The structural and optical constants of Ag2S semiconductor nanostructure in the Far-Infrared

Article English OPEN
Zamiri, Reza ; Ahangar, Hossein Abbastabar ; Zakaria, Azmi ; Zamiri, Golnoosh ; Shabani, Mehdi ; Singh, Budhendra ; Ferreira, J. M. F. (2015)
  • Publisher: BIOMED CENTRAL LTD
  • Journal: volume 9 (issn: 1752-153X, eissn: 1752-153X)
  • Related identifiers: pmc: PMC4471322, doi: 10.1186/s13065-015-0099-y
  • Subject: Raman spectroscopy | Chemistry(all) | Optical properties | Research Article | NANOPARTICLES | Crystal structure | SILVER | Nanostructures | Semiconductors | SULFIDE NANOCRYSTALS | Infrared spectroscopy

Background In this paper a template-free precipitation method was used as an easy and low cost way to synthesize Ag2S semiconductor nanoparticles. The Kramers–Kronig method (K–K) and classical dispersion theory was applied to calculate the optical constants of the prepared samples, such as the reflective index n(ω) and dielectric constant ε(ω) in Far-infrared regime. Results Nanocrystalline Ag2S was synthesized by a wet chemical precipitation method. Ag2S nanoparticle was characterized by X-ray diffraction, Scanning Electron Microscopy, UV-visible, and FT-IR spectrometry. The refinement of the monoclinic β-Ag2S phase yielded a structure solution similar to the structure reported by Sadanaga and Sueno. The band gap of Ag2S nanoparticles is around 0.96 eV, which is in good agreement with previous reports for the band gap energy of Ag2S nanoparticles (0.9–1.1 eV). Conclusion The crystallite size of the synthesized particles was obtained by Hall-Williamson plot for the synthesized Ag2S nanoparticles and it was found to be 217 nm. The Far-infrared optical constants of the prepared Ag2S semiconductor nanoparticles were evaluated by means of FTIR transmittance spectra data and K–K method. Graphical abstract The Far-infrared optical constants of Ag2S semiconductor nanoparticles.
  • References (26)
    26 references, page 1 of 3

    1. Kear B, Skandan G. Overview: status and current developments in nanomaterials. Int J Powder Metall. 1999;35:35-7.

    2. Bagwe RP, Khilar KC. Effects of intermicellar exchange rate on the formation of silver nanoparticles in reverse microemulsions of AOT. Langmuir. 2000;16:905-10.

    3. Zamiri R, Lemos A, Reblo A, Ahangar HA, Ferreira J. Effects of rare-earth (Er, La and Yb) doping on morphology and structure properties of ZnO nanostructures prepared by wet chemical method. Ceram Int. 2014;40:523-9.

    4. Qin D, Zhang L, He G, Zhang Q. Synthesis of Ag2S nanorods by biomimetic method in the lysozyme matrix. Mater Res Bull. 2013;48:3644-7.

    5. Joo J, Na HB, Yu T, Yu JH, Kim YW, Wu F, et al. Generalized and facile synthesis of semiconducting metal sulfide nanocrystals. J Am Chem Soc. 2003;12:11100-5.

    6. Gao F, Lu Q, Zhao D. Controllable assembly of ordered semiconductor Ag2S nanostructures. Nano Lett. 2003;3:85-8.

    7. Kashida S, Watanabe N, Hasegawa T, Iida H, Mori M, Savrasov S. Electronic structure of Ag2S, band calculation and photoelectron spectroscopy. Solid State Ion. 2003;158:167-75.

    8. Sadanga R, Sueno S. X-ray study on the α-β transition of Ag2S. Mineral J. 1967;5:124-43.

    9. S-y M. On the polarization of silver sulfide. J Phys Soc Jpn. 1955;10:786-93.

    10. Junod P, Hediger H, Kilchör B, Wullschleger J. Metal-non-metal transition in silver chalcogenides. Phil Mag. 1977;36:941-58.

  • Similar Research Results (1)
  • Metrics
    No metrics available
Share - Bookmark