Bellec Amandine, Ample Francisco, Riedel Damien, Dujardin Gérald, Joachim Christian
Laboratoire de Photophysique Moleculaire, CNRS, Bat. 210, Universite Paris Sud, 91405 Orsay, France, and CEMES-CNRS, 29 rue J. Marvig, P.O. Box 4347, F-31055 Toulouse Cedex, France.
Nano Lett. 2009 Jan;9(1):144-7. doi: 10.1021/nl802688g.
Decoupling the electronic properties of a molecule from a substrate is of crucial importance for the development of single-molecule electronics. This is achieved here by adsorbing pentacene molecules at low temperature on a hydrogenated Si(100) surface (12 K). The low temperature (5 K) scanning tunneling microscope (STM) topography of the single pentacene molecule at the energy of the highest occupied molecular orbital (HOMO) tunnel resonance clearly resembles the native HOMO of the free molecule. The negligible electronic coupling between the molecule and the substrate is confirmed by theoretical STM topography and diffusion barrier energy calculations.
将分子的电子特性与衬底解耦对于单分子电子学的发展至关重要。本文通过在低温（12K）下将并五苯分子吸附在氢化硅（100）表面来实现这一点。在最高占据分子轨道（HOMO）隧道共振能量下，单个并五苯分子的低温（5K）扫描隧道显微镜（STM）形貌明显类似于自由分子的天然HOMO。理论STM形貌和扩散势垒能量计算证实了分子与衬底之间可忽略不计的电子耦合。
