Abstract
Tubular micrometer-sized ZnS:Mn 2+ constructed by fluffy nanostructures were fabricated in the mixed solutions of water and ethanol in a fixed volume ratio with the aid of ethylenediamine. In the X-ray diffraction pattern, the products obtained in the presence and absence of ethylenediamine show the wurtzite and sphalerite phases, respectively. Field-emission scanning electron microscopic images reveal the evolution process from nanowires to fluffy ZnS:Mn 2+ to microtubes with the reaction times of 2, 4, and 8 hours at 100°C, and the basal nanowires are below 10 nm in diameter. Photoluminescence and photoluminescence excitation spectra were investigated. The results suggest that the wurtzite phase, instead of the sphalerite phase ZnS:Mn 2+ is luminescence-active for the 4T 1- 6A 1 transition of the Mn 2+ in the ZnS host. The excitation spectra monitored at orange emission bands exhibit sharp peaks at 320, 326 and 327 nm with increasing reaction times of 2, 4, and 8 hours, respectively, indicating the energy transfer from ZnS host to Mn 2+ ions, and the blue-shifts compared with the band gap absorption of the bulk counterpart (344 nm) are also observed due to the quantum confinement effects. The formation mechanism of the wurtzite one-dimensional nanostructures at such a low temperature is proposed based on a molecular template mechanism involving the bidentate coordinating ligand, ethylenediamine, and the possible formation mechanism of novel tubular structure are also discussed.
Original language | English |
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Pages (from-to) | 1326-1329 |
Number of pages | 4 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 8 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2008 |
Scopus Subject Areas
- Bioengineering
- General Chemistry
- Biomedical Engineering
- General Materials Science
- Condensed Matter Physics
Keywords
- Energy transfer
- Hydrothermal synthesis
- Microtubes
- Photoluminescence
- Semiconductor
- ZnS:Mn nanowires