Nanostructured nickel manganese oxide: Aligned nanostructures and their magnetic properties

Menaka; Neha Garg; Sandeep Kumar; Deepak Kumar; Kandalam V. Ramanujachary; Samuel E. Lofland; Ashok K. Ganguli

doi:10.1039/c2jm32951d

Nanostructured nickel manganese oxide: Aligned nanostructures and their magnetic properties

Menaka, Neha Garg, Sandeep Kumar, Deepak Kumar, Kandalam V. Ramanujachary, Samuel E. Lofland, Ashok K. Ganguli

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The present study describes the control of the assembly of NiMn ₂O ₄ nanospheres and hexagonal particles by tuning the precursor (nickel manganese oxalate) morphology. The aspect ratio (2 to 24) of the nickel manganese oxalate precursors has been achieved by the variation of the surfactant, co-surfactant and non-polar phase by the reverse micellar route. Slow decomposition of the oxalate precursor (aspect ratio ≥ 3) enables us to maintain the anisotropic morphology in the NiMn ₂O ₄ nanorods. However, the decomposition of the cuboid-shaped oxalate precursor (aspect ratio < 3) led to the formation of spherical nanoparticles. The ferrimagnetic transition temperature T _c (126-72 K) and magnetization decrease with the decrease in the aspect ratio of the nanorods. Hexagonal nanoparticles of NiMn ₂O ₄ show the lowest T _c (∼72 K) and magnetization.

Original language	English (US)
Pages (from-to)	18447-18453
Number of pages	7
Journal	Journal of Materials Chemistry
Volume	22
Issue number	35
DOIs	https://doi.org/10.1039/c2jm32951d
State	Published - Sep 21 2012

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Chemistry(all)
Materials Chemistry

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abstract = "The present study describes the control of the assembly of NiMn 2O 4 nanospheres and hexagonal particles by tuning the precursor (nickel manganese oxalate) morphology. The aspect ratio (2 to 24) of the nickel manganese oxalate precursors has been achieved by the variation of the surfactant, co-surfactant and non-polar phase by the reverse micellar route. Slow decomposition of the oxalate precursor (aspect ratio ≥ 3) enables us to maintain the anisotropic morphology in the NiMn 2O 4 nanorods. However, the decomposition of the cuboid-shaped oxalate precursor (aspect ratio < 3) led to the formation of spherical nanoparticles. The ferrimagnetic transition temperature T c (126-72 K) and magnetization decrease with the decrease in the aspect ratio of the nanorods. Hexagonal nanoparticles of NiMn 2O 4 show the lowest T c (∼72 K) and magnetization.",

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AU - Menaka,

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AU - Kumar, Sandeep

AU - Kumar, Deepak

AU - Ramanujachary, Kandalam V.

AU - Lofland, Samuel E.

AU - Ganguli, Ashok K.

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N2 - The present study describes the control of the assembly of NiMn 2O 4 nanospheres and hexagonal particles by tuning the precursor (nickel manganese oxalate) morphology. The aspect ratio (2 to 24) of the nickel manganese oxalate precursors has been achieved by the variation of the surfactant, co-surfactant and non-polar phase by the reverse micellar route. Slow decomposition of the oxalate precursor (aspect ratio ≥ 3) enables us to maintain the anisotropic morphology in the NiMn 2O 4 nanorods. However, the decomposition of the cuboid-shaped oxalate precursor (aspect ratio < 3) led to the formation of spherical nanoparticles. The ferrimagnetic transition temperature T c (126-72 K) and magnetization decrease with the decrease in the aspect ratio of the nanorods. Hexagonal nanoparticles of NiMn 2O 4 show the lowest T c (∼72 K) and magnetization.

AB - The present study describes the control of the assembly of NiMn 2O 4 nanospheres and hexagonal particles by tuning the precursor (nickel manganese oxalate) morphology. The aspect ratio (2 to 24) of the nickel manganese oxalate precursors has been achieved by the variation of the surfactant, co-surfactant and non-polar phase by the reverse micellar route. Slow decomposition of the oxalate precursor (aspect ratio ≥ 3) enables us to maintain the anisotropic morphology in the NiMn 2O 4 nanorods. However, the decomposition of the cuboid-shaped oxalate precursor (aspect ratio < 3) led to the formation of spherical nanoparticles. The ferrimagnetic transition temperature T c (126-72 K) and magnetization decrease with the decrease in the aspect ratio of the nanorods. Hexagonal nanoparticles of NiMn 2O 4 show the lowest T c (∼72 K) and magnetization.

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Nanostructured nickel manganese oxide: Aligned nanostructures and their magnetic properties

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