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  • 글주소
  • 02-20
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Keywords: nanostructures, vapor deposition, luminescence, electron microscopy


Abstract
Two different TeO2- and ZnO-based nanocomposites were synthesized by a continuous two-step
gas phase transport process with a pre-deposited Au catalyst at different synthetic temperatures.
The morphology and composition of the TeO2 nanowires showed successive changes with ZnO
precursor powder with increasing temperature, going from TeO2 nanowires to TeO2/ZnO
nanocomposites. The photoluminescence (PL) spectra of these samples indicated that (1) the assynthesized
TeO2 nanowires have a broad blue emission band at 420 nm as well as green (540 nm),
orange (607 nm), and red (723 nm) emissions, and (2) the TeO2/ZnO nanocomposites display
not only a narrow violet emission band at 380 nm but also green (510 and 540 nm), orange (607
and 645 nm), and red (723 nm) bands. The optical quality of two different samples, based on the
emission intensity ratio (Iexcitonic/Idefect) related to band to band transitions and deep level defects, has
a tendency to decrease rapidly with increasing synthesis temperature. Simple control of the synthetic
temperature zone between two different oxide composites may cause functional, compositional, and
optical changes in the product.