Stability and recrystallization of PbS nanoparticles

Sadovnikov, S.; Kozhevnikova, N.; Rempel, A.
August 2011
Inorganic Materials;Aug2011, Vol. 47 Issue 8, p837
Academic Journal
The recrystallization and thermal stability of nanocrystalline lead sulfide have been studied by X-ray diffraction and scanning electron microscopy. PbS nanoparticles ranging in size from 10 to 20 nm were prepared by chemical precipitation from aqueous solutions. To assess the thermal stability of the size of PbS nanoparticles, the nanocrystalline powders were annealed in air or under dynamic vacuum (10 Pa) at a temperature varied from 433 to 930 K in 50-K steps. Annealing at temperatures of up to 700 K increases the particle size only slightly but relieves the lattice strain, suggesting that the nanocrystalline state of lead sulfide is thermally stable in this temperature range. The temperature range 700-900 K, where the particle size increases by a factor of 5-10, corresponds to the secondary recrystallization of nanocrystalline PbS. The temperature 700 K is half the melting temperature of macrocrystalline PbS, indicating that PbS nanoparticles have higher thermal stability in comparison with other nanomaterials.


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