Figure 3.

TEM and SEM images of the samples. Samples synthesized with 3.6 × 10−3 M SDBS at the reaction temperature of 180°C under different duration times of (a) 3 h, (b) 6 h, and (c, d, and e) 12 h. (I to III) Schematic illustration of the evolution process of the PbS hopper cubic structures: from (I) primal octapod (corresponding to the object marked by blue circle in image e) to (II) transitional octapod (corresponding to the object marked by red circle in image e) to (III) final cube (corresponding to the object marked by yellow arrow in image e).

Cao et al. Nanoscale Research Letters 2012 7:668   doi:10.1186/1556-276X-7-668
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