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  • 02-20
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Keywords: nanostructured materials, oxides, crystal growth, crystal structure, ceramics

Abstract

Several TeO2 low-dimensional nanostructures were prepared by thermal evaporation using four substrate conditions:
(1) a bare substrate, (2) a scratched substrate, (3) a Au-catalyst-assisted substrate, and (4) a multi-walled carbon
nanotube (MWCNT)-assisted substrate. Scanning electron microscopy and transmission electron microscopy
analysis reveals that the morphologies of the nanostructures synthesized using these methods gradually changed
from nanoparticles to ultra-thin nanowires with single tetragonal-type TeO2. Photoluminescence (PL) spectra
reveal that the PL intensities of the TeO2 nanomaterials obtained using methods (1) and (2) are slightly increased,
whereas the intensities of the TeO2 nanostructures obtained using methods (3) and (4) differ significantly depending
on the initial substrate conditions. The emission peak is also blue-shifted from ~440 nm to ~430 nm for the
scratched surface condition due to an excitonic transition. The increase in the blue emission for the MWCNTassisted
condition is attributed to the degree and type of excitons and defects in the TeO2 nanostructures