Differential conductance measurements of single test molecules on various supports by lowtemperature STM to quantify the influence of molecule-support and inter-molecular interactions on a molecular electronic system

通过低温 STM 对各种支撑物上的单个测试分子进行微分电导测量，以量化分子支撑物和分子间相互作用对分子电子系统的影响

• 批准号: 25125621
• 负责人: Professor Dr. Niklas Nilius
• 金额: --
• 依托单位: Institut für Physik (IFP)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/25125621?language=en
• 关键词: Differential; conductance; measurements; single; test

The major objective of this project will be a study of the evolution of electronic and conductance properties of single molecules, investigated as a function of (i) coupling strength to a support and (ii) inter-molecular interactions. For this purpose, simple alkanes and pconjugated molecules are deposited on surfaces exerting different binding strengths towards molecules, such as inert oxide, semiconductor and metal surfaces. The molecular density of states (DOS) is probed by conductance spectroscopy with a low-temperature STM. The experiments will provide information on the energy levels of nearly decoupled molecules as well as strongly bound molecule-substrate units, thus reflecting the influence of bond formation on the molecular electronic system. The results can serve as input parameters for a theoretical modelling of the respective systems, performed by participating groups of this Schwerpunktprogramm. In a second step, well-defined molecular assemblies are formed by manipulation of individual molecules with the STM tip. These experiments focus on the influence of inter-molecular interactions on the DOS and on the possibility to form coupled molecular systems. Conductance measurements are complemented by vibrational and optical spectroscopy of single molecules with the STM, generating additional data on binding strength and level positions in the molecules. The project aims to provide information, how the transport properties of a molecular junction can be controlled by a systematic modifications of molecule-support and inter-molecular interactions.

该项目的主要目标是研究单分子的电子和电导性质的演变，研究其作为（i）与支持物的耦合强度和（ii）分子间相互作用的函数。为此，简单烷烃和p共轭分子沉积在对分子施加不同结合强度的表面上，例如惰性氧化物、半导体和金属表面。用低温STM电导谱探测分子态密度。这些实验将提供关于几乎解耦的分子以及强结合的分子-基底单元的能级的信息，从而反映键形成对分子电子系统的影响。结果可以作为输入参数的理论建模的各个系统，由参与小组的Schwerpunktprogramm。在第二步中，通过用STM尖端操纵单个分子来形成定义明确的分子组装体。这些实验的重点是分子间相互作用对DOS的影响和形成耦合分子系统的可能性。电导测量是补充振动和光谱的单分子与STM，产生额外的数据结合强度和水平的位置在分子中。该项目旨在提供信息，如何通过分子支撑和分子间相互作用的系统修饰来控制分子结的传输特性。