X射线光电子能谱
薄膜
氩
分析化学(期刊)
溅射
化学
碘
材料科学
化学工程
纳米技术
有机化学
工程类
作者
Paul Dietrich,Marit Kjærvik,Elizabeth A. Willneff,Wolfgang E. S. Unger
出处
期刊:Biointerphases
[American Institute of Physics]
日期:2022-05-01
卷期号:17 (3): 031002-031002
被引量:3
摘要
Here, we present a study on agarose thin-film samples that represent a model system for the exopolysaccharide matrix of biofilms. Povidone-iodide (PVP-I) was selected as an antibacterial agent to evaluate our x-ray photoelectron spectroscopy (XPS)-based methodology to trace specific marker elements, here iodine, commonly found in organic matrices of antibiotics. The in-depth distribution of iodine was determined by XPS analyses with variable excitation energies and in combination with argon gas cluster ion beam sputter cycles. On mixed agarose/PVP-I nanometer-thin films, both methods were found to solve the analytical task and deliver independently comparable results. In the mixed agarose/PVP-I thin film, we found the outermost surface layer depleted in iodine, whereas the iodine is homogeneously distributed in the depth region between this outermost surface layer and the interface between the thin film and the substrate. Depletion of iodine from the uppermost surface in the thin-film samples is assumed to be caused by ultrahigh vacuum exposure resulting in a loss of molecular iodine (I2) as reported earlier for other iodine-doped polymers.
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