Abstract
We report synthesis of amorphous silicon oxide nano-spheres in bulk quantity by using a simple non-catalytic process based on thermal evaporation of silicon monoxide. Structural characteristics of the nano-spheres were investigated using high resolution scanning and transmission electron microscopes equipped with energy dispersive X-ray spectroscopy (EDAX). Selected area electron diffraction and EDAX analyses revealed that nano-spheres were amorphous and comprised of silicon oxide only with Si and O in an atomic ratio of ~ 1:2. Photoluminescence measurements showed that the SiO x nano-spheres had strong emission band in the blue region. Possible growth mechanism based on vapor-solid model has been discussed. The SiO vapors generated at high temperature react with O 2 to form SiO x vapors which subsequently condense on the substrates (placed in the appropriate temperature zone) to form SiO x nano-spheres.
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