Journal of Nanoparticle Research

, Volume 10, Issue 4, pp 567–575

Fascinating morphologies of lead tungstate nanostructures by chimie douce approach

Authors

  • Thresiamma George
    • School of Chemical SciencesMahatma Gandhi University
  • Sunny Joseph
    • School of Chemical SciencesMahatma Gandhi University
  • Anu Tresa Sunny
    • School of Chemical SciencesMahatma Gandhi University
    • School of Chemical SciencesMahatma Gandhi University
Research Paper

DOI: 10.1007/s11051-007-9285-8

Cite this article as:
George, T., Joseph, S., Sunny, A.T. et al. J Nanopart Res (2008) 10: 567. doi:10.1007/s11051-007-9285-8

Abstract

Lead tungstate occurs in nature as tetragonal stolzite of scheelite (CaWO4) type and monoclinic raspite. In this work, we report, the typical growth of snowflake-like tetragonal stolzite and bamboo-leaf-like monoclinic raspite nanocrystals of PbWO4 via a simple aqueous precipitation method and a polyol (polyethylene glycol-200) mediated precipitation method at room temperature (27 °C). The synthesised PbWO4 nanocrystals were characterised by XRD, SEM, EDAX and TGA–DTA. The UV-Vis absorption and photoluminescence studies of PbWO4 nanocrystals in the two morphologies were performed. The nuclei of PbWO4 nanocrystals in aqueous medium self-assemble in a tetragonal manner to form the snowflake-like crystals. In polyol medium, PbWO4 nuclei preferentially grow by oriented attachment process to form the bamboo-leaf-like morphology. The specific morphology of the regularly assembled PbWO4 nanocrystals in the two phases finds applications in nanoelectronics and photonics. Compared to other well-known scintillators, PbWO4 is most attractive for high-energy physics applications, because of its high density, short decay time and high irradiation damage resistance.

Keywords

Nanostructures Soft chemistry Luminescence Lead tungstate Band gap Colloids Nanostructure architecture

Copyright information

© Springer Science+Business Media B.V. 2007