School of Engineering, University of South Australia, Mawson Lakes 5095, Australia.
Future Industries Institute, University of South Australia, Mawson Lakes 5095, Australia.
Biointerphases. 2020 Jun 26;15(3):031015. doi: 10.1116/6.0000259.
The stable nitroxide radical TEMPO [(2,2,6,6-Tetramethylpiperidin-1-yl)oxyl] has a multitude of applications in fields ranging from energy storage to biomedical applications and many more. However, to date, the processes of incorporating nitroxide radicals into thin-film coatings are laborious and not cost-effective, which hinders their wider use in many applications. In contrast, the authors have recently demonstrated the facile method of plasma polymerization of TEMPO into thin-film coatings that retain the stable nitroxide radicals. In this work, we are using three types of mass spectroscopic methods (plasma-mass spectrometry, time of flight secondary ion mass spectrometry, and high-performance liquid chromatography-mass spectrometry) and electron spin resonance to track the fate of the TEMPO molecule from monomer flask through the plasma and inside the resulting coatings. The results of this study demonstrate that TEMPO is a versatile monomer that can be used across different plasma reactors and reliably retain the stable nitroxide radical in the resulting thin-film coatings if certain process conditions are observed, namely, higher process pressures and lower powers.
稳定的氮氧自由基 TEMPO [(2,2,6,6-四甲基哌啶-1-基)氧自由基] 在储能到生物医学应用等众多领域都有广泛的应用。然而，迄今为止，将氮氧自由基掺入薄膜涂层的过程繁琐且不具成本效益，这限制了它们在许多应用中的广泛使用。相比之下，作者最近展示了一种简便的 TEMPO 等离子体聚合方法，可将稳定的氮氧自由基掺入薄膜涂层中。在这项工作中，我们使用了三种质谱方法（等离子体质谱、飞行时间二次离子质谱和高效液相色谱-质谱）和电子自旋共振来跟踪 TEMPO 分子从单体瓶到等离子体再到所得涂层中的命运。这项研究的结果表明，TEMPO 是一种多功能单体，可用于不同的等离子体反应器，如果观察到某些工艺条件，即更高的工艺压力和更低的功率，它可以可靠地在所得薄膜涂层中保留稳定的氮氧自由基。
