Scanning Tunneling Microscopy Investigation of Tris(phthalocyaninato)yttrium Triple-Decker Molecules Deposited on Au(111)
Scanning Tunneling Microscopy Investigation of Tris(phthalocyaninato)yttrium Triple-Decker Molecules Deposited on Au(111)
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DOI：
10.1021/jp101349v
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发表时间：
2010-07-22
影响因子：
3.7
通讯作者：
Komeda, Tadahiro
中科院分区：
文献类型：
--
作者：
Isshiki, Hironari;Liu, Jie;Komeda, Tadahiro
用低温扫描隧道显微镜（STM）研究了三层三酞菁钇（Y2Pc 3）分子在Au（111）表面的沉积。结果表明，在真空条件下，用升华法可以将三层分子成功地转移到Au（111）表面。观察到Y2Pc 3的单层膜，其从裸Au（111）表面的高度近似为0.55 nm。分子以平躺构型吸附，并形成伪正方形晶格。在每个分子内部，在占据态图像中观察到八个明亮的突起，这些突起对应于顶部酞菁（Pc）中四个苯环两侧的高态密度（DOS）区域。扫描隧道光谱（STS）的数据显示出不同的功能，无论是在占领和未占领的状态。当探针从配体位置移动到分子中心时，STS光谱的变化很小，表明中心金属的贡献有限。
We studied triple-decker tris(phthalocyaninato)yttrium (Y2Pc3) molecules deposited on a Au(111) surface with a low-temperature scanning tunneling microscope (STM). It is shown that the triple-decker molecule can be successfully transferred to the Au(111) surface by a sublimation method in the ultrahigh vacuum condition. A monolayer film of Y2Pc3 is observed with a height of similar to 0.55 nm from the bare Au(111) surface. The molecules are adsorbed with a flat-lying configuration and a pseudosquare lattice is formed. Inside each molecule, eight bright protrusions were observed in the occupied-state images, which correspond to the high density-of-state (DOS) area on both sides of four phenyl rings in the top phthalocyanine (Pc). Scanning tunneling spectroscopy (STS) data show distinct features both in occupied and in unoccupied states. The variation of STS spectra when the tip moved from the ligand position to the center of the molecule was small, showing a limited contribution from the center metal.