Probing potential-tuned resonant tunneling through redox molecules with scanning tunneling microscopy
Probing potential-tuned resonant tunneling through redox molecules with scanning tunneling microscopy
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DOI：
10.1103/physrevlett.76.4066
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发表时间：
1996-05-20
影响因子：
8.6
通讯作者：
Tao, NJ
中科院分区：
文献类型：
--
作者：
Tao, NJ
我们用扫描隧道显微镜(STM)研究了水溶液中吸附在导电衬底上的氧化还原分子的电子转移。通过调节衬底电势，衬底和针尖的费米能级可以很容易地相对于分子的能级进行移动。将费米能级与能级对齐，观察到由于共振隧穿，在衬底和STM针尖之间流经分子的隧穿电流增加了近十倍。本实验还表明，基于STM的不同氧化还原性质，可以用STM来识别结构相似的分子。
We have studied electron transfer through redox molecules adsorbed on a conductive substrate with scanning tunneling microscopy (STM) in aqueous solution. By adjusting the substrate potential, the Fermi levels of the substrate and tip can be easily shifted relative to the energy levels of the molecules. Aligning the Fermi levels to an energy level, a nearly tenfold increase in the tunneling current that flows between the substrate and the STM tip via the molecules, due to resonant tunneling is observed. This experiment also shows that structurally similar molecules may be identified with STM based on their different redox properties.