Au nanoparticles and Au nanostars were successfully synthesized using sodium citrate reduction method and seed-mediated growth method,respectively.Transmission electron microscopy(TEM)and ultraviolet-visible spectrophotometry(UV-Vis)were employed to characterize the microstructures and optical properties of the samples.The photothermal conversion performance of Au nanoparticles and Au nanostars were compared using an infrared thermal image.Furthermore,with Staphylococcus aureus as the target,the photothermal killing effect of Au nanostars on bacteria was observed under near-infrared(808 nm)laser irradiation using scanning electron microscopy(SEM)test.The experimental results demonstrate that Au nanostars with anisotropic structures exhibit more superior photothermal conversion performance,thereby achieving effective killing of Staphylococcus aureus.
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