氧浓度对MgO纳米线生长和阴极发光性能的影响

IF 1.1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Korean Journal of Metals and Materials Pub Date : 2023-07-05 DOI:10.3365/kjmm.2023.61.7.509
Geun-Hyoung Lee
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引用次数: 0

摘要

为了研究氧浓度对MgO纳米线生长和发光性能的影响,采用热蒸发法在不同的N2/O2气体比下生长了MgO纳米线。热蒸发过程在1000℃和500托的压力下进行。在纯N2气体气氛中没有生长纳米线。在N2和O2气体的混合物中,在高于25%的氧浓度下形成纳米线。X射线衍射分析表明,MgO纳米线具有立方晶体结构。与在高氧浓度下形成的纳米线相比,在低氧浓度下生长的纳米线具有更大的直径和更粗糙的侧表面。在高氧浓度下形成了具有非常光滑侧表面的纳米线。表面粗糙度的差异被认为是由于细胞核生长习惯的改变。在MgO纳米线的阴极发光光谱中观察到两个可见光发射。一个是以400nm为中心的发射峰,另一个是具有500nm的中心波长的发射峰。随着氧浓度的增加,400nm波段的发射强度降低,500nm波段的辐射强度增加。从在纯O2气氛中形成的纳米线观察到在500nm处的最大发射。在500nm处的发射峰的半峰处的全宽比在400nm处的发光峰的全宽窄。
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Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires
MgO nanowires were grown by a thermal evaporation method at different N2/O2 gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000oC and under a pressure of 500Torr. No nanowires were grown in a pure N2 gas atmosphere. Nanowires were formed at oxygen concentrations above 25% in a mixture of N2 and O2 gases. X-ray diffraction analysis showed that the MgO nanowires had a cubic crystal structure. Compared to the nanowires formed at high oxygen concentration, the nanowires grown at low oxygen concentration had larger diameters and rougher side surfaces. Nanowires with very smooth side surfaces were formed at high oxygen concentrations. The difference in surface roughness was supposed to be due to the change in the growth habit of nuclei. Two visible emissions were observed in the cathodoluminescence spectra of the MgO nanowires. One was an emission peak centered near 400 nm and the other was an emission peak with a central wavelength of 500 nm. As the oxygen concentration increased, the emission intensity of the 400 nm band decreased and the emission intensity of the 500 nm band increased. The maximum emission at 500 nm was observed from the nanowires formed in a pure O2 atmosphere. The full width at half maximum of the emission peak at 500 nm was narrower than that of the emission peak at 400 nm.
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来源期刊
Korean Journal of Metals and Materials
Korean Journal of Metals and Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING
CiteScore
1.80
自引率
58.30%
发文量
100
审稿时长
4-8 weeks
期刊介绍: The Korean Journal of Metals and Materials is a representative Korean-language journal of the Korean Institute of Metals and Materials (KIM); it publishes domestic and foreign academic papers related to metals and materials, in abroad range of fields from metals and materials to nano-materials, biomaterials, functional materials, energy materials, and new materials, and its official ISO designation is Korean J. Met. Mater.
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