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Annealing effects of ZnO seed layers on structural and optical properties of ZnO nanorods grown on R-plane sapphire substrates by hydrothermal Method

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Title
Annealing effects of ZnO seed layers on structural and optical properties of ZnO nanorods grown on R-plane sapphire substrates by hydrothermal Method
Author(s)
Min Su Kim; Giwoong N.; Kim D.; Kim E.H.; Kang H.; Lee W.B.; Choi H.; Kim Y.; Leem J.-Y.
Subject
hydrothermal synthesis, optical materials, nanostructured materials, annealing, optical properties,scanning electron microscopy
Publication Date
2015-02
Journal
KOREAN JOURNAL OF METALS AND MATERIALS, v.53, no.2, pp.139 - 144
Publisher
KOREAN INST METALS MATERIALS
Abstract
ZnO nanorods were hydrothermally grown on R-plane sapphire substrates coated with an as-grown ZnO seed layer and with ZnO seed layers annealed at different temperatures. The effects of the seed-layer annealing temperature on the structural and optical properties of the ZnO nanorods were investigated using scanning electron microscopy, X-ray diffraction, and photoluminescence. ZnO nanorods and nanosheets grew on the as-prepared seed layer. Only ZnO nanorods grew on the ZnO seed layer annealed above 700 °C. The structural and optical properties of the ZnO nanorods were significantly enhanced when the seed layers were annealed at 700 °C. A cubic equation was used to establish the non-linear exciton radiative lifetime of the free exciton emission peak. Varshni's empirical equation fitting parameters were α = 4 × 10-3 eV/K, β = 1 × 104 K, and Eg(0) = 3.335 eV; the activation energy was ∼94.6 meV. Copyright © The Korean Institute of Metals and Materials
URI
https://pr.ibs.re.kr/handle/8788114/2132
DOI
10.3365/KJMM.2015.53.2.139
ISSN
1738-8228
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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