Abstract
Heteroepitaxial growth is demonstrated by electroless Au plating (ELGP) on polycrystalline Pt surface and initial ultrafine-linewidth Pt nanogap electrodes, confirmed by scanning transmission electron microscope cross-sectional images, atomic-resolution scanning electron microscope images, and energy-dispersive X-ray spectroscopy elemental maps. The gap between a pair of spherical multidomain heteroepitaxial Au on Pt electrodes of radius 5 nm is controlled to a value as small as 0.7 nm by the self-termination mechanism of ELGP without short circuit. The heteroepitaxial spherical Au/Pt nanogap electrodes are found to be robust against annealing at temperatures up to 573 K.
Highlights
Heteroepitaxial growth is demonstrated by electroless Au plating (ELGP) on polycrystalline Pt surface and initial ultrafine-linewidth Pt nanogap electrodes, confirmed by scanning transmission electron microscope cross-sectional images, atomic-resolution scanning electron microscope images, and energy-dispersive X-ray spectroscopy elemental maps
The heteroepitaxial spherical Au/Pt nanogap electrodes are found to be robust against annealing at temperatures up to 573 K
The most commonly reported methods for the fabrication of nanogap electrodes include electromigration, electroplating, and oblique evaporation.2–6) Molecular transistors have been prepared by introducing molecules into nanogap electrodes, and have been reported as SETs and Fowler-Nordheim transistors; measurement temperatures tend to be limited at low temperatures like 4 K.8–14)
Summary
View the article online for updates and enhancements. This content was downloaded from IP address 126.208.194.36 on 14/11/2019 at 14:59. Received October 15, 2019; revised October 19, 2019; accepted October 28, 2019; published online November 14, 2019. Heteroepitaxial growth is demonstrated by electroless Au plating (ELGP) on polycrystalline Pt surface and initial ultrafine-linewidth Pt nanogap electrodes, confirmed by scanning transmission electron microscope cross-sectional images, atomic-resolution scanning electron microscope images, and energy-dispersive X-ray spectroscopy elemental maps. The gap between a pair of spherical multidomain heteroepitaxial Au on Pt electrodes of radius 5 nm is controlled to a value as small as 0.7 nm by the self-termination mechanism of ELGP without short circuit. The heteroepitaxial spherical Au/Pt nanogap electrodes are found to be robust against annealing at temperatures up to 573 K
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