Raman spectroscopic and photoluminescence study of single-crystalline SnO2 nanowires |
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Authors: | J.X. Zhou J.M. Hong Z. Yin |
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Affiliation: | National Laboratory of Solid State Microstructures and Center for Materials Analysis, Nanjing University, Nanjing 210 093, Jiangsu, People's Republic of China |
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Abstract: | Single-crystalline SnO2 nanowires with sizes of 4-14 nm in diameter and 100-500 nm in length were produced in a molten salt approach by using hydrothermal synthesized precursor. Structural characters of the nanowires were examined by X-ray diffraction and high-resolution electron transmission microscopy. Raman, photoluminescence and X-ray photoelectron spectra of the samples were examined under heat treatments. Three new Raman modes at 691, 514 and 358 cm−1 were recorded and assigned. The former two are attributed to activation of original Raman-forbidden A2uLO mode and the third is attributed to defects in small-sized nanowires. A strong photoluminescence is observed at about 600 nm, the temperature effects is examined and the origin of the PL process is discussed via X-ray photoelectron spectra. |
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Keywords: | 78.67.&minus n 81.07.&minus b 78.30.Hv |
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