Faculty Publications

Preparation Of Ultrathin Gold Films With Subatomic Surface Roughness

Document Type

Article

Journal/Book/Conference Title

Langmuir

Volume

37

Issue

31

First Page

9472

Last Page

9477

Abstract

Nanoscale device fabrication requires control over film growth at the atomic scale. Growth conditions must be tuned in consideration of interface parameters like chemical bonding, surface free energy, and lattice matching. In metals, electronic properties may also be utilized for control of physical parameters. Quantum size effects can induce metals to spontaneously form specific shapes and sizes according to their electronic structure. Unfortunately, such electronic growth is generally known only for a few systems and is typically only stable under cryogenic conditions. In this work, we explore a recently discovered class of electronic growth systems in which metal films are grown upon the relatively inert surfaces of van der Waals crystals. In this class of materials, the electronic growth is highly stable at room temperature and actually requires higher temperature annealing to achieve proper equilibrium. We work with the Au/MoS2 system, which shows excellent stability and can readily form discrete and atomically flat nanostructures. Here, we show how the electronic growth modes facilitate the formation of atomically flat films with nanometer scale thickness. The surface roughness of these films was found to be less than a single atom over several square microns, creating nearly perfect surfaces for studies of self-assembled monolayers or other applications.

Department

Department of Physics

Original Publication Date

8-10-2021

DOI of published version

10.1021/acs.langmuir.1c01203

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

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