纳米有源器件中均匀分子间隙的精确制备
Precise Fabrication of Uniform Molecular Gaps for Active Nanoscale Devices
摘要：
具有多功能性和明确结构的分子可以作为极端纳米器件的构建块。这需要它们精确地整合到功能异质结中，最常见的是金属-分子-金属架构的形式。然而，目前的制造技术所造成的结构损伤和不均匀性，限制了它们的有效结合。在这里，我们提出了一种混合制造方法，使均匀的分子间隙。使用具有亚纳米粗糙度的模板剥离光刻图案化的金电极作为底部接触，在其上通过自组装形成分子层。使用胶体金纳米棒的介电泳捕获组装顶部接触，从而产生均匀的亚5 nm结。在这些电活性设计中，我们进一步探索了机械可调谐性的可能性。分子的存在可以帮助控制亚纳米机械调制，由于表面粘附力引起的不稳定性，亚纳米机械调制通常难以实现。我们的方法是多功能的，提供了一个平台，开发和研究活性分子的差距对功能纳米器件。
英文摘要：
Molecules with versatile functionalities and well-defined structures, can serve as building blocks for extreme nanoscale devices. This requires their precise integration into functional heterojunctions, most commonly in the form of metal-molecule-metal architectures. Structural damage and nonuniformities caused by current fabrication techniques, however, limit their effective incorporation. Here, we present a hybrid fabrication approach enabling uniform molecular gaps. Template-stripped lithographically-patterned gold electrodes with sub-nanometer roughness are used as the bottom contacts upon which the molecular layer is formed through self-assembly. The top contacts are assembled using dielectrophoretic trapping of colloidal gold nanorods, resulting in uniform sub-5 nm junctions. In these electrically-active designs, we further explore the possibility of mechanical tunability. The presence of molecules may help control sub-nanometer mechanical modulation which is conventionally difficult to achieve due to instabilities caused by surface adhesive forces. Our approach is versatile, providing a platform to develop and study active molecular gaps towards functional nanodevices.
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