On conductivity in lead chalcogenides

Kothiyal, G.P.; Ghosh, B.

doi:10.1016/0146-3535(90)90006-e

Cited by 3 publications

(7 citation statements)

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“…The band gap for bulk lead selenide is 0.27 eV, however, the band gap obtained for the lead selenide nanoparticles synthesised was 1.17 eV (Table ). This indicates a significant tuning of the band gap.…”

Section: Resultsmentioning

confidence: 99%

“…The band gap for bulk lead selenide is 0.27 eV and that for bulk PbS is 0.41 eV however, the band gap obtained for the nanoparticles synthesised from the mixed ligand complex was 1.38 eV. There is, therefore, a tremendous change between the bulk band gap and that obtained, indicating significant tuning.…”

Section: Resultsmentioning

confidence: 99%

“…The band gap obtained compares with that obtained from other works reported in literature . The band gap for bulk lead sulfide is 0.41 eV however, the band gap obtained for the lead sulfide nanoparticles synthesised was 1.03 eV. This indicates a significant tuning of the band gap.…”

Section: Resultsmentioning

confidence: 99%

“…[41] The wider band gaps reported for lead chalcogenides with sizes greater than their respective Bohr exciton radii may be as a result of transitions other than the first excitonic absorption peak. [24,42] The band gap for bulk lead selenide is 0.27 eV and that for bulk PbS is 0.41 eV [35] however, the band gap obtained for the nanoparticles synthesised from the mixed ligand complex was 1.38 eV. There is, therefore, a tremendous change between the bulk band gap and that obtained, indicating significant tuning.…”

Section: Lead Chalcogenide Nanoparticlesmentioning

confidence: 98%

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Hot‐Injection Synthesis of PbE (E= S, Se) Nanoparticles from Dichalcogenoimidophosphinato Lead (II) Complexes

et al. 2019

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Dichalcogenoimidodiphoshinato lead complexes, [Pb((EPiPr2)2N)2] (E=S, Se) have been synthesized and characterized. The crystal structure of [Pb((SeSPiPr2)2N)2]), has been solved by single‐crystal X‐ray crystallography and reported. These complexes have been used as single‐source precursors to synthesise PbS and PbSe nanoparticles by hot‐injection method in an oleylamine/trioctylphosphine mixture. Powder X‐ray diffraction (p‐XRD) studies indicate that the nanoparticles produced are cubic. The optical band gaps estimated from the absorption spectrum fitting curve indicate significant tuning of the bulk band gap, blue shifting towards the visible region of the electromagnetic spectrum.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Lead Chalcogenide Nanoparticlesmentioning

confidence: 98%

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Hot‐Injection Synthesis of PbE (E= S, Se) Nanoparticles from Dichalcogenoimidophosphinato Lead (II) Complexes

et al. 2019

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“…Semiconductor quantum dots (QDs) have been widely investigated, due to their quantum confinement properties, [1][2][3] phonon confinement features, 4,5 and potential for electronic and optoelectronics applications, 6 thermoelectric applications, 7,8 and solar cells. [9][10][11][12] PbTe QDs have attracted much attention with respect to their small band gap (0.32 eV at 300 K), 13 largest exciton Bohr radius 46 nm 14,15 among known crystalline semiconductor QDs, and large static dielectric constant of 360. 16 A typical PbTe QDs synthesis using lead acetate trihydrate as the Pb precursor, tri-n-octylphosphine telluride (TOPTe) as the Te precursor, TOP and oleic acid (OA) as the capping ligand, and phenyl ether as the non-coordinating solvent was first reported by Fang's group in 2004.…”

Section: Introductionmentioning

confidence: 99%

Size controlled synthesis of monodisperse PbTe quantum dots: using oleylamine as the capping ligand

et al. 2012

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We report a simple method to synthesize monodisperse hydrophobic PbTe quantum dots followed by a stability study of the as-synthesized quantum dots in air. We provide evidence that air-stable PbTe quantum dots can be synthesized using this method. PbCl 2 complexed with oleylamine was used as the Pb precursor. Tellurium powder dissolved in tri-n-octylphosphine was used as the Te precursor. Oleylamine was used as the only capping ligand. The size and shape of the PbTe quantum dots were controlled by changing variables such as injection temperature, growth temperature, and growth time. Both Pb to oleylamine and Pb to Te feed mole ratios have been examined to obtain the optimal synthetic conditions. The PbTe quantum dots can be changed from hydrophobic to hydrophilic through ligand exchange using 4-mercaptopyridine to replace oleylamine as the capping ligand. The colloidal PbTe quantum dots were characterized by transmission electron microscopy, high resolution transmission electron microscopy, selected area X-ray diffraction, energy-dispersive X-ray spectroscopy, FT-IR spectrometer, 31 PNMR spectrometer, and powder X-ray diffraction. The sizes of the PbTe quantum dots synthesized ranged from 2.6 nm to 14.

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