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Magnetic Properties of 1D Iron–Sulfur Compounds Formed Inside Single‐Walled Carbon Nanotubes
Author(s) -
Okotrub Alexander V.,
Chernov Alexander I.,
Lavrov Alexander N.,
Gurova Olga A.,
Shubin Yury V.,
Palyanov Yuri N.,
Borzdov Yuri M.,
Zvezdin Anatoly K.,
Lähderanta Erkki,
Bulusheva Lyubov G.,
Sedelnikova Olga V.
Publication year - 2020
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202000291
Subject(s) - carbon nanotube , materials science , ferromagnetism , antiferromagnetism , nanomaterials , raman spectroscopy , sulfur , nanotechnology , nanostructure , magnetometer , magnetism , nanoparticle , optical properties of carbon nanotubes , nanotube , magnetic nanoparticles , squid , nanoscopic scale , chemical engineering , chemical physics , condensed matter physics , magnetic field , chemistry , optics , metallurgy , physics , ecology , engineering , quantum mechanics , biology
Herein, the filling of single‐walled carbon nanotubes (SWCNTs) with sulfur is performed, and the magnetic properties of the formed nanomaterials are studied. Encapsulation of sulfur species results in the appearance of a specific magnetic ordering in the system due to the formation of nanoscopic grains composed of sulfur and residual catalytic Fe nanoparticles contained in the SWCNTs. The magnetic character of the obtained 1D nanostructures is studied using superconducting quantum interference device (SQUID) magnetometer and a sequential ferromagnetic–antiferromagnetic ordering in the material is revealed. Magnetic and optical properties are strongly dependent on the synthesis protocols. A significant Raman intensity increase related to the encapsulated nanostructures is obtained when filling is performed at high‐pressure high‐temperature conditions. Simultaneously, the magnetic susceptibility gets strongly reduced for high‐pressure filling, which is related to the escape of iron particles from the nanotube interior, and the magnetic properties of the material are governed by a weak ferromagnetic ordering of Fe–S structures remained inside SWCNTs. Sulfur encapsulation provides the new route for controlling the magnetic properties in 1D nanomaterials that pave the way for advanced magneto‐optical applications.