Consideration Of Au-Carbon nanoparticles by laser ablation under supercritical CO₂

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.