Halogen-bond driven self-assembly of perfluorocarbon monolayers on silicon nitride
Halogen-bond driven self-assembly of perfluorocarbon monolayers on silicon nitride
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DOI：
10.1039/c9ta04620h
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发表时间：
2019-11-14
影响因子：
11.9
通讯作者：
Neto, Chiara
中科院分区：
文献类型：
--
作者：
Abate, Antonio;Dehmel, Raphael;Neto, Chiara
有机分子在基底上的单层自组装是修饰表面和界面性质的有力策略。硫醇盐、硅烷、膦酸盐和羧酸盐是广泛使用的将有机分子连接到特定表面的头基。在这项研究中，我们表明，自组装的全氟十二烷基碘（I-PFC 12）在氮化硅衬底上导致稳定和高度紧凑的单层的可重复的厚度（2.6 nm）。值得注意的是，单分子膜具有有史以来最低的表面能2.6 mJ m（-2）。最有可能的机制，导致形成的单分子膜是卤素键合之间的碘在I-PFC 12和氮和氧原子的氮化物。作为一种方便，灵活和简单的方法，卤素键驱动的全氟化碳单分子膜的自组装是兼容的几个应用，从生物传感到电子和微流体。与其他用于表面和界面功能化的方法相比，我们的方法具有独特的优势，可用于极惰性的全氟溶剂。我们证明，通常不稳定的表面接触许多常见的有机溶剂，如有机-无机钙钛矿，可以通过卤素键合功能化。
The self-assembly of a single layer of organic molecules on a substrate is a powerful strategy to modify surfaces and interfacial properties. Thiolates, silanes, phosphonates and carboxylates are widely used head-groups to link organic molecules to specific surfaces. In this study we show that self-assembly of perfluorododecyl iodide (I-PFC12) on a silicon nitride substrate leads to stable and highly compact monolayers of reproducible thickness (2.6 nm). Remarkably, the monolayers have the lowest ever reported surface energy of 2.6 mJ m(-2). The most likely mechanism leading to the formation of the monolayers is halogen bonding between the iodine in I-PFC12 and the nitrogen and oxygen atoms on the nitride. As a convenient, flexible and simple method, the self-assembly of halogen-bond driven perfluorocarbon monolayers is compatible with several applications, ranging from biosensing to electronics and microfluidics. Compared to other methods used to functionalise surfaces and interfaces, our procedure offers the unique advantage to work with extremely inert perfluorinated solvents. We demonstrate that surfaces commonly unstable in contact with many common organic solvents, such as organic-inorganic perovskites, can be functionalized via halogen bonding.