Kühne Tim, Au-Yeung Kwan Ho, Eisenhut Frank, Aiboudi Oumaima, Ryndyk Dmitry A, Cuniberti Gianaurelio, Lissel Franziska, Moresco Francesca
Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany.
Nanoscale. 2020 Dec 23;12(48):24471-24476. doi: 10.1039/d0nr06809h.
Among the different mechanisms that can be used to drive a molecule on a surface by the tip of a scanning tunneling microscope at low temperature, we used voltage pulses to move azulene-based single molecules and nanostructures on Au(111). Upon evaporation, the molecules partially cleave and form metallo-organic dimers while single molecules are very scarce, as confirmed by simulations. By applying voltage pulses to the different structures under similar conditions, we observe that only one type of dimer can be controllably driven on the surface, which has the lowest dipole moment of all investigated structures. Experiments under different bias and tip height conditions reveal that the electric field is the main driving force of the directed motion. We discuss the different observed structures and their movement properties with respect to their dipole moment and charge distribution on the surface.
在低温下利用扫描隧道显微镜尖端在表面驱动分子的不同机制中，我们使用电压脉冲在Au(111)上移动基于薁的单分子和纳米结构。蒸发后，分子会部分裂解并形成金属有机二聚体，而单分子非常稀少，模拟结果证实了这一点。在相似条件下对不同结构施加电压脉冲时，我们观察到表面上只有一种类型的二聚体能够被可控驱动，该二聚体在所有研究结构中偶极矩最低。在不同偏置和针尖高度条件下进行的实验表明，电场是定向运动的主要驱动力。我们根据表面上的偶极矩和电荷分布讨论了观察到的不同结构及其移动特性。
