Size Optimization of Iron Oxide@Noble Metal Core–Shell Nanohybrids for Photothermal Applications

The optical properties of several iron oxide@noble metal core–shell nanohybrids (NHs) have been systematically studied by means of electrodynamics simulations applying Mie theory for coated spheres. Focus has been made in analyzing the dependence of the absorption cross section Cabs on the composition as well as on the variables that determine the NHs size, that is, the core radius, R, and the shell thickness, S. The absorption spectra are characterized by an intense peak attributed to a plasmon resonance mode for which the spectral position can be finely tuned in the Vis–NIR range according to the NH size and composition. The absorption cross-section peak intensity, Cabs,max, a key quantity regarding photothermal applications, also presents a strong dependence on the NH size and composition. In general, it is found that α-Fe2O3@Au and α-Fe2O3@Ag lead to larger Cabs,max values than Fe3O4@Au and Fe3O4@Ag core–shell NHs, which is attributed to the lower imaginary refractive index of α-Fe2O3 in comparison to...

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