Mesoporous-structure Enhanced Photothermal Effect of Fe3O4 Superparticles@ mesoporous Silica

Fe3O4 superparticles@ mesoporous SiO2(Fe(3)O(4)SPs@ mSiO(2)) were synthesized by the wet chemical method. The nanocomposites exhibited superparamagnetic property. They can rapidly accumulate near a commercial permanent magnet and redisperse in the aqueous solution with gently shaking. The absorption of Fe(3)O(4)SPs@ mSiO(2) in the near-infrared region was increased due to the coating of SiO2. And thus, their photo. thermal effect was improved. The construction of mesoporous structure facilitated to raise the utilization of near. infrared light, resulting in a further improvement of the photothermal performance of the nanocomposites. Moreover, the thicker the shell of the mesoporous SiO2 was, the superior the photothermal effect of the nanocomposites became. The vitro cell experiments confirmed that Fe(3)O(4)SPs@ mSiO(2) can effectively kill the cancer cells under the near infrared light irradiation.