Characteristics of Amine-Ended and Thiol-Ended Alkane Single-Molecule Junctions Revealed by Inelastic Electron Tunneling Spectroscopy
Characteristics of Amine-Ended and Thiol-Ended Alkane Single-Molecule Junctions Revealed by Inelastic Electron Tunneling Spectroscopy
复制标题
DOI：
10.1021/nn200759s
复制
发表时间：
2011-05-01
期刊：
影响因子：
17.1
通讯作者：
Scheer, Elke
中科院分区：
文献类型：
--
作者：
Kim, Youngsang;Hellmuth, Thomas Julian;Scheer, Elke
通过对单分子结电荷输运的实验和理论分析，确定了分子端基对增加电极分离的影响。对于与金电极接触的胺端辛烷和巯基端辛烷，我们通过分析电导轨迹中的扭结、结长度和非弹性电子隧道能谱来研究链形成的特征。结果表明，对于胺端分子连接，拉伸时没有原子链被拉断，而对于硫醇端分子连接，Au电极强烈变形。因此，这种先进的方法提供了明确的证据，证明胺锚只与金弱结合。
A combined experimental and theoretical analysis of the charge transport through single-molecule junctions Is performed to define the influence of molecular end groups for Increasing electrode separation. For both amine-ended and thiol-ended octanes contacted to gold electrodes, we study signatures of chain formation by analyzing kinks in conductance traces, the junction length, and inelastic electron tunneling spectroscopy. The results show that for amine-ended molecular junctions no atomic chains are pulled under stretching, whereas the Au electrodes strongly deform for thiol-ended molecular junctions. This advanced approach hence provides unambiguous evidence that the amine anchors bind only weakly to Au.