TY - JOUR

T1 - Magnetic Properties of 1D Iron–Sulfur Compounds Formed Inside Single-Walled Carbon Nanotubes

AU - Okotrub, Alexander V.

AU - Chernov, Alexander I.

AU - Lavrov, Alexander N.

AU - Gurova, Olga A.

AU - Shubin, Yury V.

AU - Palyanov, Yuri N.

AU - Borzdov, Yuri M.

AU - Zvezdin, Anatoly K.

AU - Lähderanta, Erkki

AU - Bulusheva, Lyubov G.

AU - Sedelnikova, Olga V.

N1 - Publisher Copyright: © 2020 Wiley-VCH GmbH

PY - 2020/10/1

Y1 - 2020/10/1

N2 - 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.

AB - 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.

KW - antiferromagnetism

KW - single-walled carbon nanotube encapsulation

KW - single-walled carbon nanotubes

KW - sulfur compounds

KW - SYSTEM

KW - PYRITE FES2

KW - ENERGY

KW - ENCAPSULATION

KW - SIZE

KW - GRAPHENE NANORIBBON

KW - IMPACT

KW - ENHANCEMENT

KW - GROWTH

UR - http://www.scopus.com/inward/record.url?scp=85089595770&partnerID=8YFLogxK

U2 - 10.1002/pssr.202000291

DO - 10.1002/pssr.202000291

M3 - Article

AN - SCOPUS:85089595770

VL - 14

JO - Physica Status Solidi - Rapid Research Letters

JF - Physica Status Solidi - Rapid Research Letters

SN - 1862-6254

IS - 10

M1 - 2000291

ER -