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Hydrophobic metallic nanorods with Teflon nanopatches

机译：聚四氟乙烯纳米补丁的疏水金属纳米棒

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Introducing a hydrophobic property to vertically aligned hydrophilic metallic nanorods was investigated experimentally and theoretically. The platinum nanorod arrays were deposited on flat silicon substrates using a sputter glancing angle deposition technique (GLAD). Then a thin layer of Teflon (nanopatch) was partially deposited on the tips of platinum nanorods at a glancing angle of theta(dep) = 85 degrees for different deposition times. Teflon deposition on Pt nanorods at normal incDEence (theta(dep) = 0 degrees) was also performed for comparison. Morphology and elemental analysis of Pt/Teflon nanocomposite structures were carried out using scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDAX), respectively. It was found that the GLAD technique is capable of depositing ultrathin isolated Teflon nanostructures on selective regions of nanorod arrays due to the shadowing effect during obliquely incDEent deposition. Contact angle measurements on nanocomposite Pt nanorods with Teflon nanopatches exhibited contact angle values as high as 138 degrees, indicating a significant increase in the hydrophobicity of originally hydrophilic Pt nanostructures that had an angle of about 52 degrees. The enhanced hydrophobicity of the Pt nanorod/Teflon nanopatch composite is attributed to the presence of nanostructured Teflon coating, which imparted a low surface energy. Surface energy calculations were performed on Pt nanorods, Teflon thin film, and Pt/Teflon composite using the two-liquDE method to confirm the contact angle measurements. Furthermore, a new contact angle model utilizing Cassie and Baxter theory for heterogeneous surfaces was developed in order to explain the enhanced hydrophobicity of Pt/Teflon nanorods. According to our model, it is predicted that the solDE-liquDE interface is mainly at the Teflon tips when the composite nanorods are in contact with water.
机译：通过实验和理论研究了将疏水性引入垂直排列的亲水性金属纳米棒。使用溅射掠角沉积技术（GLAD）将铂纳米棒阵列沉积在平坦的硅基板上。然后在不同的沉积时间下，以θ（dep）= 85度的掠射角将一层特富龙（nanopatch）薄层部分沉积在铂纳米棒的尖端。为了进行比较，还进行了在正常倾斜度（theta（dep）= 0度）下在Pt纳米棒上的特氟隆沉积。 Pt / Teflon纳米复合材料结构的形态和元素分析分别使用扫描电子显微镜（SEM）和能量色散X射线分析（EDAX）进行。发现由于倾斜倾斜沉积期间的遮蔽效应，GLAD技术能够在纳米棒阵列的选择性区域上沉积超薄分离的特氟隆纳米结构。具有Teflon纳米斑的纳米复合Pt纳米棒的接触角测量显示出高达138度的接触角值，表明具有约52度角的最初亲水性Pt纳米结构的疏水性显着提高。 Pt纳米棒/ Teflon纳米贴片复合材料疏水性增强是由于存在纳米结构的Teflon涂层，从而降低了表面能。使用双液法对Pt纳米棒，Teflon薄膜和Pt / Teflon复合材料进行表面能计算，以确认接触角的测量结果。此外，为了解释Pt / Teflon纳米棒增强的疏水性，开发了一种使用Cassie和Baxter理论的非均质表面接触角模型。根据我们的模型，预计当复合纳米棒与水接触时，solDE-liquDE界面主要位于聚四氟乙烯尖端。

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