▎ 摘　　要

The effect of laser fluence on the characteristics of carbon nanostructures produced by pulsed laser ablation has been investigated. The beam of a Q-switched Nd:YAG laser of 1064 nm wavelength at 7 ns pulse width and different fluences was employed to irradiate the graphite target in distilled water. The X-ray diffraction pattern, transmission electron microscopy, field emission scanning electron microscopy, Raman spectrum, and linear absorption properties of carbon nanostructures were used to characterize the ablation products. Carbon nanoparticles beside the graphene nanosheets were observed due to variation of laser fluence. The results show that under our experimental condition with increasing laser fluence the amount of carbon nanoparticles in suspensions was increased while the amount of graphene nanosheets was decreased.