Adsorption/desorption and electrically controlled flipping of ammonia molecules on graphene

TL;DR

This study investigates ammonia molecule interactions with graphene, focusing on adsorption/desorption dynamics and electric field-induced flipping behavior, providing insights into surface chemistry and potential sensor applications.

Contribution

It introduces a model to quantify ammonia adsorption/desorption rates from Fermi level shifts and reveals electric field-controlled flipping of molecules on graphene.

Findings

Adsorption/desorption rates derived from Fermi level shifts.

Electric field induces flipping of ammonia molecules.

FET measurements support flipping behavior.

Abstract

In this paper, we evaluate of the adsorption/ desorption of ammonia molecules on a graphene surface by studying the Fermi level shift. Based on a physically plausible model, the adsorption and desorption rates of ammonia molecules on graphene have been extracted from the measured Fermi level shift as a function of exposure time. An electric field-induced flipping behavior of ammonia molecules on graphene is suggested, based on field effect transistor (FET) measurements.