Yang, Haopeng and Zhang, Dengsong and Shi, Liyi and Fang, Jianhui (2008) Synthesis and strong red photoluminescence of europium oxide nanotubes and nanowires using carbon nanotubes as templates. ACTA MATERIALIA, 56 (5). pp. 955-967.
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Official URL: http://dx.doi.org/10.1016/j.actamat.2007.10.052
Europium oxide nanotubes and nanowires have been successfully synthesized by a facile solvothermal method using carbon nanotubes (CNTs) as removable templates. The products were characterized by X-ray diffraction spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectrometry, Fourier-transform infrared spectrophotometry, thermogravimetric and differential thermal analysis, and X-ray photoelectron spectroscopy. It is demonstrated that CNTs are fully coated with an amorphous Eu(OH)(3) layer, which is similar to 12 nm thick and almost continuous and uniform. After the Eu(OH)(3)/CNTs composites have been calcined at various temperatures, europium oxide nanotubes and nanowires are obtained by removing the CNT templates. The inner diameter of the europium oxide nanotubes is 40-60 nm, which is consistent with that of CNTs. Both nanotubes and nanowires have a narrow distribution of diameters. Furthermore, the photo luminescence properties of the europium oxide nanotubes and nanowires calcined at various temperatures have been systematically investigated. The results indicate that when the Eu(OH)(3)/CNTs composites were calcined at 600 degrees C for 6 It, the europium oxide nanotubes obtained have a strong red emission peak of Eu (3+) ions at around 611 nm, due to the D-5(0)-> F-7(2) forced electric dipole transition of Eu (3+) ions. It is very interesting to discover that a few residual carbons doped in europium oxide nanotubes and many oxygen vacancies could promote the intensity of red emission peak of Eu (3+) ions. In addition, europium oxide nanowires calcined at 1050 degrees C for 6 It also have a strong red emission peak due to many vacancies, such as oxygen vacancies, and defects formed on the surface of the nanowires and inside them. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
|Uncontrolled Keywords:||coating; carbon nanotube; europium oxide; photoluminescence|
|Subjects:||Material Science > Nanofabrication processes and tools|
Material Science > Nanostructured materials
|Deposited By:||Lesley Tobin|
|Deposited On:||21 Nov 2008 16:11|
|Last Modified:||03 Feb 2009 11:37|
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