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首页> 外文期刊>Nanotechnology >Morphology-dependent low macroscopic field emission properties of titania/titanate nanorods synthesized by alkali-controlled hydrothermal treatment of a metallic Ti surface
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Morphology-dependent low macroscopic field emission properties of titania/titanate nanorods synthesized by alkali-controlled hydrothermal treatment of a metallic Ti surface

机译：碱控制水热处理金属钛表面合成的二氧化钛/钛酸盐纳米棒的形貌依赖性低宏观场发射特性

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摘要

One-dimensional (1D) and two-dimensional (2D) titania/titanate nanostructures are fabricated directly on a self-source metallic titanium (Ti) surface via in situ surface re-construction of a Ti substrate using potassium hydroxide (KOH) under a hydrothermal (HT) condition. The effect of temperature and the concentration of KOH on the variations in morphology and titania-totitanate phase changes are studied and explained in detail. A growth model is proposed for the formation process of the platelet-to-nanorod conversion mechanism. The field emission (FE) properties of titania/titanate nanostructures are studied, and the effects of the morphologies (such as 1D nanorods, 2D nanoplatelets, and a mixture of 1D nanorods and 2D platelets) on the FE properties of the samples are investigated. The samples depict a reasonable low turn-on field and emission stability. The FE mechanism is observed to follow standard Fowler-Nordheim (FN) electron tunneling. The geometrical field enhancement factor (beta) is measured to be very high, and is compared with theoretical values calculated from various existing models to explore the feasibility of these models. The surface modification of metallic Ti by a simple non-lithographic bottom-up method and the low-macroscopic FE properties can provide a potential alternative to field emission displays for low-power panel technology.
机译：在一氧化钛/钛酸盐纳米结构的一维（1D）和二维（2D）纳米结构是直接在自生金属钛（Ti）表面上通过使用氢氧化钾（KOH）在Ti衬底下原位表面重建而在Ti衬底上制造的。热液（HT）条件。研究并详细解释了温度和KOH浓度对形态变化和二氧化钛-钛酸酯相变的影响。针对血小板向纳诺德转化机制的形成过程，提出了一种生长模型。研究了二氧化钛/钛酸盐纳米结构的场发射（FE）特性，并研究了形貌（例如1D纳米棒，2D纳米片以及1D纳米棒和2D血小板的混合物）对样品FE特性的影响。样品描述了合理的低导通场和发射稳定性。观察到FE机制遵循标准的Fowler-Nordheim（FN）电子隧穿。测得的几何场增强因子（beta）非常高，并将其与从各种现有模型计算出的理论值进行比较，以探索这些模型的可行性。通过简单的非光刻自底向上方法对金属Ti进行的表面改性和低宏观的FE特性可以为低功率面板技术提供场发射显示器的潜在替代品。

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