Room temperature organic magnets derived from sp3 functionalized graphene

Jiří Tuček, Kateřina Holá, Athanasios B. Bourlinos, Piotr Błoński, Aristides Bakandritsos, Juri Ugolotti, Matúš Dubecký, František Karlický, Václav Ranc, Klára Čépe, Michal Otyepka and Radek Zbořil ()
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Jiří Tuček: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Kateřina Holá: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Athanasios B. Bourlinos: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Piotr Błoński: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Aristides Bakandritsos: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Juri Ugolotti: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Matúš Dubecký: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
František Karlický: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Václav Ranc: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Klára Čépe: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Michal Otyepka: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc
Radek Zbořil: Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc

Nature Communications, 2017, vol. 8, issue 1, 1-12

Abstract: Abstract Materials based on metallic elements that have d orbitals and exhibit room temperature magnetism have been known for centuries and applied in a huge range of technologies. Development of room temperature carbon magnets containing exclusively sp orbitals is viewed as great challenge in chemistry, physics, spintronics and materials science. Here we describe a series of room temperature organic magnets prepared by a simple and controllable route based on the substitution of fluorine atoms in fluorographene with hydroxyl groups. Depending on the chemical composition (an F/OH ratio) and sp3 coverage, these new graphene derivatives show room temperature antiferromagnetic ordering, which has never been observed for any sp-based materials. Such 2D magnets undergo a transition to a ferromagnetic state at low temperatures, showing an extraordinarily high magnetic moment. The developed theoretical model addresses the origin of the room temperature magnetism in terms of sp2-conjugated diradical motifs embedded in an sp3 matrix and superexchange interactions via –OH functionalization.

Date: 2017
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DOI: 10.1038/ncomms14525

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