Sun Jian, Akiba Uichi, Fujihira Masamichi
Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8501, Japan.
Ultramicroscopy. 2008 Sep;108(10):1034-9. doi: 10.1016/j.ultramic.2008.04.031. Epub 2008 May 8.
Stretch lengths of pure gold mono-atomic wires have been studied recently with an electrochemical scanning tunneling microscope (STM). Here, we will report a study of stretch lengths of gold mono-atomic wires with and without 1,6-hexanedithiol (HDT) using the STM break-junction method. First, the stretch length was measured as a function of electrode potentials of a bare Au(111) substrate and a gold STM tip in a 0.1 M NaClO4 aqueous solution. Second, a self-assembled monolayer (SAM) was fabricated on an Au(111) substrate by dipping the substrate into a 1 mM HDT ethanol solution. At last, we measured the stretch length of gold mono-atomic wires on a substrate covered with the SAM in place of the bare Au(111) substrate. We compared the electrode potential dependence of the stretch lengths of gold mono-atomic wires covered with and without HDT. We will discuss the effect of the electrode potential on the stretch lengths by taking account of electrocapillarity of gold mono-atomic wires.
最近，人们利用电化学扫描隧道显微镜（STM）对纯金单原子线的拉伸长度进行了研究。在此，我们将报告一项使用STM断结法对有无1,6 - 己二硫醇（HDT）的金单原子线拉伸长度的研究。首先，在0.1 M高氯酸钠水溶液中，测量了裸Au(111)基底和金STM针尖的电极电位与拉伸长度之间的函数关系。其次，通过将Au(111)基底浸入1 mM HDT乙醇溶液中，在其上制备了自组装单分子层（SAM）。最后，我们测量了覆盖有SAM的基底上的金单原子线的拉伸长度，以取代裸Au(111)基底。我们比较了有无HDT覆盖的金单原子线拉伸长度对电极电位的依赖性。我们将通过考虑金单原子线的电毛细现象来讨论电极电位对拉伸长度的影响。
