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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Modulation Technique of Localized Surface Plasmon Resonance of Palladium Nanospheres by Coating with Titanium Dioxide Shell for Application to Photothermal Therapy Agent

Fig. 4

Photothermal conversion properties and stability against laser irradiation of Au/PdNSs/TiO2. (A) (a) The time-dependent temperature profiles of colloidal aqueous solutions of Au/PdNSs/TiO2 with concentrations of (1) 16, (2) 32, (3) 53, (4) 64, and (5) 80 μg/mL with the laser irradiation (808 nm, 1.8 W, irradiation period: 30 min). (b) Plots of maximum temperature rise against the concentration of Au/PdNSs/TiO2. (B) Temperature profiles of colloidal aqueous solution of Au/PdNSs/TiO2 and water as a reference under laser irradiation with 808 nm. (C) Time constant for heat transfer from the system was calculated by applying the linear time data from the cooling period versus negative natural logarithm of driving force temperature, which is obtained from (B). (D) Extinction spectra for Au/PdNSs/TiO2 before and after laser irradiation for ca. 90 min (inset: TEM image of Au/PdNSs/TiO2 after laser irradiation)

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