Microcontact Printing of Organic Self-Assembled Monolayers for Patterned Growth of Well-Aligned ZnO Nanorod Arrays and their Field-Emission Properties
Microcontact Printing of Organic Self-Assembled Monolayers for Patterned Growth of Well-Aligned ZnO Nanorod Arrays and their Field-Emission Properties
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DOI：
10.1111/j.1551-2916.2009.03206.x
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发表时间：
2009-10
影响因子：
3.9
通讯作者：
Jian-Hong Lee;M. Hon;Y. Chung;I. Leu
中科院分区：
文献类型：
--
作者：
Jian-Hong Lee;M. Hon;Y. Chung;I. Leu
本文描述了一种简单的方法，用于制备排列良好的ZnO纳米棒阵列在一个更可调的方式，这使得纳米棒的合成直接在各种图案和阵列密度的容易控制。该方法是基于图案化的微接触印刷工艺和沉积ZnO纳米棒的溶液方法的组合。研究了接触区和非接触区的生长行为。提出了不同的形成机制，发现纳米棒和微米棒形式之间的关键区别是ZnO种子层和特定条件下的货车范德华力。讨论了十八烷基三氯硅烷自组装膜在反应液中的作用。通过测量水接触角来评估表面的润湿性，并且结果显示随着表面形态的显著变化，从17.6°到123.6°。在电流密度为10 μA/cm 2时，最低的开启场强为4.65 V/μm，这是由最低的纳米棒阵列密度实现的。纳米棒的场发射特性被发现是高度可重复的。研究结果对ZnO纳米棒阵列作为阴极材料的场发射器件的应用具有一定的参考价值。
This paper describes a simple method for preparing well-aligned ZnO nanorod arrays in a more tunable fashion, which enables the synthesis of nanorods directly in various patterns and the easy control of the array density. This method is based on a combination of the microcontact printing process for patterning and a solution approach for depositing ZnO nanorods. The growth behavior between the contact and noncontact areas is investigated. Different formation mechanisms are proposed, and it is found that the key difference between nanorod and microrod forms was the ZnO seed layer and the van der Waals force at specific conditions. The role of self-assembled monolayers of octadecyl-trichloro-silane in the reaction solution is also discussed. Wettability of the surfaces is assessed by measuring the water contact angle, and the results show significant variation with surface morphology, from 17.6° to 123.6°. The lowest turn-on applied field strength is 4.65 V/μm at the current density of 10 μA/cm2, which is achieved by the lowest array density of nanorods. The field-emission characteristics of the nanorods are found to be highly reproducible. The results could be valuable for the application of field-emission-based devices using ZnO nanorod arrays as cathode materials.