Investigating the inside of individual molecules by means of Kelvin Probe and Atomic Force Microscopy

通过开尔文探针和原子力显微镜研究单个分子的内部

• 批准号: 249365894
• 负责人: Professor Dr. Jascha Repp
• 金额: --
• 依托单位: Institut für Experimentelle und Angewandte Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/249365894?language=en
• 关键词: Investigating; inside; individual; molecules; means

Recently, AFM imaging of individual molecules with functionalized tips provided an unprecedented resolution of the structure of individual molecules. In addition to providing higher spatial resolution, functionalized tips have the advantage that the short-range interaction between tip and sample is well-defined. This enables an unprecedented control over the imaging process and allows for a much better theoretical description of the underlying physical processes. This does not only apply to imaging, but also to different spectroscopy modes, ranging from 3D-force mapping to Kelvin probe force spectroscopy. The aim of this project is make use of these novel possibilities by studying (i) molecular interactions with intra-molecular spatial resolution and (ii) the polarity of bonds and their response to local fields. Three-dimensional force field mapping and Kelvin probe force spectroscopy shall provide this information at ultimate resolution, for which the frequency shift, local contact potential difference, and the curvature of the Kelvin parabola carry complementary information. To establish the relationship between experimental results and the underlying physical and chemical mechanisms, the experiments will be complemented by simulations from our collaboration partner.

最近，原子力显微镜成像的个别分子与功能化的提示提供了一个前所未有的分辨率的个别分子的结构。除了提供更高的空间分辨率之外，功能化的尖端具有尖端和样品之间的短程相互作用是明确定义的优点。这使得能够对成像过程进行前所未有的控制，并允许对潜在的物理过程进行更好的理论描述。这不仅适用于成像，也适用于不同的光谱模式，从三维力映射到开尔文探针力光谱。该项目的目的是利用这些新的可能性，通过研究（i）分子内空间分辨率的分子相互作用和（ii）键的极性及其对局部场的响应。三维力场标测和Kelvin探针力谱应在最终分辨率下提供该信息，其中频移、局部接触电位差和Kelvin抛物线的曲率携带补充信息。为了建立实验结果与基础物理和化学机制之间的关系，我们的合作伙伴将通过模拟来补充实验。

项目成果

Local tunneling decay length and Kelvin probe force spectroscopy

局部隧道衰减长度和开尔文探针力谱

• DOI: 10.1103/physrevb.92.235443
• 发表时间: 2015
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: F. Albrecht;M. Fleischmann;M. Scheer;L. Gross;J. Repp
• 通讯作者: J. Repp

Visualisierung der Polarität chemischer Bindungen

可视化化学键的极性

• DOI: 10.1002/piuz.201590099
• 发表时间: 2015
• 期刊: Physik in unserer Zeit
• 作者: J. Repp;F. Albrecht;M. Fleischmann;M. Scheer
• 通讯作者: M. Scheer