CARBON NANOPARTICLES PREPARED BY LASER ABLATION IN LIQUID ENVIRONMENT

In the present study, carbon nanostructures were synthesized by laser ablation of graphite in de-ionized water. Q-switched Nd:YAG laser of 1064[Formula: see text]nm wavelength, 9[Formula: see text]ns pulse width, and different laser fluences (3.6, 5.4, 10.6, and 14.6[Formula: see text]J/cm 2 ) were utilized to irradiate the target. XRD measurements demonstrated the presence of the two carbon phases (002, 111) except for the sample prepared at 3.6[Formula: see text]J/cm 2 laser fluence; it showed disappearance of (002) phase. This result can be an indication of changing the phase of carbon nanomaterials when prepared at this fluence. TEM revealed that carbon nanoparticles had a spherical shape and were 10–90[Formula: see text]nm in size, while nanostructure carbon prepared at 3.6[Formula: see text]J/cm 2 has nanosheets 45[Formula: see text]mm in width and 275[Formula: see text]mm in length. The absorption of CNPs indicated the appearance of the absorption peak at about 305[Formula: see text]nm, which is attributed to the [Formula: see text]–[Formula: see text]* transition of the C [Formula: see text] O band. PL emission was decreased at the higher laser fluence (14.6[Formula: see text]J/cm 2 ) due to the quenching of the carbon nanoparticles luminescence.

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