Department of Chemistry and Biochemistry , Brigham Young University , Provo , Utah 84602 , United States.
Department of Physics and Astronomy , Brigham Young University , Provo , Utah 84602 , United States.
Langmuir. 2018 Dec 11;34(49):15069-15077. doi: 10.1021/acs.langmuir.8b02225. Epub 2018 Sep 12.
Bottom-up nanofabrication is increasingly making use of self-assembled DNA to fabricate nanowires and potential integrated circuits, although yields of such electronic nanostructures are inadequate, as is the ability to reliably make electrical measurements on them. In this paper, we report improved yields and unprecedented conductivity measurements for Au nanowires created on DNA origami tile substrates. We created several different self-assembled Au nanowire arrangements on DNA origami tiles that are approximately 70 nm × 90 nm, through anisotropic growth of Au nanorods attached to specific sites. Modifications to the tile design increased yields of the final desired nanostructures as much as 6-fold. In addition, we measured the conductivity of Au nanowires created on these DNA tiles (∼130 nm long, 10 nm diameter, and 40 nm spacing between measurement points) with a four-point measurement technique that utilized electron beam induced metal deposition to form probe electrodes. These nanowires formed on single DNA origami tiles were electrically conductive, having resistivities as low as 4.24 × 10 Ω m. This work demonstrates the creation and measurement of inorganic nanowires on single DNA origami tiles as a promising path toward future bottom-up fabrication of nanoelectronics.
自下而上的纳米制造越来越多地利用自组装 DNA 来制造纳米线和潜在的集成电路，尽管此类电子纳米结构的产量不足，而且难以可靠地对其进行电测量。在本文中，我们报告了在 DNA 折纸瓦片衬底上制造的 Au 纳米线的产量提高和前所未有的电导率测量。我们通过将 Au 纳米棒附着到特定位置来在大约 70nm×90nm 的 DNA 折纸瓦片上创建了几种不同的自组装 Au 纳米线排列。通过对瓦片设计的修改，最终所需纳米结构的产量提高了 6 倍。此外，我们使用四点测量技术测量了在这些 DNA 瓦片上制造的 Au 纳米线的电导率（约 130nm 长，10nm 直径，测量点之间的间距为 40nm），该技术利用电子束诱导金属沉积形成探针电极。这些在单个 DNA 折纸片上形成的纳米线具有导电性，其电阻率低至 4.24×10 Ω m。这项工作展示了在单个 DNA 折纸片上制造无机纳米线的方法，这是未来自下而上制造纳米电子学的有前途的途径。
