Substitution-induced structural transformation in Mn-doped ZnS nanorods studied by positron annihilation spectroscopy

    Authors

    S. Kar; S. Biswas; S. Chaudhuri;P. M. G. Nambissan

    Comments

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    Abbreviated Journal Title

    Nanotechnology

    Keywords

    MAGNETIC-PROPERTIES; NANOCRYSTALS; LIFETIME; SPECTRA; CARBON; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied

    Abstract

    Zinc sulphide nanorods were doped with manganese ions and the structural changes were monitored through positron annihilation measurements. X-ray diffraction and high-resolution transmission electron microscopy revealed a transformation from hexagonal to cubic structure, and we observed characteristic changes in the measured positron lifetimes, their intensities and Doppler broadened lineshapes. These features were explained on the basis of positron trapping and subsequent annihilation at the nanorod surfaces. Further incorporation of manganese resulted in an increase of the diameter of the nanorods, and the effect was reflected in the decreasing lifetime of positrons. At sufficiently high concentration of manganese ions, Mn - Mn clusters were formed. The results are compared with those obtained for ZnS nanoparticles where vacancies within the grains trapped a significant fraction of positrons.

    Journal Title

    Nanotechnology

    Volume

    18

    Issue/Number

    22

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    7

    WOS Identifier

    WOS:000246590400014

    ISSN

    0957-4484

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