The Structure and Photoluminescence Properties of Bi₂O₃-Core/SnO₂-Shell Nanowires

Authors: Jin, Changhyun; Kim, Hyunsoo; Lee, Chongmu

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 1, January 2011 , pp. 624-628(5)

Publisher: American Scientific Publishers

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Abstract:

Bi₂O₃-core/SnO₂-shell nanowires have been prepared by using a two-step process: thermal evaporation of Bi₂O₃ powders and sputtering of SnO₂. The crystalline nature of the Bi₂O₃-core/SnO₂-shell nanowires has been revealed by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). TEM analysis and X-ray diffraction (XRD) results indicate that the Bi₂O₃-core/SnO₂-shell nanowires consist of pure tetragonal α-Bi₂O₃-phase momocrystalline cores and tetragonal SnO₂-phase polycrystalline shells. The photoluminescence (PL) measurements show that Bi₂O₃ nanowires have a broad emission band centered at around 560 nm in the yellow-green region. On the other hand, the Bi₂O₃-core/SnO₂-shell coaxial nanowires with the sputtering times of 4 and 8 min have a blue emission band centered at around 450 nm. In contrast, those with a sputtering time of 10 min have a broad emission band centered at ∼550 nm again. The origin of this yellow-green emission from the core/shell nanowires, however, quite differs from that from Bi₂O₃ nanowires, i.e., it is not from the Bi₂O₃ cores but from the SnO₂ shells.

Keywords: BI2O3-CORE/SNO2-SHELL NANOWIRES; AL2O3 SUBSTRATE; PHOTOLUMINESCENCE; TEM

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2011.3253

Publication date: 2011-01-01

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