Various synthesis methods for the preparation of well-crystalline and monodisperse cobalt ferrite nanocrystals

Chin Hua Chia, Sarani Zakaria, PoiSim S. Khiew, WeeSiong S. Chiu, Mustaffa Hj Abdullah

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Nano-sized transition metal oxides with spinel structure have recently received wideattention in several scientific and technological fields. Among the transition metal ferritecobalt ferrite (CoFe2O4) has been extensively studied due to its high coercivity, moderatesaturation magnetization, large magnetostrictive coefficient, remarkable mechanicalhardness and superior chemical stability. Many studies have reported on the utilization ofCoFe2O4 nanocrystals in various applications, such as lithium ion batteries, magneticcatalysis, sensors and actuators, hyperthermia treatment, and antitumor applications. Thecommon methods reported for the synthesis of CoFe2O4 nanocrystals are chemical coprecipitation,hydrothermal, thermal decomposition, microemulsion, etc. It is found thatthe synthesis temperature during the formation and growth of the crystals plays animportant role in obtaining monodisperse CoFe2O4 nanocrystals with high saturationmagnetization and coercivity. Further calcination of the as-synthesized CoFe2O4nanocrystals or precursors can be carried out to improve the degree of crystallinity andmagnetic properties of the CoFe2O4 nanocrystals. However, improper control of the calcination parameters will result in aggregation of the nanocrystals, leading to the decrease of coercivity of the CoFe2O4 nanocrystals. Studies also found that the particle shape will strongly influence the saturation magnetization and coercivity of the CoFe2O4 nanocrystals due to the increase of surface anisotropy of the nanocrystals. This can be achieved by preparing the nanocrystals under an external magnetic field or using template and capping agent.

Original languageEnglish
Title of host publicationCobalt: Characteristics, Compounds and Applications
PublisherNova Science Publishers, Inc.
Pages275-290
Number of pages16
ISBN (Print)9781613241035
Publication statusPublished - Mar 2011

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Nanocrystals
Crystalline materials
Coercive force
Calcination
Transition metals
cobalt ferrite
Chemical stability
Microemulsions
Saturation magnetization
Coprecipitation
Crystallization
Oxides
Ferrite
Magnetization
Anisotropy
Pyrolysis
Actuators
Agglomeration
Magnetic fields
Sensors

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Chia, C. H., Zakaria, S., Khiew, P. S., Chiu, W. S., & Abdullah, M. H. (2011). Various synthesis methods for the preparation of well-crystalline and monodisperse cobalt ferrite nanocrystals. In Cobalt: Characteristics, Compounds and Applications (pp. 275-290). Nova Science Publishers, Inc..

Various synthesis methods for the preparation of well-crystalline and monodisperse cobalt ferrite nanocrystals. / Chia, Chin Hua; Zakaria, Sarani; Khiew, PoiSim S.; Chiu, WeeSiong S.; Abdullah, Mustaffa Hj.

Cobalt: Characteristics, Compounds and Applications. Nova Science Publishers, Inc., 2011. p. 275-290.

Research output: Chapter in Book/Report/Conference proceedingChapter

Chia, CH, Zakaria, S, Khiew, PS, Chiu, WS & Abdullah, MH 2011, Various synthesis methods for the preparation of well-crystalline and monodisperse cobalt ferrite nanocrystals. in Cobalt: Characteristics, Compounds and Applications. Nova Science Publishers, Inc., pp. 275-290.
Chia CH, Zakaria S, Khiew PS, Chiu WS, Abdullah MH. Various synthesis methods for the preparation of well-crystalline and monodisperse cobalt ferrite nanocrystals. In Cobalt: Characteristics, Compounds and Applications. Nova Science Publishers, Inc. 2011. p. 275-290
Chia, Chin Hua ; Zakaria, Sarani ; Khiew, PoiSim S. ; Chiu, WeeSiong S. ; Abdullah, Mustaffa Hj. / Various synthesis methods for the preparation of well-crystalline and monodisperse cobalt ferrite nanocrystals. Cobalt: Characteristics, Compounds and Applications. Nova Science Publishers, Inc., 2011. pp. 275-290
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