Study on the Optical Characteristics and Stability of Tiny Hollow Gold Nanoparticles Were Investigated

Abstract

Through a galvanic replacement reaction between Ag nano-templates and gold salt, small hollow Au nanoparticles (d ≈16 nm) with outstanding thermal stability and high photo-thermal conversion efficiency, which offer tremendous promise for use in photo-thermal cancer therapy, were created. The amount of gold salt used to tune the position of surface plasmon resonance (SPR) bands for these nanoparticles. The hydrophobic hollow nanostructures were enclosed with poly (maleic anhydride-alt-1-octadecene) – PMAO to make them water-dispersible. In an aqueous solution of NaCl with a concentration of up to 280 mM, the nanostructures were stable. After three rings of irradiation at 20 minutes per circle, the hollow gold nanoparticles (HGNPs) were heated using an 808 nm laser at various power densities. The results showed that they are extremely photo-thermal stable under a high power density laser up to 1.6 W cm2 (20 min continuous irradiation for each circle). The easy synthesis of tiny HGNPs with a plasmon peak in the near infrared region, colloidal and photo thermalstability and high capacity for photon energy conversion into heat make them a promising material for photo thermal and imaging applications.