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Screening effect in gold nanoparticles generated in liquid by KrF ablation

Au nanoparticles (NPs) were prepared by laser ablation in liquid. Different solutions containing the NP were prepared by varying the pulse number (N) and the fluence (F) of a 248 nm KrF excimer laser. The absorption spectra of those solutions were studied. We observed that the concentration of the NP solution does not increase linearly with the ablation rate. This behavior is explained by the notion of a negative feedback effect. In this report, we discuss this notion and the influence of different solvents on the size and shape of the gold NPs. Finally, suitable experimental parameters to obtain nearly spherical NPs presenting diameters around 6 nm are defined.