MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향 = Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires

다국어 초록 (Multilingual Abstract)

MgO nanowires were grown by a thermal evaporation method at different N2/O2 gas ratios in orderto investigate the effect of oxygen concentration on the growth and luminescence properties of the MgOnanowires. A thermal evaporation process was conducted at 1000oC and under a pressure of 500Torr. Nonanowires were grown in a pure N2 gas atmosphere. Nanowires were formed at oxygen concentrations above25% in a mixture of N2 and O2 gases. X-ray diffraction analysis showed that the MgO nanowires had a cubiccrystal structure. Compared to the nanowires formed at high oxygen concentration, the nanowires grown at lowoxygen concentration had larger diameters and rougher side surfaces. Nanowires with very smooth side surfaceswere formed at high oxygen concentrations. The difference in surface roughness was supposed to be due to thechange in the growth habit of nuclei. Two visible emissions were observed in the cathodoluminescence spectraof the MgO nanowires. One was an emission peak centered near 400 nm and the other was an emission peakwith a central wavelength of 500 nm. As the oxygen concentration increased, the emission intensity of the 400nm band decreased and the emission intensity of the 500 nm band increased. The maximum emission at 500nm was observed from the nanowires formed in a pure O2 atmosphere. The full width at half maximum of theemission peak at 500 nm was narrower than that of the emission peak at 400 nm.

참고문헌 (Reference)

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