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Fascinating morphologies of lead tungstate nanostructures by chimie douce approach

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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.

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Acknowledgements

We are grateful to Prof. T.N. Guru Row, SSCU, IISc, Bangalore and Dr. Peter Koshy of RRL Trivandrum for their valuable help rendered in structural characterization.

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  1. School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686 560, India

    Thresiamma George, Sunny Joseph, Anu Tresa Sunny & Suresh Mathew

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  1. Thresiamma George
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  2. Sunny Joseph
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  3. Anu Tresa Sunny
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  4. Suresh Mathew
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Correspondence to Suresh Mathew.

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George, T., Joseph, S., Sunny, A.T. et al. Fascinating morphologies of lead tungstate nanostructures by chimie douce approach. J Nanopart Res 10, 567–575 (2008). https://doi.org/10.1007/s11051-007-9285-8

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  • DOI: https://doi.org/10.1007/s11051-007-9285-8

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