TY - JOUR
T1 - Probing the Defect-Induced Magnetocaloric Effect on Ferrite/Graphene Functional Nanocomposites and their Magnetic Hyperthermia
AU - Prabhakaran, T.
AU - Udayabhaskar, R.
AU - Mangalaraja, R. V.
AU - Sahlevani, Saeed Farhang
AU - Freire, Rafael M.
AU - Denardin, Juliano C.
AU - Béron, F.
AU - Varaprasad, Kokkarachedu
AU - Gracia-Pinilla, Miguel Angel
AU - Vinicius-Araújo, Marcus
AU - Bakuzis, Andris F.
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/10/24
Y1 - 2019/10/24
N2 - Recently, the development of an alternative magnetic refrigerant for the conventional fossil fuels attracts the researchers. We discussed the structural defect-induced magnetocaloric effect (MCE) in Ni0.3Zn0.7Fe2O4/graphene (NZF/G) nanocomposites for the first time. Single-phase spinel ferrite nanocomposites with an average size of 7-11.4 nm were achieved by using the microwave-assisted coprecipitation method. The effect of graphene loading on the structural and magnetism of NZF/G nanocomposites was elaborated. Raman analysis proved that the interface interaction between NZF and graphene yielded different densities of structural defects. In view of magnetism, superparamagnetic NZF nanoparticles showed a magnetic entropy change (-Î"SMmax) of-0.678 Jkg-1 K-1 at 135 K, whereas the NZF/G nanocomposites exhibited superior-Î"SMmax at cryogenic temperatures and the defect-induced MCE change was indeed similar to the ID/IG intensity ratio. The nanocomposites exhibited different magnetic orderings between 5 and 295 K, and it was varying for ID/IG, 1.83 > 1.68 > 1.57 as antiferromagnetic (AFM) > AFM/ferrimagnetic (FiM) > FiM, respectively. Till now, NZF/G nanocomposites showed an inverse MCE of 4.378 Jkg-1 K-1 at 35 K and a refrigerant capacity of 88 Jkg-1 for 40 kOe, which was greater than the ferrites reported so far. Finally, MCE and magnetic hyperthermia were correlated at ambient conditions. These results pave the way for ferrite/graphene nanocomposites for cooling applications.
AB - Recently, the development of an alternative magnetic refrigerant for the conventional fossil fuels attracts the researchers. We discussed the structural defect-induced magnetocaloric effect (MCE) in Ni0.3Zn0.7Fe2O4/graphene (NZF/G) nanocomposites for the first time. Single-phase spinel ferrite nanocomposites with an average size of 7-11.4 nm were achieved by using the microwave-assisted coprecipitation method. The effect of graphene loading on the structural and magnetism of NZF/G nanocomposites was elaborated. Raman analysis proved that the interface interaction between NZF and graphene yielded different densities of structural defects. In view of magnetism, superparamagnetic NZF nanoparticles showed a magnetic entropy change (-Î"SMmax) of-0.678 Jkg-1 K-1 at 135 K, whereas the NZF/G nanocomposites exhibited superior-Î"SMmax at cryogenic temperatures and the defect-induced MCE change was indeed similar to the ID/IG intensity ratio. The nanocomposites exhibited different magnetic orderings between 5 and 295 K, and it was varying for ID/IG, 1.83 > 1.68 > 1.57 as antiferromagnetic (AFM) > AFM/ferrimagnetic (FiM) > FiM, respectively. Till now, NZF/G nanocomposites showed an inverse MCE of 4.378 Jkg-1 K-1 at 35 K and a refrigerant capacity of 88 Jkg-1 for 40 kOe, which was greater than the ferrites reported so far. Finally, MCE and magnetic hyperthermia were correlated at ambient conditions. These results pave the way for ferrite/graphene nanocomposites for cooling applications.
UR - http://www.scopus.com/inward/record.url?scp=85073453711&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.9b07076
DO - 10.1021/acs.jpcc.9b07076
M3 - Article
AN - SCOPUS:85073453711
SN - 1932-7447
VL - 123
SP - 25844
EP - 25855
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 42
ER -