BNLMS, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China.
Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics , Peking University , Beijing 100871 , China.
ACS Nano. 2018 Mar 27;12(3):2991-2997. doi: 10.1021/acsnano.8b00751. Epub 2018 Mar 2.
Charge states of lanthanide double-decker phthalocyanines complexes significantly influence their geometrical structures and magnetic properties. In this study, the charge states of single DyPc molecules on an ultrathin CuO film were detected by scanning tunneling microscopy and spectroscopy in magnetic fields. Four types of adsorptions of DyPc molecules on CuO were experimentally observed. Without applying voltages, two of them were positively charged with the other two at the neutral state. By controlling the sample bias, two types of neutral molecules can be switched to the positively and negatively charged states, respectively. This manipulation was not realized for the DyPc cations. A way to precisely detect the molecular charge states with and without current is beneficial for the development of molecular electronics.
镧系元素双层酞菁配合物的电荷态显著影响其几何结构和磁性能。本研究通过扫描隧道显微镜和光谱学在磁场中检测了超薄 CuO 薄膜上单个 DyPc 分子的电荷态。实验观察到 DyPc 分子在 CuO 上的四种吸附方式。在不施加电压的情况下，其中两种呈正电荷态，另外两种处于中性态。通过控制样品偏压，可以将两种中性分子分别切换到正电荷态和负电荷态。但对于 DyPc 阳离子，这种操作无法实现。这种无需电流即可精确检测分子电荷态的方法有助于分子电子学的发展。
