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. 2016 Feb 18;116(18):10852–10887. doi: 10.1021/acs.chemrev.5b00739

Figure 23.

Figure 23

Model of the PbSe|CdSe core|shell NC structure evidencing the octahedral shape of the PbSe core (A). HR-TEM images of a PbSe|CdSe core|shell NC (B) and PbSe/CdSe Janus-like NCs (C). The latter are obtained after thermal annealing at 200 °C of initial core|shell NCs. The bottom-left particle clearly shows that the volume of the CdSe shell was significantly larger than that of the PbSe core, consequently the PbSe/CdSe heterointerface is considerably different from that observed for equal volume bihemispheres, in the sense that it is no longer a flat interface, as can be clearly observed for the two top-right NHCs. (D) The mechanism of the thermally induced structural transformation from core|shell to Janus-like NHC is schematically depicted. Reproduced from [Grodzinska, D.; Pietra, F.; van Huis, M. A.; Vanmaekelbergh, D.; de Mello Donega, C. Thermally induced atomic reconstruction of PbSe/CdSe core/shell quantum dots into PbSe/CdSe bihemisphere heteronanocrystals J. Mater. Chem. 2011, 21, 11556–11565]. Copyright 2011 American Chemical Society.