A spark ablation device for generating nanoparticles comprising a spark generator； the spark generator comprising first and second electrodes, wherein the spark generator further comprises at least one power source which is arranged to be operative at a first energy level for maintaining a discharge between the first and second electrodes, which power source is arranged for repetitively increasing the energy of the discharge to a predetermined secondary level that is higher than the first energy level for ablating a portion of the electrodes.
