场电子发射
纳米线
材料科学
比例(比率)
领域(数学)
纳米技术
作者
L.A. Ma,Zhixiao Lin,J.Y. Lin,Y.A. Zhang,L.Q. Hu,Tailiang Guo
标识
DOI:10.1016/j.physe.2009.04.028
摘要
Abstract One-step thermal evaporation route was developed to produce large quantities of ultrathin magnesium oxide (MgO) nanowires on a steel mesh substrate. The synthesis of MgO nanowires was carried out in a tube furnace under air pressure using initial N2 gas at 900 °C and subsequent N2/O2 atmosphere reaction. Scanning electron microscopy and X-ray diffraction show that the products are very pure of crystalline MgO nanowires with diameter from 10 to 50 nm and lengths range from several hundred nm to more than 10 μm. High-resolution transmission electron microscopy and its corresponding electron pattern reveal that these MgO nanowires are single crystals with preferred growth direction along 〈1 0 0〉. Field emission (FE) properties on MgO nanowires show that its emission currents density can reach 2.1 mA/cm2 at electric field of 6.46 V/μm and have a very low turn-on field emission (1.3 V/μm). These results suggest that ultrathin MgO nanowire can be an excellent FE material candidate.
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