Fig. 4.

a Schematic illustration of the synthesis of 1D linear structure and 1D striped structure by partial cation exchange. b Color-composite energy-filtered TEM image of CdS-Cu₂S nanorods. The orange regions correspond to the Cd energy-filtered mapping, and the blue regions correspond to the Cu mapping. c HRTEM image of a CdS-Cu₂S nanorod. Reproduced with permission from Ref. [98]. Copyright 2009, American Chemical Society. d, e TEM images of transformed CdS-Ag₂S superlattices. Inset in e: Histogram of Ag₂S segment spacing. Reproduced with permission from Ref. [100]. Copyright 2007, Science Publishing Group