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Growth of metal nanowires of tunable width

机译:宽度可调的金属纳米线的生长

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摘要

Using scanning tunneling microscopy and low-energy electron diffraction it is demonstrated that the deposition of nickel on the hydrogen-stabilized (5×1)-H phase of Ir(100) leads to the formation of nickel nanowires of tunable widths and of lengths up to the order of 0.1 μm. The tuning parameter is the number n of full monolayers deposited on the substrate: with that layer completed the next layer starts to grow by forming nanowires of n-atomic width whereby n is in the range 2≤n≤5. The formation of the wires is interpreted as decoration or induction of stair rod dislocations which-as we reported earlier-develop to release the 9.0% pseudomorphic tensile strain of the full nickel layers. They lead to long sunk-in wedges at the surface whose width grows linearly with the number of layers deposited and so, by their decoration, nanowires of corresponding width develop. The wedges, and so the Ni wires, appear above single-atomic and macroscopically long Ir wires of the Ir(100)-(5 × 1)-H substrate which pin the dislocations. Above n=6, however, the films become rough and develop a squarelike patterning. It is speculated that the deposition of other metals with the same order of pseudomorphic strain should develop similar nanowires.
机译:使用扫描隧道显微镜和低能电子衍射表明,在Ir(100)的氢稳定(5×1)-H相上沉积镍导致形成宽度可调且长度可调的镍纳米线。达到0.1μm的数量级。调整参数是沉积在基板上的完整单层的数量n:完成该层后,下一层将通过形成n原子宽度的纳米线开始生长,从而n在2≤n≤5的范围内。线材的形成被解释为是楼​​梯杆位错的装饰或诱发,正如我们先前报道的那样,该杆位错释放了整个镍层的9.0%拟晶拉伸应变。它们导致表面上的长沉入楔形,其宽度随沉积的层数线性增长,因此通过装饰,可以形成相应宽度的纳米线。楔形物以及镍丝出现在固定位错的Ir(100)-(5×1)-H衬底的单原子且宏观长的Ir丝上方。然而,当n = 6以上时,膜变得粗糙并形成正方形图案。可以推测,具有相同数量的假晶应变的其他金属的沉积应形成相似的纳米线。

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  • 来源
    《Physical review》 |2010年第11期|p.115431.1-115431.5|共5页
  • 作者单位

    Lehrstuhl fuer Festkoerperphysik, Universitaet Erlangen-Nuernberg, Staudtstr. 7, D-91058 Erlangen, Germany;

    rnLehrstuhl fuer Festkoerperphysik, Universitaet Erlangen-Nuernberg, Staudtstr. 7, D-91058 Erlangen, Germany;

    rnLehrstuhl fuer Festkoerperphysik, Universitaet Erlangen-Nuernberg, Staudtstr. 7, D-91058 Erlangen, Germany;

    rnLehrstuhl fuer Festkoerperphysik, Universitaet Erlangen-Nuernberg, Staudtstr. 7, D-91058 Erlangen, Germany;

    rnLehrstuhl fuer Festkoerperphysik, Universitaet Erlangen-Nuernberg, Staudtstr. 7, D-91058 Erlangen, Germany;

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  • 正文语种 eng
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  • 关键词

    solid surfaces and solid-solid interfaces: structure and energetics; metallic surfaces; thin film structure and morphology;

    机译:固体表面和固体-固体界面:结构和能量学;金属表面;薄膜的结构和形态;

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