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首页> 外文期刊>IEEE transactions on nanotechnology >ZnO Nanotapered Arrays With Successively Modulated Sharpness Via a Supersaturation-Controlled Hydrothermal Reaction for Efficient Field Emitters
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ZnO Nanotapered Arrays With Successively Modulated Sharpness Via a Supersaturation-Controlled Hydrothermal Reaction for Efficient Field Emitters

机译：ZnO纳米锥阵列通过过饱和度控制的水热反应对有效场发射体进行连续调制的锐度

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摘要

ZnO nanotapered arrays (NTAs) with successively modulated sharpness have been successfully demonstrated by a novel supersaturation-controlled hydrothermal method in zinc-NH·HO system. The filament-like, needle-like, sword-like, and pagoda-like ZnO NTAs with cone angle ranging from ∼0°, 4.9 ± 1.5°, 20.4 ± 3.7° to 63.7 ± 2.5° can be obtained in an early supersaturated solution with different supersaturation level. The field emitter based on the sharper ZnO NTAs exhibits more excellent field emission (FE) performance. The sword-like emitter with cone angle of about 20° presents the most excellent FE performance with low turn-on electric field of 1.5 V·μm, low threshold voltage of 3.0 V·μm, a field enhancement factor of up to 9656 and stability for 60 min. The emitter with the smallest cone angle of about 4.9° shows abnormal performance degradation due to joule heating generated tip-melting phenomenon. Accordingly, the field emitter with proper sharpness is beneficial to FE devices for high efficiency. Our study provides an effective method and throws new light for performance optimization in flat panel displays and electronic devices.
机译：通过新颖的过饱和控制水热法在锌-NH·HO体系中成功地证明了具有连续调制锐度的ZnO纳米锥阵列（NTA）。可以在早期的过饱和溶液中获得锥角范围为〜0°，4.9±1.5°，20.4±3.7°至63.7±2.5°的细丝状，针状，剑状和宝塔状ZnO NTA。具有不同的过饱和水平。基于更尖锐的ZnO NTA的场发射器表现出更出色的场发射（FE）性能。锥角约为20°的剑状发射器具有最出色的有限元性能，具有1.5V·μm的低开启电场，3.0V·μm的低阈值电压，高达9656的场增强因子和稳定性持续60分钟最小锥角约为4.9°的发射器由于焦耳热产生的尖端熔化现象而显示出异常的性能下降。因此，具有适当锐度的场发射器对于FE装置具有高效率是有利的。我们的研究提供了一种有效的方法，并为优化平板显示器和电子设备的性能提供了新的思路。

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