Size-tunable near-infrared PbS nanoparticles synthesized from lead carboxylate and sulfur with oleylamine as stabilizer

Abstract

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

Chemical Synthesis, Structure Characterization, and Optical Properties of Hollow PbSx–Solid Au Heterodimer Nanostructures

“…[23] The broad peaks of S 2p can be separated into two peaks at 163.5 eV and 162.3 eV, corresponding to S 2p1/2 and S 2p3/2, respectively. Notably, the values are much higher than the data reported for PbS in the literature ( % 160.7 eV for S 2p3/2), [21,24] but in good agreement with those documented for disulfides and/or polysulfides ( % 162.1 eV for S 2p3/2).…”

Facile synthesis of organically capped PbS nanoparticles

“…The results of the XRD patterns of the HDA and TOPO capped PbS nanocrystals prepared from Pb(NO 3 ) 2 indicate that samples were crystalline and the patterns are in good agreement with the bulk PbS crystal. The major diffraction peaks could be indexed as (1 1 1), (2 0 0), (2 2 0), (3 1 1), (2 2 2), (4 0 0), (3 3 1), (4 2 0), and (4 2 2) planes of cubic PbS, which is consistent with values reported in the literature [21,29,40].…”

“…These include hydrothermal and solvothermal methods [21,22], microwave-assisted heating [23], thermal decomposition methods [24], electrodeposition [25], templateand surfactant assisted methods [26,27] and hot injection precursor methods [17,[28][29][30][31]. The hot injection routes involve the injection of the lead salt and sulphur source into co-ordinating solvents.…”

Effect of ligands on the photoluminescence properties of water-soluble PbS quantum dots

“…Up to date, many kinds of QDs with different size, shape, and composition have been extensively investigated for not only their theoretical fundaments but also their practical applications [7][8][9]. As an important branch of QDs materials, the near-infrared emitting (NIR) QDs with emission range of 700-1300 nm are becoming increasingly attractive in the last 5 years [10][11][12]. This is because absorption and scattering by biological tissues is much reduced in this spectral window compared to the visible range.…”