Figure 3 LIBS spectra and emission lines. (a) LIBS spectra of In02PbTe for selected range from 300 to 466 nm. (b) LIBS indium emission lines at 410 nm for samples PbTe-2 (blue), In01PbTe (green), and In02PbTe (red), respectively. (c) LIBS indium emission lines at 325 nm for samples PbTe-2 (blue), In01PbTe (green), and In02PbTe (red), respectively. Figure  4 shows the SEM images of the PbTe

samples S63845 research buy prepared at 140°C and 200°C with different solvents, respectively. Figure  4a is the SEM image of the sample prepared with ethanol as the solvent at 140°C for 24 h which shows particles with appreciably uniform shape and average particle size of about 200 nm. However, with ethanol at 200°C for 24 h (Figure  4b), particles grow larger to an average size of about 300 nm. For comparison, Dorsomorphin in vivo the synthesis of PbTe samples was attempted with water as Doramapimod order the solvent. Figure  4c,d presents the SEM images of the PbTe samples synthesized with water as the solvent at 140°C and 200°C for 24 h, respectively.

From the images, it is clear that the PbTe samples formed with water as the solvent have chunks with various shapes and sizes. The PbTe sample prepared at 200°C for 24 h with water as solvent (Figure  4d) shows nano- to micron-sized spherical particles along with irregularly shaped particles. This result indicates that water alone is not sufficient for the formation of uniform small-sized PbTe nanoparticles. Figure  4e is the SEM image of the PbTe sample formed with water/glycerol (3:1 volume ratio) at 140°C for 24 h. It

shows clearly the fine particles with similar shape and a size in the range of 70 to 200 nm. The SEM image of the sample prepared with water/glycerol at 200°C for 24 h (Figure  4f) shows larger particles in the range of 200 to 500 nm in various shapes. The SEM results indicate that the particle size increases with the increase in the synthesis temperature when water/glycerol is used as solvent. From the SEM images, it can also be concluded that the combination of water and glycerol gives rise to nanoparticles with similar shape and small size compared to the use of alcohol or water alone as solvents. The use of ethanol or a water/glycerol mixture as solvent yields PbTe nanoparticles with uniform shape and size as compared with the PbTe particles prepared with only water. A report all by Zhu et al. [17] also suggests that solvothermal route of synthesis is more favorable than the hydrothermal one due to the strong polarity of the organic material in the solvothermal route which accelerates the dissolution of Te in the reaction process. Figure 4 SEM 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.