For optical manipulation, we were able to drag clusters of particles, and maybe also single particles, by a focused laser beam that acts as optical tweezers by inducing an electric dipole in the insulated metal nanoparticles. Luminescence can be detected in the near ultraviolet and the full visible spectral range by near infrared multi-photon excitation. However, we observe bright luminescence of labeled and even unlabeled magnetic core-shell nanoparticles with multi-photon excitation. In aqueous dispersion the NOPS fluorescence is quenched making them invisible using 1-photon excitation. To show the functionalization the fluorescent dye NOPS was bound to the FePt core-shell nanoparticles with propyl-triethoxy-silane linkers and fluorescence of the labeled particles were observed in ethanol (EtOH). The particles can be functionalized, optically detected, and optically manipulated. We present magnetic FePt nanoparticles with a hydrophilic, inert, and biocompatible silico-tungsten oxide shell. Multi-photon excited luminescence of magnetic FePt core-shell nanoparticles.
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