Electrically Controlled Adsorption of Oxygen in Bilayer Graphene Devices

TL;DR

This study explores how electric fields influence oxygen molecule adsorption on bilayer graphene, revealing electrochemical interactions and the impact on electronic properties relevant for sensor applications.

Contribution

It demonstrates that gate electric fields can modulate oxygen adsorption rates and charge transfer kinetics on bilayer graphene, highlighting electrochemical control mechanisms.

Findings

Fermi level manipulation affects adsorption rate

Charge transfer is electrochemical in nature

Adsorption influences carrier scattering in BLG

Abstract

We investigate the chemisorptions of oxygen molecules on bilayer graphene (BLG) and its electrically modified charge-doping effect using conductivity measurement of the field effect transistor channeled with BLG. We demonstrate that the change of the Fermi level by manipulating the gate electric field significantly affects not only the rate of molecular adsorption but also the carrier-scattering strength of adsorbed molecules. Exploration of the charge transfer kinetics reveals the electrochemical nature of the oxygen adsorption on BLG. [This document is the unedited Author's version of a Submitted Work that was subsequently accepted for publication in Nano Letters, {\copyright} American Chemical Society after peer review. To access the final edited and published work see http://dx.doi.org/10.1021/nl202002p.]