Abstract
In this study, the trend of metal oxide hollow nanoparticles formation is experimentally inspected by a single nanosecond pulsed laser ablation of a bulk metal material in water and/or ethanol. Analysis results by transmission electron microscope indicate that the hollow formation can be completed or initiated by a single nanosecond laser pulse, dictated by the diffusive thermo-chemical and/or bubble-assisted assembly mechanisms, depending on the surrounding liquid medium and laser parameters. The results not only provide experimental clues to unveiling complex mechanisms involved with the hollow formation by the multiple laser shots but also will contribute to improving the hollow particle production efficiency.
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