Previous studies have been conducted on silver halide monolayers on Au(111) surfaces using Electrochemical Scanning Tunneling Microscopy (EC-STM). The Ag thin films were deposited using Underpotential Deposition (UPD), a technique where an atomic monolayer is formed on a metallic surface by applying an underpotential when the surface is in a solution containing metal ions. In this research, UPD was used to apply a Ag monolayer from a silver chloride solution to Au(111) in two different potential regions. The presence of a Ag thin film was verified using Cyclic Voltammetry (CV) to confirm a change in the surface chemistry. The surface was also scanned using EC-STM to further verify the presence of silver on the surface. A notable result was that the silver monolayer was thermally stable up to 1,000 K when deposited in only one of the potential regions, as a result of two different Ag deposition mechanisms. Furthermore, the assembly of amino acids on Au(111) surfaces has been studied using EC-STM. In this work, it was observed that the amino acids immbolized the free-roaming Au adatoms that exist as a 2D gas on the surface into adatom islands. This surface interaction could also be used to investigate the chemical stability of the previously studied Ag thin films. Preliminary results suggest that neither deposition potential results in a chemically stable Ag thin film in the presence of amino acids. Studying this interaction can lead to a better understanding of thin film growth modes, which has many applications from fundamental considerations to the creation of improved biosensors.

Amino acids on a silver halide monolayer on a Au(111) surface

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.