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Understanding and tuning the epitaxy of large aromatic adsorbates by molecular design

机译:通过分子设计理解和调整大型芳香族吸附物的外延

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If the rich functionality of organic molecules is to be exploited in devices such as light-emitting diodes or field-effect transistors(1-7), interface properties of organic materials with various (metallic and insulating) substrates must be tailored carefully(7-10). In many cases, this calls for well-ordered interfaces. Organic epitaxy(11-13) that is, the growth of molecular films with a commensurate structural relationship to their crystalline substrates-relies on successful recognition of preferred epitaxial sites. For some large pi-conjugated molecules ('molecular platelets') this works surprisingly well(14,15), even if the substrate exhibits no template structure into which the molecules can lock(13, 15,16). Here we present an explanation for site recognition in non-templated organic epitaxy, and thus resolve a long-standing puzzle(11).We propose that this form of site recognition relies on the existence of a local molecular reaction centre in the extended pi-electron system of the molecule. Its activity can be controlled by appropriate side groups and-in a certain regime-may also be probed by molecularly sensitized scanning tunnelling microscopy. Our results open the possibility of engineering epitaxial interfaces, as well as other interfacial nanostructures for which specific site recognition is essential. [References: 30]
机译:如果要在诸如发光二极管或场效应晶体管之类的设备中利用有机分子的丰富功能(1-7),则必须谨慎地定制有机材料与各种(金属和绝缘)衬底的界面特性(7- 10)。在许多情况下,这需要有序的接口。有机外延(11-13),即与其晶体基质具有适当结构关系的分子膜的生长,取决于成功识别优选的外延位点。对于一些大的π共轭分子(“分子血小板”),即使底物没有分子可锁定的模板结构,其效果也很好(14,15)。在这里,我们为非模板有机外延中的位点识别提供了一个解释,从而解决了一个长期存在的难题(11)。我们建议这种形式的位点识别依赖于扩展的pi-中的局部分子反应中心的存在。分子的电子系统。它的活性可以通过适当的侧基来控制,并且在某些情况下,还可以通过分子敏化扫描隧道显微镜来探测。我们的结果打开了工程外延界面以及其他特定位置识别必不可少的界面纳米结构的可能性。 [参考:30]

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