First principles study on the functionalization of graphene with Fe catalyst for the detection of CO2: Effect of catalyst clustering

Muhammad Ali, Nacir Tit, Zain Hassan Yamani

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The surface functionalization of graphene plays an important role in the development of graphene-based sensors for gas detection and removal. Here, we report the effect of decoration of graphene with Fe catalyst, as either scattered adatoms (Feadatoms@G) or clustered (Fecluster@G) on the detection of CO2 gas molecule and its influence on the structural, adsorption, electronic and magnetic properties of graphene using the spin-polarized density functional theory (DFT). The results show that the adsorption of scattered Fe-adatoms and Fe4-cluster on graphene would break the degeneracy of spin-up and spin-down states, resulting in ferromagnetic adsorption-bed for the detection of CO2 molecules. The magnetic moment of Feadatoms@G remains the same for all concentration of CO2, while the magnetic moment of Fecluster@G decreases from 10.03 µB to 4 µB by increasing the concentration of CO2 from one to four molecules. It is found that the scattered Fe-adatoms on graphene have the higher tendency to adsorb more CO2 molecules than that of the cluster with the same number of Fe atoms, whereas Fe4-cluster on graphene detects CO2 molecules using magnetism. Our results have indeed a direct application to fabricate solid-state and magnetic-based gas sensors using graphene to detect CO2 gas molecules.

Original languageEnglish
Article number144153
JournalApplied Surface Science
Volume502
DOIs
Publication statusPublished - Feb 1 2020

Keywords

  • Adsorption
  • CO gas sensor
  • Density functional theory
  • Fe catalyst
  • Graphene
  • Magnetic moment

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'First principles study on the functionalization of graphene with Fe catalyst for the detection of CO2: Effect of catalyst clustering'. Together they form a unique fingerprint.

Cite this