Nano Archive

Fascinating morphologies of lead tungstate nanostructures by chimie douce approach

George, Thresiamma and Joseph, Sunny and Sunny, Anu Tresa and Mathew, Suresh (2008) Fascinating morphologies of lead tungstate nanostructures by chimie douce approach. JOURNAL OF NANOPARTICLE RESEARCH, 10 (4). pp. 567-575. ISSN 1388-0764 (Print) 1572-896X (Online)

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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 (27C). 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.

Item Type:Article
Uncontrolled Keywords:nanostructures; soft chemistry; luminescence; lead tungstate; band gap; colloids; nanostructure architecture
Subjects:Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:1736
Deposited By:Farnush Anwar
Deposited On:15 Dec 2008 15:36
Last Modified:13 Jan 2009 10:20

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