The production of suitable coatings with excellent antibacterial performance has now become a viable technique for enhancing the functional qualities of various biomedical materials. Here, pulsed plasma polymerisation was used to produce an antibacterial coating from the carvone oil of the spearmint plant. The coating films have adjustable chemical and physical properties based on the deposition parameter – that is, duty cycle (DC). The static water contact angle (WCA) values of pulsed wave (PW) plasma-polymerised carvone (ppCar) increase with the increase in DC. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy showed that the molecular structure of carvone is less fragmented, retaining moieties associated with C–O and C=O when the DC is reduced. These C–O and C=O moieties likely reduced the measured static WCA. This surface chemical composition with predominantly C–O and C=O also showed a stronger bactericidal effect, based on the biofilm assay with bacteria (Escherichia coli and Staphylococcus aureus), compared with those coatings with C–C and C–H produced at a higher DC. As shown by the atomic force microscopy images, a lower DC resulted in smoother and more homogeneous coatings than those produced with a higher DC, while field emission scanning electron microscopy images show that when E. coli and S. aureus membranes were attached to PW ppCar, they ruptured and distorted with a pore created and that these distortions and ruptures increased as the DC was reduced.

中文翻译：

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香芹酮的脉冲等离子体聚合：表征和抗菌特性

生产具有优异抗菌性能的合适涂层现已成为增强各种生物医学材料功能品质的可行技术。在这里，脉冲等离子体聚合被用来从留兰香植物的香芹酮油中生产抗菌涂层。涂膜具有可根据沉积参数（即占空比 (DC)）调节的化学和物理特性。脉冲波(PW)等离子体聚合香芹酮(ppCar)的静态水接触角(WCA)值随着DC的增加而增加。傅里叶变换红外光谱和X射线光电子能谱表明，当DC降低时，香芹酮的分子结构碎片较少，保留了与C-O和C=O相关的部分。这些 C-O 和 C=O 部分可能会降低测量的静态 WCA。大肠杆菌和金黄色葡萄球菌），与在较高 DC 下产生的 C-C 和 C-H 涂层相比。如原子力显微镜图像所示，较低的 DC 比使用较高 DC 产生的涂层更光滑、更均匀，而场发射扫描电子显微镜图像显示，当大肠杆菌和金黄色葡萄球菌膜附着到 PW ppCar上时， ，它们破裂并扭曲，并产生孔隙，并且这些扭曲和破裂随着 DC 的减小而增加。