LAUSR

Abstract Experimental results are presented on the interaction of gold nanoparticles (NPs) generated by laser ablation in water and nanoparticles of copper and aluminum phthalocyanine (PC) obtained by laser fragmentation in water. Such particles are characterized by chemical purity, in contrast to NPs synthesized using other techniques. It is found that addition of either AlPC or CuPC colloidal solutions to colloid of Au NPs causes the aggregation of Au NPs. This is confirmed by evolution of extinction spectra of colloids mixture and by Transmission Electron Microscopy. This effect is not observed under addition of the colloid of AlPC to Ag NPs also generated by laser ablation in water. Addition of PC colloids to the mixture of Au and Ag NPs leads to selective aggregation of only Au NPs. Possible mechanisms of aggregation of Au NPs upon mixing with PC NPs that have the dzeta-potentials of different signs are discussed.