Zigzag sp<sub>2</sub> Carbon Chains Passing through an sp<sub>3</sub> Framework

Author(s)
Jiří Tuček, Kateřina Holá, Giorgio Zoppellaro, Piotr Bloński, Rostislav Langer, Miroslav Medved, Toma Susi, Michal Otyepka, Radek Zbořil
Abstract

Stabilization of ferromagnetic ordering in graphene-based systems up to room temperature remains an important challenge owing to the huge scope for applications in electronics, spintronics, biomedicine, and separation technologies. To date, several strategies have been proposed, including edge engineering, introduction of defects and dopants, and covalent functionalization. However, these techniques are usually hampered by limited temperature sustainability of ferromagnetic ordering. Here, we describe a method for the well-controlled sp3 functionalization of graphene to synthesize zigzag conjugated sp2 carbon chains that can act as communication pathways among radical motifs. Zigzag sp2/sp3 patterns in the basal plane were clearly observed by high-resolution scanning transmission electron microscopy and provided a suitable matrix for stabilization of ferromagnetic ordering up to room temperature due to combined contributions of itinerant π-electrons and superexchange interactions. The results highlight the principal role of sp2/sp3 ratio and superorganization of radical motifs in graphene for generating room-temperature nonmetallic magnets.

Organisation(s)
Physics of Nanostructured Materials
Journal
ACS Nano
Volume
12
Pages
12847–12859
No. of pages
12
ISSN
1936-0851
Publication date
12-2018
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103017 Magnetism, 104011 Materials chemistry, 103042 Electron microscopy, 210004 Nanomaterials
Keywords
2D magnets, density of states, DFT calculations, fluorographene, hydroxofluorographene, hydroxyl, magnetic carbon, spintronics
ASJC Scopus subject areas
Materials Science(all), Engineering(all), Physics and Astronomy(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/zigzag-sp2-carbon-chains-passing-through-an-sp3-framework(d99b3ce9-df7e-4a15-a836-ec3dcac6cc26).html