Simple synthesis, structural and optical properties of cobalt ferrite nanoparticles

. Cobalt ferrite (CoFe 2 O 4 ) nanoparticles have been successfully synthesised by simple and economic co-precipitation method at 90 ° C for 2h using a biodegradable surfactant (starch), and by annealing at 500 ° C for 1, 2, and 6h. The XRD patterns reveal spinel CoFe 2 O 4 phase for as-synthesized...

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Bibliographic Details
Published in:European physical journal plus 2019-06, Vol.134 (6), p.296, Article 296
Main Authors: Ravindra, A. V., Chandrika, M., Rajesh, Ch, Kollu, Pratap, Ju, Shaohua, Ramarao, S. D.
Format: Article
Language:English
Subjects:
Absorption spectra
Applied and Technical Physics
Atomic
Biodegradation
Blue shift
Cobalt
Cobalt ferrites
Complex Systems
Condensed Matter Physics
Current carriers
Defect annealing
Doppler effect
Energy gap
Mathematical and Computational Physics
Molecular
Nanoparticles
Optical and Plasma Physics
Optical properties
Particle size
Physics
Physics and Astronomy
Red shift
Regular Article
Starch
Surfactants
Theoretical
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Summary:. Cobalt ferrite (CoFe 2 O 4 ) nanoparticles have been successfully synthesised by simple and economic co-precipitation method at 90 ° C for 2h using a biodegradable surfactant (starch), and by annealing at 500 ° C for 1, 2, and 6h. The XRD patterns reveal spinel CoFe 2 O 4 phase for as-synthesized and annealed samples without any impurity phase. FTIR spectra also demonstrate the characteristic absorption bands of CoFe 2 O 4 phase and starch surfactant. SEM images display nearly spherical morphology for all the samples and the average particle size increases when annealed at 500 ° C and for prolonged durations at the same temperature. The direct band gap of CoFe 2 O 4 nanoparticles decreases with increasing particle size and the direct band gap values are attributed to spin-allowed d to d on-site transitions. The PL spectra exhibit peaks associated with transitions of charge carriers to near edge, surface, and defect states. The PLE peaks suffer blue shift when annealed at 500 ° C for 1h and then red shift on further prolonging the annealing time to 2 and 6h at the same temperature. Such results offer new opportunities for optimizing and enhancing the performance of cobalt ferrite where the optical properties are decisive.
ISSN:2190-5444
2190-5444
DOI:10.1140/epjp/i2019-12690-2