| Abstract
| - Core−shell nanostructures consisting of FePt magnetic nanoparticles as the core andsemiconducting chalcogenides as the shell were synthesized by a series of reactions in a one-pot procedure.Adding Cd(acac)2 as the cadmium precursor to a reaction mixture containing FePt nanoparticles affordedFePt@CdO core−shell intermediates. The subsequent addition of chalcogens yielded FePt@CdX core−shell nanocrystals (where X was S or Se). The reverse sequence of addition, i.e., adding X before Cd,resulted in spongelike nanostructures because the chalcogens readily formed nanowires in the solution.Transmission electron microscopy, energy-dispersive X-ray spectrometry, selected area electron diffraction,fluorescence spectroscopy, and SQUID were used to characterize the nanostructures. These core−shellnanostructures displayed superparamagnetism at room temperature and exhibited fluorescence withquantum yields of 2.3−9.7%. The flexibility in the sequence of addition of reagents, combined with thecompatibility of the lattices of the different materials, provides a powerful yet convenient strategy forgenerating sophisticated, multifunctional nanostructures.
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