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Characterization and photoluminescence properties of MgO microtubes synthesized from hydromagnesite flowers
C. M. Janet, Balasubramanian Viswanathan, Ram Prasad Viswanath, Thirukkallam Kanthadai Varadarajan
Published in
Volume: 111
Issue: 28
Pages: 10267 - 10272
Monoclinic hydromagnesite (Mg5(CO3) 4·(OH)2·4H2O) flower-like structures of 2-3 μm diameter have been synthesized at room temperature by a simple precipitation method without using any template, catalyst, or surfactant. The as-synthesized flowers were further calcined at various temperatures to prepare monodispersed, nanofibrous MgO microtubes of aspect ratio ∼15. Both the precursor flowers and the MgO microtubes formed were characterized by powder XRD, TG-DTA, FT-IR, SEM, EDAX, HR-TEM, SAED, BET analysis and photoluminescence (PL) studies. A plausible mechanism for the formation of cubic MgO microtubes from monoclinic hydromagnesite flowers is proposed. The as-synthesized nanofibrous MgO microtubes have shown intense green and red emission. The more defective MgO microtubes formed in N2 atmosphere at 400°C showed the highest PL intensity and surface area. An attempt has been made to correlate the lattice parameter and the PL intensity. © 2007 American Chemical Society.
About the journal
JournalJournal of Physical Chemistry C
Open AccessNo
Concepts (9)
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    Catalyst activity
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    Precipitation (chemical)
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    Scanning electron microscopy
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    Surface active agents
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    Synthesis (chemical)
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    X ray diffraction analysis
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