Morphological, microstructural, and photoluminescence characterization of heterogeneous/homogeneous TeO₂ nanostructures based on effect of different N₂ gas flow rates
- Authors
- Na, Han Gil; Jung, Taek-Kyun; Ryou, Min; Lee, Ji-Woon; Beck, Jihyun; Hyun, Soong-Keun; Choi, Myung Sik; Mirzaei, Ali; Choe, Kyeonghwan; Kim, Hyoun Woo; Jin, Changhyun
- Issue Date
- Feb-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- TeO2 nanowires; Flow rate; Thermal evaporation; Electron microscopy; Photoluminescence
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.695, pp.715 - 720
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 695
- Start Page
- 715
- End Page
- 720
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/21200
- DOI
- 10.1016/j.jallcom.2016.11.124
- ISSN
- 0925-8388
- Abstract
- TeO₂ nanowires with diameters ranging from a few tens to hundreds of nanometers and lengths of a few tens of micrometers were prepared by thermal evaporation of Te powder with a Co catalyst. Initially, bead-like gamma-TeO₂ nanoparticles on the surface of pre-formed thick TeO₂ nanowires were heterogeneously formed. Subsequently, uniform thin TeO₂ nanowires without the gamma-TeO₂ phase were homogeneously synthesized by changing only the inlet N₂ gas flow rates and keeping other process parameters constant. The morphological and microstructural evolution of the two different nanomaterials was examined by Xray diffraction, energy-dispersive X-ray spectrometry, and scanning and transmission electron micro-scopy. The optical properties of the nanomaterials were also investigated using photoluminescence spectroscopy. The emission peaks in the PL measurement without the supply of N-₂ gas showed a synergetic effect between (1) bead-like orthorhombic gamma-TeO₂ nanoparticles that show two specific emission bands at 388 nm and 590 nm; and (2) uniform tetragonal TeO₂ nanowires that show a characteristic emission band at 440 nm. In contrast, the pure tetragonal TeO₂ nanostructures synthesized under a N₂ gas flow rate of ₂ standard liters per minute flow rate revealed a red-shifted emission band at 450 nm compared to heterogeneous structures of the same composition. The origins of the growth and emission mechanisms in the different TeO₂ structures are also discussed.
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