Jarvis Karyn, McArthur Sally
ANFF-Vic Biointerface Engineering Hub, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
Biomedical Manufacturing, CSIRO Manufacturing, Clayton, VIC 3153, Australia.
Materials (Basel). 2019 Aug 15;12(16):2597. doi: 10.3390/ma12162597.
A number of different reactor geometries can be used to deposit plasma polymer films containing specific functional groups and result in films with differing properties. Plasma polymerization was carried out in a low-pressure custom-built stainless steel T-shaped reactor using a radio frequency generator. The internal aluminium disk electrode was positioned in two different geometries: parallel and perpendicular to the samples at varying distances to demonstrate the effect of varying the electrode position and distance from the electrode on the properties of plasma polymerized acrylic acid (ppAAc) films. The surface chemistry and film thickness before and after aqueous immersion were analysed via X-ray photoelectron spectroscopy and spectroscopic ellipsometry, respectively. For a perpendicular electrode, the ppAAc film thicknesses and aqueous stability decreased while the COOH/R group concentrations increased as the distance from the electrode increased due to decreased fragmentation. For films deposited at similar distances from the electrode, those deposited with the parallel electrode were thicker, had lower COOH/R group concentrations and greater aqueous stability. These results demonstrate the necessity of having a well characterized plasma reactor to enable the deposition of films with specific properties and how reactor geometry can be exploited to tailor film properties.
可以使用多种不同的反应器几何结构来沉积含有特定官能团的等离子体聚合物薄膜，并得到具有不同性质的薄膜。等离子体聚合是在一个定制的低压不锈钢T形反应器中使用射频发生器进行的。内部铝盘电极有两种不同的几何定位方式：与样品平行以及垂直，且距离不同，以展示改变电极位置和电极与样品的距离对等离子体聚合丙烯酸（ppAAc）薄膜性质的影响。分别通过X射线光电子能谱和椭偏光谱分析了水浸前后的表面化学性质和薄膜厚度。对于垂直电极，随着电极距离增加，由于碎片化减少，ppAAc薄膜厚度和水稳定性降低，而COOH/R基团浓度增加。对于在距电极相似距离处沉积的薄膜，平行电极沉积的薄膜更厚，COOH/R基团浓度更低，水稳定性更高。这些结果证明了拥有一个特征明确的等离子体反应器对于沉积具有特定性质薄膜的必要性，以及如何利用反应器几何结构来调整薄膜性质。
