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Surface Energy Change of Atomic-Scale Metal Oxide Thin Films by Phase Transformation.
ACS Nano ( IF 17.1 ) Pub Date : 2020-01-16 , DOI: 10.1021/acsnano.9b07430
Il-Kwon Oh 1, 2 , Li Zeng 1 , Jae-Eun Kim 3, 4 , Jong-Seo Park 2, 5 , Kangsik Kim 6 , Hyunsoo Lee 3, 4 , Seunggi Seo 2 , Mohammad Rizwan Khan 5 , Sangmo Kim 7 , Chung Wung Park 7 , Junghoon Lee 8 , Bonggeun Shong 9 , Zonghoon Lee 6 , Stacey F Bent 1 , Hyungjun Kim 2 , Jeong Young Park 3, 4 , Han-Bo-Ram Lee 5
Affiliation  

Fine-tuning of the surface free energy (SFE) of a solid material facilitates its use in a wide range of applications requiring precise control of the ubiquitous presence of liquid on the surface. In this study, we found that the SFE of rare-earth oxide (REO) thin films deposited by atomic layer deposition (ALD) gradually decreased with increasing film thickness; however, these changes could not be understood by classical interaction models. Herein, the mechanism underlying the aforesaid decrease was systematically studied by measuring contact angles, surface potential, adhesion force, crystalline structures, chemical compositions, and morphologies of the REO films. A growth mode of the REO films was observed: layer-by-layer growth at the initial stage with an amorphous phase and subsequent crystalline island growth, accompanied by a change in the crystalline structure and orientation that affects the SFE. The portion of the surface crystalline facets terminated with (222) and (440) planes evolved with an increase in ALD cycles and film thickness, as an amorphous phase was transformed. Based on this information, we demonstrated an SFE-tuned liquid tweezer with selectivity to target liquid droplets. We believe that the results of this fundamental and practical study, with excellent selectivity to liquids, will have significant impacts on coating technology.

中文翻译:

通过相变改变原子尺度金属氧化物薄膜的表面能。

固体材料的表面自由能(SFE)的微调有助于其在需要精确控制表面上普遍存在的液体的广泛应用中使用。在这项研究中,我们发现通过原子层沉积(ALD)沉积的稀土氧化物(REO)薄膜的SFE随着膜厚度的增加而逐渐减小;但是,经典的交互模型无法理解这些变化。在此,通过测量REO膜的接触角,表面电势,粘附力,晶体结构,化学组成和形态来系统地研究了导致上述减少的机理。观察到REO膜的生长模式:在初始阶段以非晶相逐层生长,随后出现结晶岛生长,伴随着影响SFE的晶体结构和取向的变化。随着非晶态相的转变,以(222)和(440)面终止的表面结晶面的一部分随着ALD循环和膜厚度的增加而发展。基于此信息,我们展示了SFE调谐的液体镊子,对目标液滴具有选择性。我们相信,这项基础性和实用性研究的结果,对液体具有优异的选择性,将对涂料技术产生重大影响。我们展示了SFE调谐的液体镊子,对目标液滴具有选择性。我们相信,这项基础性和实用性研究的结果,对液体具有优异的选择性,将对涂料技术产生重大影响。我们展示了SFE调谐的液体镊子,对目标液滴具有选择性。我们相信,这项基础性和实用性研究的结果,对液体具有优异的选择性,将对涂料技术产生重大影响。
更新日期:2020-01-17
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