Superhydrophobic nanostructured Kapton® surfaces fabricated through Ar + O2 plasma treatment: Effects of different environments on wetting behaviour
Superhydrophobic nanostructured Kapton® surfaces fabricated through Ar + O2 plasma treatment: Effects of different environments on wetting behaviour
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DOI：
10.1016/j.apsusc.2012.12.130
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发表时间：
2013-03-01
影响因子：
6.7
通讯作者：
Anandan, C.
中科院分区：
文献类型：
--
作者：
Barshilia, Harish C.;Ananth, A.;Anandan, C.
Kapton (R)[聚（4,4'-氧基二苯二酰亚胺）]聚酰亚胺由于其优异的化学和物理性能，在半导体器件、太阳能电池阵列、保护涂层和空间应用中有着广泛的应用。除了它们固有的特性外，赋予这些表面超疏水性将是一个额外的优势。目前的工作描述了使用Ar + O-2等离子体处理制备超疏水卡普顿(R)表面。等离子体处理后，由于高能量悬空键和极性基团浓度，表面表现出超亲水性。低真空保存48 h的样品表现出超疏水性，具有较高的水接触角（> ~ 150°）。研究发现，等离子体后处理过程，称为老化，特别是在低真空下，在向Kapton (R)提供超疏水性方面起着重要作用。利用场发射扫描电镜和原子力显微镜观察了Kapton (R)表面的物理变化。表面呈现纳米羽状和纳米簇状微观结构，表面粗糙度随等离子体处理时间的变化而变化。利用傅里叶变换红外光谱和微拉曼光谱进行了彻底的化学研究，揭示了Ar + O-2等离子体处理后Kapton (R)表面的变化。未处理样品表面的x射线光电子能谱再次证实了Kapton (R)的表面化学种类，而Ar + O-2等离子体处理样品显示出结构元素的脱键和重组。除了Ar + O-2等离子体处理和低真空老化引起的表面修饰外，表面粗糙度的产生在超疏水性对Kapton (R)的贡献中起主导作用。(C) 2013 Elsevier B.V.版权所有
Kapton (R) [poly (4,4'-oxy diphenylene pyromellitimide)] polyimides have widespread usage in semiconductor devices, solar arrays, protective coatings and space applications, due to their excellent chemical and physical properties. In addition to their inherent properties, imparting superhydrophobicity on these surfaces will be an added advantage. Present work describes the usage of Ar + O-2 plasma treatment for the preparation of superhydrophobic Kapton (R) surfaces. Immediately after the plasma treatment, the surfaces showed superhydrophilicity as a result of high energy dangling bonds and polar group concentration. But the samples kept in low vacuum for 48 h exhibited superhydrophobicity with high water contact angles (>150 degrees). It is found that the post plasma treatment process, called ageing, especially in low vacuum plays an important role in delivering superhydrophobic property to Kapton (R). Field emission scanning electron microscopy and atomic force microscopy were used to probe the physical changes in the surface of the Kapton (R). The surfaces showed formation of nano-feathers and nano-tussock microstructures with variation in surface roughness against plasma treatment time. A thorough chemical investigation was performed using Fourier transform infrared spectroscopy and micro-Raman spectroscopy, which revealed changes in the surface of the Ar + O-2 plasma treated Kapton (R). Surface chemical species of Kapton (R) were confirmed again by X-ray photoelectron spectroscopy spectra for untreated surfaces whereas Ar + O-2 plasma treated samples showed the de-bonding and re-organization of structural elements. Creation of surface roughness plays a dominant role in the contribution of superhydrophobicity to Kapton (R) apart from the surface modifications due to Ar + O-2 plasma treatment and ageing in low vacuum. (C) 2013 Elsevier B.V. All rights reserved.