Synthesis and characterization of PbS crystals via a solvothermal route

Li, Fēi; Huang, Xintang; Kong, Tao; Liu, Xueqin; Qin, Qing Hua; Li, Zhen

doi:10.1016/j.jallcom.2009.06.025

Cited by 16 publications

(8 citation statements)

References 28 publications

(28 reference statements)

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“…It means that the PL emission intensity depends strongly on the morphologies and sizes of the nanocrystals. The results are in accord with those reported in the literature [34].…”

Section: +supporting

confidence: 93%

Synthesis via an organic molten salt solvent route and characterization of PbS nanocrystals

Zhang

2011

Cryst. Res. Technol.

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In this paper, four petals flowers-like and quasi sphere-like PbS nanostructures were successfully synthesized by an environment friendly organic molten salt solvent (OMSS) route at 200 °C, with different sulfur sources, e.g. thiourea and sodium thiosulfate, respectively. The as-synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), UV-vis absorption spectrum and photoluminescence (PL) spectrum, respectively. It was shown that four petals flowers-like and quasi sphere-like PbS nanocrystals were formed. It was also demonstrated that the morphologies of PbS nanocrystals were significantly influenced by different sulfur sources. The ultravioletvisible absorption peaks of PbS nanocrystals exhibited a large blue-shift and the luminescence spectra had strong and broad emission bands centered at 488 nm and 492 nm. The possible formation mechanisms of the PbS nanostructures were discussed. The organic molten salt solvent (OMSS) method is preferable for synthesizing high-quality PbS nanocrystals.

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“…It means that the PL emission intensity depends strongly on the morphologies and sizes of the nanocrystals. The results are in accord with those reported in the literature [34].…”

Section: +supporting

confidence: 93%

Synthesis via an organic molten salt solvent route and characterization of PbS nanocrystals

Zhang

2011

Cryst. Res. Technol.

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“…A blend of these extraordinary properties makes PbS a very promising candidate for electroluminescent devices (Wang et al 1987). Recent approaches for the synthesis of PbO and PbS nanostructures include sonochemical methods, thermal decomposition, self-organization (Leontidis 2003), hydrothermal synthesis (Li et al 2009), homogeneous hydrolysis (Li et al 2007), electro deposition (Sharon et al 1997), and microwave heating (Ding et al 2003;Sun et al 2009). Utilization of PbO and PbS nanostructures for potential applications is strongly subjected to their thermal stability in air and inert atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of lead sulfide and lead oxide nano-crystalline materials

2017

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In this study, nano-crystalline lead sulfide (PbS) and lead oxide (PbO) were synthesized using hassle-free and cost-effective chemical route. Lead oxalate (PbC 2 O 4 ) precursor was thermally decomposed to obtain the nanocrystalline PbO, while PbS nanoparticles were synthesized by microwave irradiation on a mixture of PbC 2 O 4 precursor and sodium thiosulfate. Resulting materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, ultraviolet-visible (UV-Vis) spectrophotometry, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). XRD confirmed the tetragonal structure for PbO and face-centered cubic for PbS with average crystallite sizes varying from 20 to 30 nm for both materials. From UV-Vis spectra, direct band gap energies were calculated to be 2.51 and 2.23 eV for PbO and PbS, respectively. Various decomposition stages during heat treatment of PbO and PbS, as revealed by TGA/DSC, are discussed in detail.

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“…PbS, a material of interest with a narrow band gap energy (E g = 0.37 eV) and large excitation Bohr radius of 18 nm, [4][5][6][7] has been alloyed with many other binary sulfides to form variable band gap ternary semiconductors of the type Pb 1−x M x S (M = Cd, Mn, Sr) [8][9][10][11][12] over wide wavelength range. Considering that the band gaps of bulk PbS and bulk CdS are 0.37 and 2.4 eV, respectively, a bulk ternary alloy of the type Cd x Pb 1−x S should show a variation of the band gaps between the limiting values of 0.37 and 2.4 eV.…”

Section: Introductionmentioning

confidence: 99%

Mid-IR band gap engineering of CdxPb1−xS nanocrystals by mechanochemical reaction

Tan

Liu

2014

AIP Advances

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Composition-tunable ternary CdxPb1−xS nanocrystals (NCs) are very important materials for remote sensing and detecting in the infrared (IR) wavelength region. They are, however, almost exclusively prepared by wet chemical routes which lead to surface-capped nanoparticles. The surface capping molecules could move their absorption peaks from mid-IR to near IR wavelength region. However, surface clean CdxPb1−xS nanocrystals (NCs) would demonstrate intrinsic optical spectrum in the mid-IR region. Herein, we present a physical mechanical alloying (MA) process being applied to prepare tens of grams of surface clean CdxPb1−xS nanocrystals within the composition range of x = 0.0 to 0.4. The average particle size is smaller than 9 nm. The as-milled nanocrystals are chemically homogenous. The CdxPb1−xS nanocrystals show a continuous lattice contraction with Cd content. There is an exponential indirect band gap-composition relationship. This MA method shows the ability to continuously and precisely tune the band gap energies of ternary CdxPb1−xS semiconductor nanocrystals from mid-IR region (2638 nm) to NIR wavelength region (1240 nm) through chemical composition.

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Synthesis and characterization of PbS crystals via a solvothermal route

Cited by 16 publications

References 28 publications

Synthesis via an organic molten salt solvent route and characterization of PbS nanocrystals

Synthesis via an organic molten salt solvent route and characterization of PbS nanocrystals

Thermal stability of lead sulfide and lead oxide nano-crystalline materials

Mid-IR band gap engineering of CdxPb1−xS nanocrystals by mechanochemical reaction

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