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Abstract

In our previous works, we observed the formation of Au-carbon nanoparticles via pulsed laser ablation (PLA) under pressurized CO2. We showed that the size of the generated nanoparticles depend strongly on the pressure and the temperature of the CO2 medium. Here, we further elaborate this finding by applying more extreme conditions for the CO2 medium. The experiments were performed at temperatures and pressures of 31-80 °C and 5-15 MPa, corresponding to the supercritical phase of CO2. We observed that the generated Au-carbon nanoparticles has the average size of 11 nm with spherical and nanocluster structures. The effects of the medium temperature and pressure will be discussed thoroughly.