Selective analysis of molecular states by functionalized scanning tunneling microscopy tips
Selective analysis of molecular states by functionalized scanning tunneling microscopy tips
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通过功能化扫描隧道显微镜尖端选择性分析分子态
DOI：
10.1103/physrevlett.96.156102
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发表时间：
2006-04-21
影响因子：
8.6
通讯作者：
Gao, HJ
中科院分区：
文献类型：
--
作者：
Deng, ZT;Lin, H;Gao, HJ
迄今为止，通过调整扫描隧道显微镜在高分辨率测量中的偏压范围，已经在一些情况下实现了扫描隧道显微镜（STM）中分子状态的选择性分析。相应地，在Ag（110）上紧密堆积的单层中吸附的苝主要通过分子的pi态进行成像。相比之下，用苝分子功能化STM尖端会导致STM尖端和分子吸附之间的能级不匹配，相反，只能成像下层银表面的金属状态。这一发现为通过有机界面进行电子传递测量提供了一条更好的能量选择性途径。
Selective analysis of molecular states in scanning tunneling microscopy (STM) has so far been achieved in a few cases by tuning the bias range of the STM in high-resolution measurements. Correspondingly, perylene adsorbed in a close-packed monolayer on Ag(110) is imaged mainly through the pi states of the molecule. By contrast, functionalizing the STM tip with a perylene molecule leads to a mismatch between the energy levels of the STM tip and the molecule adsorbates and, instead, images only the metal states of the underlying silver surface. The observation opens a route for better energy selectivity in electron transport measurements through organic interfaces.