TiO2/SiOx core-shell nanowires generated by heating the multilayered substrates
- Authors
- Na, Han Gil; Kwak, Dong Sub; Kwon, Yong Jung; Cho, Hong Yeon; Lee, Chongmu; Kim, Hyoun Woo
- Issue Date
- Jul-2013
- Publisher
- KOREAN INST METALS MATERIALS
- Keywords
- semiconductors; optical properties; transmission electron microscopy; scanning electron microscopy; nanostructured materials
- Citation
- Metals and Materials International, v.19, no.4, pp.861 - 867
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- Metals and Materials International
- Volume
- 19
- Number
- 4
- Start Page
- 861
- End Page
- 867
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/162416
- DOI
- 10.1007/s12540-013-4030-6
- ISSN
- 1598-9623
- Abstract
- By heating Au/TiN/Si substrates, we fabricated TiO2/SiOx core-shell nanowires. By changing the thickness of predeposited Au layers, we demonstrated that the thickness of the Au layer needs to be optimized to obtain nanowires. High-resolution transmission electron microscopy image, X-ray diffraction spectrum, and selected area electron diffraction pattern coincidentally revealed that the resultant core nanowires had a tetragonal rutile structure of TiO2, and the shell was comprised of amorphous SiOx. The dominant growth mechanism was a base-growth mode, in which Au played a catalytic role, resulting in morphological changes with variation of the Au layer thickness. The TiO2/SiOx core-shell nanowires exhibited a broad photoluminescence emission band, which comprised four peaks centered at 1.54, 2.34, 2.67, and 2.99 eV, respectively. We expected that the 1.54 eV- and 2.34 eV-centered peaks arised from the TiO2 core, whereas the 2.67 eV- and 2.34 eV-peaks were ascribed to both the TiO2 core and the SiOx shell.
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