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Effect of the temperature on structural and optical properties of zinc oxide nanoparticles.
- Source :
-
Journal of nanoscience and nanotechnology [J Nanosci Nanotechnol] 2014 Jul; Vol. 14 (7), pp. 5443-8. - Publication Year :
- 2014
-
Abstract
- Zinc nitrate hexahydrate, Zn(NO3)2 x 6H2O was used as a precursor with urea NH2CONH2 to prepare hydrozincite Zn5(CO3)2(OH)6 powder using hydrothermal method for 8 h at 90 degrees C. Zinc oxide (ZnO) nanoparticles (NPs) were prepared by thermal annealing of hydrozincite powder at different annealing temperatures, i.e., 350, 550 750 and 950 degrees C in air for 2 h. The resulting materials were characterized by X-ray diffraction, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The optical properties of the products were characterized by Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy and photoluminescence (PL) spectra. It was found that the particle size increased from - 33 to 250 nm with increasing in the annealing temperatures. FTIR results showed that the standard peaks of zinc oxide were presented at 428.17 and 532.32 cm(-1). Thermal analysis study showed that the primary weight loss starts at - 93 degrees C is due to solvent evaporation. The secondary weight loss, observed at - 378 degrees C, is due to phase transition from hydrated zinc oxide to zinc oxide. The band gaps of the products were in the range - 3.26-3.30 eV. The PL spectrum showed that the as-synthesized ZnO nanoparticles had UV (381 nm) and green (537 nm) emissions.
Details
- Language :
- English
- ISSN :
- 1533-4880
- Volume :
- 14
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Journal of nanoscience and nanotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 24758046
- Full Text :
- https://doi.org/10.1166/jnn.2014.8861