Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy
Orientation of molecular interface dipole on metal surface investigated by noncontact atomic force microscopy
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DOI：
10.1007/s11434-013-5977-x
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发表时间：
2013-07
影响因子：
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通讯作者：
Bingkai Yuan;Pengcheng Chen;Jun Zhang;Zhihai Cheng;Xiaohui Qiu;Chen Wang
中科院分区：
文献类型：
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作者：
Bingkai Yuan;Pengcheng Chen;Jun Zhang;Zhihai Cheng;Xiaohui Qiu;Chen Wang
我们使用扫描隧道显微镜（STM）和非接触原子力显微镜（NC-AFM）研究了Cu（111）和Cu（100）基板上单个非平面钛氧基酞菁（TiOPc）分子的界面偶极矩的方向。明确确定了对应于单个 TiOPc 分子的两种不同构型的偶极矩方向。基于亚分子分辨率成像和局部接触电位差（LCPD）测量，提出了实际分子结构与相应的STM形貌之间的相关性。与原始基材相比，非平面分子吸附引起的 LCPD 位移取决于永久分子偶极子、表面与分子之间的电荷转移以及分子构型。这项工作将为通过极性分子吸附定制界面电子特性和控制局部物理特性提供线索。
We investigated the orientations of interface dipole moments of individual non-planar titanyl phthalocyanine (TiOPc) molecules on Cu(111) and Cu(100) substrates using scanning tunneling microscope (STM) and noncontact atomic force microscope (NC-AFM). The dipole moment orientations corresponding to two different configurations of individual TiOPc molecules were determined unambiguously. The correlation between the actual molecular structures and the corresponding STM topographies is proposed based on the sub-molecular resolution imaging and local contact potential difference (LCPD) measurements. Comparing with the pristine substrate, the LCPD shift due to the adsorption of non-planar molecule is dependent on the permanent molecular dipole, the charge transfer between the surface and the molecule, and the molecular configurations. This work would shed light on tailoring interfacial electronic properties and controlling local physical properties via polar molecule adsorption.