Ai Yong, Smida Hassiba, Ghilane Jalal, Vilà Neus, Ghanbaja Jaafar, Walcarius Alain, Lacroix Jean Christophe
Université Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS, 15 rue Jean-Antoine de Baïf, F-75205, Paris, Cedex 13, France.
Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, UMR 7564 CNRS and Université de Lorraine, 405 rue de Vandoeuvre, F-54600, Villers-lès-Nancy, France.
Sci Rep. 2017 Dec 19;7(1):17752. doi: 10.1038/s41598-017-17048-z.
The formation of copper atomic contacts has been investigated. Copper nanowires were grown by electrochemical deposition, in the scanning electrochemical microscopy (SECM) configuration, from a platinum microelectrode to an indium tin oxide (ITO) substrate. Self-termination leaves copper filaments between the two electrodes with an atomic point contact at the ITO electrode. Histogram analysis shows that the conductance of this contact is close to, or less than, 1 G. Atomic contacts were also fabricated on ITO electrodes covered with vertically-aligned mesoporous silica films. Scanning Transmission Electron Microscopy images show that copper filaments occupy individual isolated nanopores. Contacts generated on bare ITO break down rapidly in sodium salicylate, whereas those generated in ITO/nanopores are unaffected; the nanopores protect the copper filaments. Finally, atomic switch behaviour was obtained using these ITO and ITO/nanopores electrodes.
已对铜原子接触的形成进行了研究。在扫描电化学显微镜（SECM）配置中，通过电化学沉积从铂微电极到铟锡氧化物（ITO）基板生长铜纳米线。自终止在两个电极之间留下铜丝，在ITO电极处形成原子点接触。直方图分析表明，这种接触的电导接近或小于1 G。还在覆盖有垂直排列的介孔二氧化硅膜的ITO电极上制造了原子接触。扫描透射电子显微镜图像显示铜丝占据单个孤立的纳米孔。在裸ITO上产生的接触在水杨酸钠中会迅速分解，而在ITO/纳米孔中产生的接触则不受影响；纳米孔保护铜丝。最后，使用这些ITO和ITO/纳米孔电极获得了原子开关行为。
