Magnetic properties of carbon nanocages: Pure and with the Ni or Co inclusions

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2025-02-13 DOI:10.1016/j.solidstatesciences.2025.107862

K.B. Tsiberkin , A.V. Sosunov , V.V. Govorina , D.S. Neznakhin , V.K. Henner , G. Sumanasekera

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Abstract

Carbon nanocages (CNCs) are promising materials for catalysis, filtration and electrochemistry. This work is devoted to the experimental and theoretical study of the magnetic properties of both pure CNCs and those encapsulated by transition metals Ni and Co. This study presents high-resolution transmission electron microscopy (HR-TEM) images of the homogeneous composite consisting of Co particles with a diameter of 3–5 nm coated with one or more layers of graphitized carbon. We also present HR-TEM images of hollow nanocages obtained after the complete etching of the metal with acid. The coercivity of the homogeneous composites (Ni and Co encapsulated) exhibited a rapid decrease below 50 K, while in the temperature range of 50–350 K, pronounced superparamagnetic properties are observed. On the other hand, in the etched material consisting of hollow carbon cages, the contribution of the diamagnetism of the carbon fraction increases with temperature. Theoretical estimates of saturation magnetization of metal nanoparticles and the electronic diamagnetic susceptibility of the carbon spheres are consistent with the experimental results.

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.