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(A): Schematic representation of SPIO@AuNS. SPIO was coated with amorphous silica, which was then grown with a monolayer of gold on the shell. (B): A typical transmission electron microscope image of SPIO@AuNS. The particles had an average diameter of 90 nm. (C): Absorbance spectrum of SPIO@AuNS. Notice the high absorption at 650–900 nm, which is essential for photothermal ablation using a near-infrared laser.
