Controlled Fabrication of DNA Molecular Templates for In Situ Formation and Measurement of Ultrathin Metal Nanostructures
Controlled Fabrication of DNA Molecular Templates for In Situ Formation and Measurement of Ultrathin Metal Nanostructures
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DOI：
10.1021/acs.nanolett.0c03166
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发表时间：
2020-11-11
期刊：
影响因子：
10.8
通讯作者：
Xiong, Peng
中科院分区：
文献类型：
--
作者：
Barreda, Jorge L.;Hu, Longqian;Xiong, Peng
金属纳米结构的制造通常需要高真空沉积和生长后处理的某种组合，这排除了对大多数材料的超小横截面的纳米结构的访问。DNA纳米线是一种多用途的绝缘模板，其线宽小于10 nm.在这里，我们展示了一种精确控制DNA纳米线的位置和方向的DNA模板制造方法。我们进一步证明，该模板可用于支持衍生物纳米器件的金属纳米线的形成：金属是递增沉积的，并且在每个步骤中原位进行电输运测量。结果表明，获得了厚度小至0.9 nm的均匀金属NW，其横截面仅为几nm（2）。该方法对DNA纳米线的位置、分离和取向的高度控制为基于金属纳米线的复杂纳米器件的制备提供了巨大的希望。
Fabrication of ultrathin metal nanostructures usually requires some combination of high-vacuum deposition and postgrowth processing, which precludes access to nanostructures of ultrasmall cross sections for most materials. DNA nanowires (NWs) are versatile insulating templates with intrinsic sub-10 nm line width. Here, we demonstrate a method of DNA template fabrication with precise control over the location and orientation of the DNA NWs. We further demonstrate that this template can be used to support formation of ultrathin metal NWs for derivative nanodevices: a metal is incrementally deposited, and electrical transport measurement is performed in situ at each step. The results show a homogeneous metal NW is obtained at a thickness as small as 0.9 nm with a cross-section of only a few nm(2). The high degree of control in the location, separation, orientation of the DNA NWs affords this method great promise in fabricating complex nanodevices based on metal NWs.