanced diffusion behavior is not surprising since the high mobility of the ablated species on the substrate is one of the specific features that distinguish PLD from other deposition methods. 7,14 Moreover, motion of metal adatoms over typical distances in the 4 -12 nm range has been reported for Au/ HOPG grown by PLD, 13 in agreement with the internanoparticle distance of 3 -11 nm measured from Fig. 1(a).…”

“…10, this growth mode seems to apply only for some materials grown under specific deposition conditions. Indeed, nucleation and coalescence of nanoparticles on substrates have been reported for different laser-ablated metals, including Au/glass, 11 Fe/ Cu͑111͒, 12 Au/highly oriented pyrolitic graphite (HOPG), 13 Fe/ Mo͑110͒, 14 and Ag/ Si. 15 The model currently proposed for Si nanoparticles fails to describe the growth of these systems.…”

Ag nanocluster synthesis by laser ablation in Ar atmosphere: A plume dynamics analysis

“…Among physical vapor deposition (PVD) techniques, that have been modified to produce nanostructured materials, in particular thin films, pulsed laser deposition (PLD) in a buffer gas is a promising approach to deposit nanoparticles of different materials over wide intervals of process conditions (Wang et al, 2007;Wolowski et al, 2007;Gamaly et al, 2000). In exemplary PLD depositions, including Au/glass (Irissou et al, 2003), Au/HOPG (Zenkevich et al, 2002), Ag/Si (Seal et al, 2003), Pt/HOPG (Dolbec et al, 2004) on the nucleation and coalescence of NPs on the substrate was reported. The synthesis of C nanoclusters in plumes propagating through He and Ar atmospheres at pressures up to 1 kPa was reported and modeled (Bolgiaghi et al, 2005), keeping into account the relevant role of ionization phenomena occurring in the interface region between the shock wave front and the buffer gas (Bailini et al, 2006a(Bailini et al, , 2006b.…”

Ag fractals formed on top of a porous TiO2 thin film

“…gold ”nanostars” . On the other hand, it has been suggested by several authors that if one can produce a fractal aggregate of nearly spherical metallic particles, the absorption spectrum broadens and can extend over a wide range of frequencies . In fact, it has been found that inducing fractal‐type aggregation in thin films can be a perspective technological tool for controlling the optical response of thin films containing plasmonic NPs .…”