CC BY
7LP-I-8
Generation of nanoparticles of unique morphologies by laser ablation in liquids
G. Shafeev1
1Prokhorov General Physics Institute of RAS, Wave Research Center, Moscow, Russian Federation
The review of experimental results is presented on the morphology of nanoparticles generated by laser ablation in liquids. Single-step formation of elongated Au nanoparticles with high aspect ratio is described under laser ablation of a bulk Au target in aqueous solutions of divalent cations (Ca2+, Be2+, Mg2+, etc.). Extinction spectra of elongated Au nanoparticles in water are characterized by longitudinal plasmon resonance whose position depends on their aspect ratio and may protrude to near-infrared region of spectrum. External permanent magnetic field up to 7 Tesla causes orientation and further elongation of Au chains, which is attributed to interaction of magnetic field with that of longitudinal electrons oscillations.
Results are presented on the formation of core-shell nanoparticles (Co@Al, Fe@Al, Ti@Al) under laser exposure of the mixture of individual respective nanoparticles in ethanol. The mechanism of their formation is discussed from the viewpoint of difference in melting temperature of components. Possible applications of Al and Ti@Al nanoparticles for hydrogen storage are discussed.
