期刊
NANO LETTERS
卷 11, 期 6, 页码 2236-2241出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl200294s
关键词
Single molecule conductance; molecular electronics; STM; break junction; nanoelectronics; fullerene
类别
资金
- MICINN (Spain) [MAT2008-01735, CTQ2008-00795, CSD-2007-00010]
- CAM [S2009PPQ/1533, S2009/MAT-1720]
- EC [212942]
- IMDEA
- [RYC-2008-03328]
One of the challenging goals of molecular electronics is to wire exactly one molecule between two electrodes. This is generally nontrivial under ambient conditions. We describe a new and straightforward protocol for unambiguously isolating a single organic molecule on a metal surface and wiring it inside a nanojunction under ambient conditions. Our strategy employs C-60 terminal groups which act as molecular beacons allowing molecules to be visualized and individually targeted on a gold surface using an scanning tunneling microscope. After isolating one molecule, we then use the C-60 groups as alligator clips to wire it between the tip and surface. Once wired, we can monitor how the conductance of a purely one molecule junction evolves with time, stretch the molecule in the junction, observing characteristic current plateaus upon elongation, and also perform direct I-V spectroscopy. By characterizing and controlling the junction, we can draw stronger conclusions about the observed variation in molecular conductance than was previously possible.
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