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Synthesis and optical property of one-dimensional spinel ZnMn2O4 nanorods.

Zhang P, Li X, Zhao Q, Liu S - Nanoscale Res Lett (2011)

Bottom Line: The ZnMn2O4 nanorods in well-formed crystallinity and phase purity appeared with the width in 50-100 nm and the length in 1.5-2 μm.They exhibited strong absorption below 500 nm with the threshold edges around 700 nm.A significant photovoltage response in the region below 400 nm could be observed for the nanorods calcined at 650 and 800°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, China. xyli@dlut.edu.cn.

ABSTRACT
Spinel zinc manganese oxide (ZnMn2O4) nanorods were successfully prepared using the previously synthesized α-MnO2 nanorods by a hydrothermal method as template. The nanorods were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis absorption, X-ray photoelectron spectroscopy, surface photovoltage spectroscopy, and Fourier transform infrared spectroscopy. The ZnMn2O4 nanorods in well-formed crystallinity and phase purity appeared with the width in 50-100 nm and the length in 1.5-2 μm. They exhibited strong absorption below 500 nm with the threshold edges around 700 nm. A significant photovoltage response in the region below 400 nm could be observed for the nanorods calcined at 650 and 800°C.

No MeSH data available.


UV-Vis spectra and plots for band gaps determination. (a) The UV-Vis diffuse reflectance spectra of the ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively; (b) plots of (αhυ)2 versus photon energy of ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively.
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Figure 4: UV-Vis spectra and plots for band gaps determination. (a) The UV-Vis diffuse reflectance spectra of the ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively; (b) plots of (αhυ)2 versus photon energy of ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively.

Mentions: The optical property of the ZnMn2O4 nanorods can be observed by the UV-Vis diffuse reflectance spectroscopy. Figure 4a shows the UV-Vis diffuse reflectance spectra of the ZnMn2O4 nanorods calcined at different temperatures. All the samples have strong absorption between 300 and 500 nm, and the absorption edges of these samples are all around 700 nm. The optical band gaps could be determined from the curves of (αhυ)n versus hυ, α being the optical absorption coefficient. The exponent n equals 1/2 for indirectly allowed and 2 for directly allowed transitions (Figure 4). Figure 4b is the (αhυ)2-hν curves for the ZnMn2O4 nanorods calcined at different temperatures. The optical band gaps are calculated as 1.2, 1.34, and 1.45 eV for the samples calcined at 500, 650 and 800°C, respectively. No linear relation was found for n = 1/2, suggesting that the prepared ZnMn2O4 may be a semiconductor allowing direct transitions at these energy levels [3].


Synthesis and optical property of one-dimensional spinel ZnMn2O4 nanorods.

Zhang P, Li X, Zhao Q, Liu S - Nanoscale Res Lett (2011)

UV-Vis spectra and plots for band gaps determination. (a) The UV-Vis diffuse reflectance spectra of the ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively; (b) plots of (αhυ)2 versus photon energy of ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211411&req=5

Figure 4: UV-Vis spectra and plots for band gaps determination. (a) The UV-Vis diffuse reflectance spectra of the ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively; (b) plots of (αhυ)2 versus photon energy of ZnMn2O4 nanorods calcined at 500, 650, and 800°C, respectively.
Mentions: The optical property of the ZnMn2O4 nanorods can be observed by the UV-Vis diffuse reflectance spectroscopy. Figure 4a shows the UV-Vis diffuse reflectance spectra of the ZnMn2O4 nanorods calcined at different temperatures. All the samples have strong absorption between 300 and 500 nm, and the absorption edges of these samples are all around 700 nm. The optical band gaps could be determined from the curves of (αhυ)n versus hυ, α being the optical absorption coefficient. The exponent n equals 1/2 for indirectly allowed and 2 for directly allowed transitions (Figure 4). Figure 4b is the (αhυ)2-hν curves for the ZnMn2O4 nanorods calcined at different temperatures. The optical band gaps are calculated as 1.2, 1.34, and 1.45 eV for the samples calcined at 500, 650 and 800°C, respectively. No linear relation was found for n = 1/2, suggesting that the prepared ZnMn2O4 may be a semiconductor allowing direct transitions at these energy levels [3].

Bottom Line: The ZnMn2O4 nanorods in well-formed crystallinity and phase purity appeared with the width in 50-100 nm and the length in 1.5-2 μm.They exhibited strong absorption below 500 nm with the threshold edges around 700 nm.A significant photovoltage response in the region below 400 nm could be observed for the nanorods calcined at 650 and 800°C.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemical, School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, China. xyli@dlut.edu.cn.

ABSTRACT
Spinel zinc manganese oxide (ZnMn2O4) nanorods were successfully prepared using the previously synthesized α-MnO2 nanorods by a hydrothermal method as template. The nanorods were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis absorption, X-ray photoelectron spectroscopy, surface photovoltage spectroscopy, and Fourier transform infrared spectroscopy. The ZnMn2O4 nanorods in well-formed crystallinity and phase purity appeared with the width in 50-100 nm and the length in 1.5-2 μm. They exhibited strong absorption below 500 nm with the threshold edges around 700 nm. A significant photovoltage response in the region below 400 nm could be observed for the nanorods calcined at 650 and 800°C.

No MeSH data available.