Effect of PbS shell on the optical and electrical properties of PbSe core nanoparticles doped in PVA

Nanoparticles (NPs) of PbSe were synthesized in polyvinyl alcohol polymers with different Pb/Se ratio. It is crucial that the PbSe NPs were covered by a PbS sheet layer. Absorption and photoluminescence under excitation by 441.5 nm He-Cd laser were investigated. The structure of the nanocomposites was investigated using X-ray diffraction (XRD) measurements and transmission electronic microscopy (TEM). Conductivity measurements of the PbSe NP and PbSe/PbS sheets were performed. (c) 2006 Elsevier B.V. All rights reserved.