Sulfur Doping Induces Strong Ferromagnetic Ordering in Graphene: Effect of Concentration and Substitution Mechanism

Jiří Tuček, Piotr Błoński, Zdeněk Sofer, Petr Šimek, Martin Petr, Martin Pumera, Michal Otyepka, Radek Zbořil

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

An experiment has shown that sulfur doping in graphene induces paramagnetic centers with localized spins in the graphene lattice. These spin-carrying centers behave independently of each other if the concentration of substituting sulfur is below the threshold level. Once the doping threshold is overcome, magnetic interactions mediated by the π-electron system evolve between the substitution-generated paramagnetic centers, establishing a ferromagnetic state with a Curie temperature. The emergence of the ferromagnetic state at low temperatures was theoretically confirmed by computational study identifying magnetically active configurations. The superior magnetic properties of the S-doped graphenes over the N-doped analogs can be explained in terms of injection of two unpaired electrons by each sulfur atom to the conducting band; these electrons are delocalized among the S and C atoms contrary to those injected by N-doping that are dominantly localized at the N sites. The pumping of electrons from substitutional sulfur to the graphene conduction band is also believed to promote the sustainability of the magnetism at relatively high temperatures. Finally, the magnetically ordered S-doped graphenes with a prominent saturation magnetization and coercivity offer viable highly conductive materials, which, if further functionalized, would display strengthened self-sustainable magnetism against thermal fluctuations with a huge potential in spintronics and other magnetic applications.

Original languageEnglish
Pages (from-to)5045-5053
Number of pages9
JournalAdvanced Materials
Volume28
Issue number25
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Graphite
Sulfur
Graphene
Substitution reactions
Doping (additives)
Electrons
Magnetism
Conductive materials
Atoms
Magnetoelectronics
Saturation magnetization
Curie temperature
Coercive force
Conduction bands
Sustainable development
Magnetic properties
Temperature
Experiments

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Tuček, Jiří ; Błoński, Piotr ; Sofer, Zdeněk ; Šimek, Petr ; Petr, Martin ; Pumera, Martin ; Otyepka, Michal ; Zbořil, Radek. / Sulfur Doping Induces Strong Ferromagnetic Ordering in Graphene : Effect of Concentration and Substitution Mechanism. In: Advanced Materials. 2016 ; Vol. 28, No. 25. pp. 5045-5053.
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Tuček, J, Błoński, P, Sofer, Z, Šimek, P, Petr, M, Pumera, M, Otyepka, M & Zbořil, R 2016, 'Sulfur Doping Induces Strong Ferromagnetic Ordering in Graphene: Effect of Concentration and Substitution Mechanism', Advanced Materials, vol. 28, no. 25, pp. 5045-5053. https://doi.org/10.1002/adma.201600939

Sulfur Doping Induces Strong Ferromagnetic Ordering in Graphene : Effect of Concentration and Substitution Mechanism. / Tuček, Jiří; Błoński, Piotr; Sofer, Zdeněk; Šimek, Petr; Petr, Martin; Pumera, Martin; Otyepka, Michal; Zbořil, Radek.

In: Advanced Materials, Vol. 28, No. 25, 01.01.2016, p. 5045-5053.

Research output: Contribution to journalArticle

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