Morphology-Dependent Magnetism in Nanographene: Beyond Nanoribbons

Jiří Tuček, Piotr Błoński, Ondřej Malina, Martin Pumera, Chun Kiang Chua, Michal Otyepka, Radek Zbořil

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Imprinting self-sustainable magnetic features into graphene has recently generated much interest owing to its potential application in spintronics. Several strategies for imprinting magnetic features into graphene are proposed theoretically. However, only a few of them are realized experimentally. Here, the first scalable synthesis of magnetic graphene nanoplatelets with diverse morphologies, including nanoribbons and triangular, pentagonal, hexagonal, and other polyhedral shapes, is reported. This material enters the ferromagnetic regime at a temperature of ≈37 K with magnetization approaching ≈0.45 emu g−1 under high external magnetic fields. Theoretical calculations are used to explain this sort of morphology-driven magnetism of graphene nanoplatelets, which emerges from the synergistic effects of the size, geometry of nanographenes, edge terminations, and angle between adjacent edges. In addition, they suggest a new way for preparing magnetically ordered graphene nanoplatelets with a higher transition temperature. In this respect, triangular motifs with zigzag edges represent the most promising morphology of graphene nanoplatelets, which can remain magnetically ordered up to ≈107 K. Based on these challenging results, further tuning of the size and morphology in spatially confined nanographenes combined with doping and sp3 functionalization will enable the preparation of magnetically ordered half-metallic carbon sustainable up to room temperature, thus opening new opportunities in spintronics.

Original languageEnglish
Article number1800592
JournalAdvanced Functional Materials
Volume28
Issue number22
DOIs
Publication statusPublished - 2018 May 30

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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    Tuček, J., Błoński, P., Malina, O., Pumera, M., Chua, C. K., Otyepka, M., & Zbořil, R. (2018). Morphology-Dependent Magnetism in Nanographene: Beyond Nanoribbons. Advanced Functional Materials, 28(22), [1800592]. https://doi.org/10.1002/adfm.201800592