A study on fabrication, morphological and optical properties of lead sulfide nanocrystals

Jung-Hsuan Chen, Shen Chuan Lo, Chuen-Guang Chao, Tzeng-Feng Liu

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4 Scopus citations

Abstract

To investigate the properties of lead sulfide (PbS) nanocrystals, we have prepared PbS nanocrystals on/in the porous alumina membrane with a pore diameter 20 nm. Utilizing the reaction of Pb wires and the hydrogen sulfide (H2S) gas, PbS nanocrystals produced and grew as the reaction time increased. The composition identification of the nanocrystals was performed by the XPS and EDS analyses. More structure characteristics of the PbS nanocrystals obtained from the TEM analysis. As indicated in the PL spectra, an orange-red emission band appeared and the emission intensities were obviously related to the defects in the nanocrytals. A significant quantum confinement effect made the energy gap of PbS nanocrystals produce a blue shift from 0.41 eV to 1.89 eV. Furthermore, the growth mechanism of the PbS nanocrystals was also discussed.
Original languageEnglish
Pages (from-to)967-972
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume8
Issue number2
DOIs
StatePublished - Feb 2008

Keywords

  • lead sulfide; nanocrystals; alumina membrane; growth mechanism; quantum confinement effect
  • QUANTUM CONFINEMENT; NANOPARTICLES; NANOWIRES; NANOTUBES; DOTS; CDS

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