Malaysian Journal of Analytical Sciences
Vol 18 No 1 (2014): 15 – 20
EFFECTS
OF LITHIUM DOPANT ON SIZE AND MORPHOLOGY OF MAGNESIUM OXIDE NANOPOWDERS
(Kesan-Kesan
Litium Sebagai Pendopan Keatas Saiz dan Morfologi Serbuk Nano Magnesium Oksida)
Mohd Sufri
Mastuli1,2*, Siti Nur Hazlinda Hasbu1, Noraziahwati
Ibrahim1, Mohd Azizi Nawawi1
1School of Chemistry and Environmental
Studies, Faculty of Applied Sciences,
Universiti
Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
2Centre for Nanomaterials Research,
Institute
of Science, Level 3 Block C,
Universiti
Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
*Corresponding author: mohdsufri@salam.uitm.edu.my
Abstract
Lithium doped of magnesium
oxide powders have been synthesized using the sol-gel method with magnesium
acetate tetrahydrate, oxalic acid dihydrate and lithium acetate dihydrate used as
the starting materials. The dried sol-gel products were calcined at 950 °C for
36 h to form the Li doped-MgO samples. The calcined samples were characterized
using X-Ray diffraction (XRD) and field emission scanning electron microscopy
(FESEM). The present work is investigated the effect of lithium ion on the band
gap energy of studied samples. The band gap energies were obtained from a Tauc
plot that drawn based on absorption edge of each sample that measured using a
UV-Vis spectrophotometer. It is found that the doped and undoped MgO samples showed
a slightly different in their band gap energies. The lithium ion that present
in the MgO as a dopant affects the crystallite size and morphology of the final
products. Our study shows that the lithium dopant can modified optical properties
of the metal oxide which to be beneficial in some industrial applications.
Keyword: Magnesium
oxide, doping, sol-gel method, band gap energy
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