Abstract
High quality PbS nanocrystals are synthesized reproducibly through lead stearate andsulfur stabilized by oleylamine in a non-coordinating solvent. The morphology,crystalline form and phase composition of PbS nanocrystals are examined bytransmission electron microscopy (TEM), high-resolution TEM, x-ray diffraction(XRD), energy-dispersive x-ray spectroscopy (EDS) and x-ray photoelectronspectroscopy (XPS). The as-synthesized PbS nanocrystals have strong absorptionand photoluminescence emissions in the near-infrared region. The size of PbSnanocrystals from 5 to 13 nm can be adjusted through the optimization of the synthesisconditions. The smaller PbS nanoparticles are obtained at the lower reactiontemperature, lower precursor concentration, larger oleylamine quantity and larger leadprecursor/sulfur ratio. The basic oleylamine enhances the reactivity of both lead stearate precursor andsulfur precursor in the reaction.
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