We have studied the effects of the laser fluence on the characteristics of Al nanoparticles produced by pulsed laser ablation of Al plate in deionized water without using surfactant. Five samples of aluminum nanoparticles were synthesized by nanosecond pulsed laser ablation of a high purity aluminum plate in distilled water at five different fluences in the range of 1-3 J/cm(2). There is threshold fluence of the laser at which absorption of laser energy by water rises significantly. Absorption of the laser energy by water leads to increase oxygen atoms in the ablation medium and formation of aluminum oxide nanoparticles. By increasing the laser fluence below the threshold magnitude size of produced nanoparticles increase while by increasing the laser fluence above the threshold magnitude size of produced nanoparticles decrease. The UV-Visible-NIR absorption spectra of nanoparticles exhibit surface plasmon resonance absorption peak in the ultraviolet region. TEM and SEM micrographs are used to characterize the produced nanoparticles. The production rate of nanoparticles is increased with increasing the laser fluence.
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