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TEM images of (a) as-synthesized PbS–Ag2S NRs (growth time of 3 min) and (b) of the same sample aged for 55 min at 180 °C, showing conversion into spherical NPs. (c) HRTEM image of several spherical NPs; details of the red and green squared regions and their corresponding FFT. On the right, a colored structural map is presented, wherein the red color indicates an orthorhombic Ag2S phase and the green color indicates a face-centered cubic PbS phase.
