Figure 4From: Synthesis and structure of undoped and indium-doped thermoelectric lead telluride nanoparticlesSEM images of the PbTe samples prepared at 140°C and 200°C with different solvents. SEM images of undoped PbTe nanoparticles prepared without surfactants for 24 h in ethanol at (a) 140°C and (b) 200°C, in water at (c) 140°C and (d) 200°C, and in water/glycerol solution at (e) 140°C and (f) 200°C.Back to article page