Directly addressable sub-3 nm gold nanogaps fabricated by Nanoskiving using self-assembled monolayers as templates

ACS Nano
Parisa Pourhossein, Ryan C Chiechi

Abstract

This paper describes the fabrication of electrically addressable, high-aspect-ratio (>10000:1) nanowires of gold with square cross sections of 100 nm on each side that are separated by gaps of 1.7-2.2 nm which were defined using self-assembled monolayers (SAMs) as templates. We fabricated these nanowires and nanogaps without a clean room or any photo- or electron-beam lithographic processes by mechanically sectioning sandwich structures of gold separated by a SAM using an ultramicrotome. This process is a form of edge lithography known as Nanoskiving. These wires can be manually positioned by transporting them on drops of water and are directly electrically addressable; no further lithography is required to connect them to an electrometer. Once a block has been prepared for Nanoskiving (which takes less than one day), hundreds of thousands of nanogaps can be generated, on demand, at a rate of about one nanogap per second. After ashing the organic components with oxygen plasma, we measured the width of a free-standing gap formed from a SAM of 16-mercaptodohexanoic acid (2.4 nm in length) of 2.6 ± 0.5 nm by transmission electron microscopy. By fitting current-voltage plots of unashed gaps containing three alkanedithiolates of dif...Continue Reading

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Citations

Feb 19, 2016·Advanced Materials·Ziwei ZhouGang Zhang
Aug 19, 2015·ACS Applied Materials & Interfaces·Chanchal ChakrabortyMasayoshi Higuchi
Jul 24, 2015·Nanoscale·Huilong Hou, Reginald F Hamilton
Nov 6, 2013·Journal of the American Chemical Society·Felice C SimeoneGeorge M Whitesides
Feb 1, 2018·Physical Chemistry Chemical Physics : PCCP·Jiahao ChenMartin M Thuo
Nov 1, 2017·ACS Applied Materials & Interfaces·Seo Eun ByeonHyo Jae Yoon

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