Fig. 7. (a) Schematic approach used for the preparation of FePt–CdS heterodimers. (b) TEM images of FePt–CdS heterodimers. In the dimers the light gray dots were CdS, whereas the darker ones were FePt nanoparticles. Reproduced from ref. 103 with permission from American Chemical Society, copyright 2004. (c) TEM image of FePt@CdSe core–shell nanocrystals (HRTEM image in inset). Reproduced from ref. 105 with permission from American Chemical Society, copyright 2007. (d) TEM image of QD-magnetic beads core–shell nanoparticles. (e) HRTEM image of a single magnetic bead coated with QDs. Reproduced from ref. 106 with permission from American Chemical Society, copyright 2004.