Effects of post-heat-treatment temperature for seed layers on the properties of ZnO nanostructures grown by using the hydrothermal method

Title
Effects of post-heat-treatment temperature for seed layers on the properties of ZnO nanostructures grown by using the hydrothermal method
Author(s)
김종수김민수[김민수]김소아람[김소아람]조민영[조민영]임재영[임재영]김도엽[김도엽]김성오[김성오]남기웅[남기웅]이동율[이동율]김진수[김진수]
Keywords
THIN-FILMS; NANOWIRE ARRAYS; FIELD-EMISSION; PHOTOLUMINESCENCE; ULTRAVIOLET; DEPOSITION; PRESSURE; NANORODS; POWDERS
Issue Date
201205
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.60, no.10, pp.1593 - 1598
Abstract
Zinc oxide (ZnO) nanostructures were grown on sol-gel spin-coated ZnO seed layers by using the hydrothermal method. The seed layers were post-heated at various temperatures ranging from 350 to 500 A degrees C. The effects of the post-heat-treatment temperature for the seed layers on the structural and the optical properties of the ZnO nanostructures were investigated by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL). The seed layers postheated at temperatures above 450 A degrees C exhibited mountain-chain-like structures with voids while the surfaces of the ones post-heated at relatively lower temperatures showed a smooth morphology with high density. The full width at half maximum (FWHM) of the ZnO (002) diffraction peak of the seed layers decreased with increasing post-heat temperature, which indicates that the crystal quality of the seed layers was enhanced as the post-heat temperature was increased. The uniformity and the density of the ZnO nanostructures were affected by the uniformity and the morphology of the seed layers. In addition, the highest c-axis preferred orientation, the narrowest FWHM of the ZnO (002) diffraction peak, and the largest average grain size were shown in the ZnO nanostructures grown on the seed layers post-heated at a temperature of 400 A degrees C. Moreover, the intensity of the deep-level emission peak in the PL spectra increased with increasing post-heat temperature.
URI
http://hdl.handle.net/YU.REPOSITORY/28329http://dx.doi.org/10.3938/jkps.60.1593
ISSN
0374-4884
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이과대학 > 물리학과 > Articles
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