Self-Assembly and Tribological Property of a Novel 3-Layer Organic Film on Silicon Wafer with Polydopamine Coating as the Interlayer
Self-Assembly and Tribological Property of a Novel 3-Layer Organic Film on Silicon Wafer with Polydopamine Coating as the Interlayer
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DOI：
10.1021/jp9073416
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发表时间：
2009-11-26
影响因子：
3.7
通讯作者：
Yang, Shengrong
中科院分区：
文献类型：
--
作者：
Ou, Junfei;Wang, Jinqing;Yang, Shengrong
以聚多巴胺涂层(简称PDAC)为过渡层，采用多步自组装工艺在硅片上制备了一种新型的三层有机薄膜，通过椭偏厚度测量、水接触角测量和衰减全反射傅里叶变换红外光谱(ATR-FTIR)对薄膜的形成和结构进行了分析。同时，用原子力显微镜(AFM)表征了三层膜的粘着性能和微观摩擦学性能，并用球板式摩擦试验机测试了宏观摩擦学性能。结果表明，所制备的三层膜具有良好的摩擦学性能，表现为较低的摩擦学性能和较高的抗磨性能，这归因于膜的特殊化学结构，即膜与硅片的粘附性强，相邻层之间的化学键，PDAC中间层的交联结构，以及硬脂酰氯(STC)外层的疏水性、高柔韧性和高弹性。希望本工作为构建具有良好结构稳定性和摩擦学性能的多层膜提供了一条可行的途径。这种多层膜可能会在边界润滑和许多其他领域找到潜在的应用。
A novel 3-layer organic film was fabricated on silicon wafer with a polydopamine coating (coded as PDAc) as the interlayer by a multistep self-assembly process, The formation and structure of the films were analyzed by means of ellipsometric thickness measurement, water contact angle measurement, and attenuated total reflection-Fourier transform infrared spectrometry (ATR-FTIR). Meanwhile, an atomic force microscope (AFM) characterization was performed to evaluate the adhesive and microtribological behaviors of the 3-layer film, and a ball-on-plate tribometer was used to test macrotribological performance. As results show, the as-prepared 3-layer film possessed the excellent tribological properties characterized by lower friction and higher antiwear ability, which was ascribed to the special chemical structure of the film, i.e., the strong adhesion of the film to the silicon wafer, the chemical bonding between the adjacent layers, the cross-linked structure of the PDAc interlayer, and the hydrophobicity, high flexibility, and high elasticity of the stearoyl chloride (STC) outer layer. Hopefully, the present work provides a feasible route to construct a multilayer film with excellent structural stability and tribological behavior. The titled multilayer film might find potential applications in boundary lubrication and many other areas.