The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

Yun Zhao - One of the best experts on this subject based on the ideXlab platform.

M. Sasani Ghamsari - One of the best experts on this subject based on the ideXlab platform.

  • Lead Sulfide colloidal nanocrystals with strong optical nonlinearity
    Optical and Quantum Electronics, 2017
    Co-Authors: M. Sasani Ghamsari
    Abstract:

    Colloidal PbS nanocrystals have been synthesized by a developed procedure. UV–Vis absorption and Z-scan technique was also applied to study the nonlinear optical properties of prepared Lead Sulfide nanocrystals at 532 nm wavelength. The nonlinear refractive (n2) and absorption (β) were determined which are confirming the strong nonlinearity at 532 nm of colloidal PbS nanocrystals. The obtained results have not been reported before. In this study, only a weak thermal optical nonlinearity was observed and the dominating nonlinear response is resulted by the electronic origin. The nonlinear optical properties of prepared sample supported wide applications in nanophotonics.

  • Colloidal Lead Sulfide nanocrystals with strong green emission
    Journal of Luminescence, 2013
    Co-Authors: M. Sasani Ghamsari, M.h. Majles Ara, Shahidan Radiman, X. H. Zhang
    Abstract:

    Abstract Facile colloidal technique was used to synthesize PbS nanocrystals. Surface functionalization and size control of the prepared Lead Sulfide nanocrystals was achieved by PVA. In order to evaluate the novelty of optical properties of the prepared sample, absorption, photoluminescence and time resolved photoluminescence studies was carried out. The size and morphology of PbS nanocrystals were also studied by HRTEM. Our investigation showed that the synthesized sample has strong green emission that has not been reported before. Time evolution of green emission has been analyzed after one and five months. The obtained results confirmed that the synthesized sample has high potential for biological applications.

  • Preparation and Characterization of the Lead Sulfide Nanostructured Thin Film
    AIP Conference Proceedings, 2008
    Co-Authors: M. Sasani Ghamsari, Shahidan Radiman, M. Ambar Yarmo, Muhammad Azmi Abdul Hamid, A. Bananej
    Abstract:

    Lead Sulfide nanostructured thin film was prepared from colloidal Lead Sulfide nanoparticles with natural deposition technique. The size of PbS nanoparticles has been determined in the base of optical absorption spectrum. The influence of preparation method on the film surface morphology was studied by atomic force microscopy, and x‐ray diffraction. Experimental results have shown that the thin film uniformity has been improved when the number of deposited layer increased. Double layered PbS nanothin film has a self assembly morphology and can be used for surface plasmon applications.

  • THE INFLUENCE OF HYDRAZINE HYDRATE IN THE PREPARATION OF Lead Sulfide THIN FILM
    2005
    Co-Authors: M. Sasani Ghamsari, M Khosravi Araghi
    Abstract:

    In this paper a chemical deposition procedure for the preparation of Lead Sulfide thin film is presented. The details of the preparation method are described. The influence of hydrazine hydrate on the microstructure and deposition rate of Lead Sulfide thin film has been investigated. The concentration of the Lead ions in the deposition bath decreases more slowly when the hydrazine hydrate is added. In the presence of hydrazine hydrate the predominance of (111) as the orientation of film growth is established. Optical absorption spectra, AFM and SEM micrograph have shown that the film was formed from nanometer grains.

Pengyu Zeng - One of the best experts on this subject based on the ideXlab platform.

S. I. Sadovnikov - One of the best experts on this subject based on the ideXlab platform.

  • Nanostructured Lead Sulfide PbS
    Nanostructured Lead Cadmium and Silver Sulfides, 2018
    Co-Authors: S. I. Sadovnikov, Andrey A. Rempel, Aleksandr I. Gusev
    Abstract:

    Lead Sulfide is a representative of the abundant family of semiconducting chalcogenides Chalcogenide . Lead Sulfide PbS is a single compound existing in the Pb–S system.

  • Nanostructured Lead Sulfide PbS
    Nanostructured Lead Cadmium and Silver Sulfides, 2017
    Co-Authors: S. I. Sadovnikov, Andrey A. Rempel, Aleksandr I. Gusev
    Abstract:

    Lead Sulfide is a representative of the abundant family of semiconducting chalcogenides. Lead Sulfide PbS is a single compound existing in the Pb–S system.

  • Hydrochemical precipitation of nanocrystalline Lead Sulfide powders
    Inorganic Materials, 2015
    Co-Authors: S. I. Sadovnikov, Aleksandr I. Gusev
    Abstract:

    Single-phase nanocrystalline PbS powders have been synthesized from aqueous solutions of Lead nitrate and Lead acetate, using sodium Sulfide as a sulfur source and sodium citrate or Trilon B as a complexing agent. The average particle size of the Lead Sulfide in the synthesized nanopowders depends on the nature of the complexing agent and its concentration. Our results demonstrate the possibility of controlled precipitation of PbS nanoparticles with a preset size in the range from 5–6 to 100 nm.

  • Effect of particle size on the thermal expansion of nanostructured Lead Sulfide films
    Journal of Alloys and Compounds, 2014
    Co-Authors: S. I. Sadovnikov, Aleksandr I. Gusev
    Abstract:

    Abstract The effect of particle size on the thermal expansion of nanostructured Lead Sulfide films produced by hydrochemical deposition has been studied. The coherent scattering region size and thermal expansion coefficients of PbS nanofilm have been measured depending on the annealing temperature in the interval 293–473 K and on the duration of annealing at a constant temperature of 423 K. It is found that the thermal expansion coefficient α of nanostructured PbS film is nearly twice as large as that of bulk Lead Sulfide. It is shown that the observed large difference in the coefficients α is due to the small size of PbS particles in the film that Leads to the change of the phonon spectrum boundaries and to the growth of anharmonicity of atomic vibrations. The additional contribution to the thermal expansion coefficient caused by the small particle size in PbS nanofilm is estimated theoretically.

  • Preparation of nanocrystalline Lead Sulfide powder with controlled particles size
    Russian Journal of General Chemistry, 2014
    Co-Authors: S. I. Sadovnikov, A. I. Gusev
    Abstract:

    Lead Sulfide nanopowders have been prepared from aqueous solutions of Lead acetate and sodium Sulfide in the presence of sodium ethylenediaminetetraacetate or citrate. From microscopy and X-ray diffraction data purity and size of the formed nanoparticles are determined by the reagents concentrations, presence and nature of the complexing ligand, and the ratio of Lead ions concentration to that of the ligand. PbS nanoparticles of the predefined size ranged from 5 to 55 nm can be prepared by controlled hydrochemical precipitation.

Aleksandr I. Gusev - One of the best experts on this subject based on the ideXlab platform.

  • Nanostructured Lead Sulfide PbS
    Nanostructured Lead Cadmium and Silver Sulfides, 2018
    Co-Authors: S. I. Sadovnikov, Andrey A. Rempel, Aleksandr I. Gusev
    Abstract:

    Lead Sulfide is a representative of the abundant family of semiconducting chalcogenides Chalcogenide . Lead Sulfide PbS is a single compound existing in the Pb–S system.

  • Nanostructured Lead Sulfide PbS
    Nanostructured Lead Cadmium and Silver Sulfides, 2017
    Co-Authors: S. I. Sadovnikov, Andrey A. Rempel, Aleksandr I. Gusev
    Abstract:

    Lead Sulfide is a representative of the abundant family of semiconducting chalcogenides. Lead Sulfide PbS is a single compound existing in the Pb–S system.

  • Hydrochemical precipitation of nanocrystalline Lead Sulfide powders
    Inorganic Materials, 2015
    Co-Authors: S. I. Sadovnikov, Aleksandr I. Gusev
    Abstract:

    Single-phase nanocrystalline PbS powders have been synthesized from aqueous solutions of Lead nitrate and Lead acetate, using sodium Sulfide as a sulfur source and sodium citrate or Trilon B as a complexing agent. The average particle size of the Lead Sulfide in the synthesized nanopowders depends on the nature of the complexing agent and its concentration. Our results demonstrate the possibility of controlled precipitation of PbS nanoparticles with a preset size in the range from 5–6 to 100 nm.

  • Effect of particle size on the thermal expansion of nanostructured Lead Sulfide films
    Journal of Alloys and Compounds, 2014
    Co-Authors: S. I. Sadovnikov, Aleksandr I. Gusev
    Abstract:

    Abstract The effect of particle size on the thermal expansion of nanostructured Lead Sulfide films produced by hydrochemical deposition has been studied. The coherent scattering region size and thermal expansion coefficients of PbS nanofilm have been measured depending on the annealing temperature in the interval 293–473 K and on the duration of annealing at a constant temperature of 423 K. It is found that the thermal expansion coefficient α of nanostructured PbS film is nearly twice as large as that of bulk Lead Sulfide. It is shown that the observed large difference in the coefficients α is due to the small size of PbS particles in the film that Leads to the change of the phonon spectrum boundaries and to the growth of anharmonicity of atomic vibrations. The additional contribution to the thermal expansion coefficient caused by the small particle size in PbS nanofilm is estimated theoretically.