Magnetocaloric effect in reduced graphene oxide

• Published in: Journal of magnetism and magnetic materials Vol. 476; pp. 604 - 607
• Main Authors: Korolev, V.V., Ramazanova, A.G., Balmasova, O.V., Soloveva, A.Yu, Buslaeva, E.Yu, Gubin, S.P., Gruzdev, M.S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.04.2019; Elsevier BV
• Subjects: Defects in graphene; Dependence; Flakes (defects); Graphene; Magnetic induction; Magnetocaloric effect; Specific heat capacity; Surface defects; Defects in graphene; Graphene; Magnetocaloric effect; Specific heat capacity
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2018.12.066

•Two samples of reduced graphene oxide with different degrees of defectiveness.•Magnetocaloric effect of graphene has experimentally obtained in the room temperatures.•Degree of graphene defectiveness act on the heat capacity and magnetocaloric effect. The magnetocaloric effect (MCE) in multiplayer graphene flakes was for the first time detected at deferent temperatures. When the magnetic field induction varied from 0 to 1.0 T, the MCE was positive. The MCE field dependence has a linear character. At 298 K, the MCE is equal to 0.01 K. Graphene samples prepared in different manner were characterized by different degree of structural imperfection. It was established that the MCE increases as the content of surface defects in graphene increases. Graphene samples obtained by different methods and having different degree of structural imperfection have different heat capacities.