Wet chemical synthesis and magnetic properties of core-shell nanocolumns of Ni(OH)2@Co(OH)2 and their oxides

Meng Yao; Weimeng Chen; Xia Fan; Chenmin Liu; Xiangmin Meng; Lin Guo; Chinping Chen

doi:10.1039/c0ce00836b

Wet chemical synthesis and magnetic properties of core-shell nanocolumns of Ni(OH)₂@Co(OH)₂ and their oxides

Meng Yao
, Weimeng Chen
, Xia Fan
, Chenmin Liu
, Xiangmin Meng
, Lin Guo^*
, Chinping Chen

^*Corresponding author for this work

School of Chemistry

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

17 Scopus citations

Abstract

Ni(OH)₂@Co(OH)₂ core-shell nanocolumns have been synthesized by an easy wet chemical process. Characterizations reveal that the layer structure is formed by stacking of several hexagonal nanosheets along the [001] direction. Each sheet is found to be of good crystallinity according to high-resolution transmission electron microscopy, with Ni(OH)₂ in the central and Co(OH)₂ in the peripheral region. The diagonal length of the hexagon is about 700-900 nm and the height of the nanocolumn is about 140-200 nm, with each nanosheet of about 20 nm in thickness. Upon calcination, the Ni(OH)₂@Co(OH)₂ nanocolumns become a porous NiO@Co₃O₄ nanostructure. At low temperature, Ni(OH) ₂@Co(OH)₂ exhibits an antiferromagnetic (AFM) transition at T_N = 12 K. This is from Co(OH)₂ while the AFM transition of Ni(OH)₂, expected at 25 K, is not observed. A freezing temperature is also observed at T_F = 7.5 K most likely arising from the randomly oriented moments in the outermost surface of Co(OH)₂. After the calcination, the AFM transition of Co₃O₄ in the porous NiO@Co₃O₄ nanostructure is observed at 28 K, which is much reduced from the bulk value of T_N = 40 K, probably arising from the finite size effect. The characteristic dimension with the porosity is thus determined as about 8 nm.

Original language	English
Pages (from-to)	2593-2598
Number of pages	6
Journal	CrystEngComm
Volume	13
Issue number	7
DOIs	https://doi.org/10.1039/c0ce00836b
State	Published - 7 Apr 2011

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title = "Wet chemical synthesis and magnetic properties of core-shell nanocolumns of Ni(OH)2@Co(OH)2 and their oxides",

abstract = "Ni(OH)2@Co(OH)2 core-shell nanocolumns have been synthesized by an easy wet chemical process. Characterizations reveal that the layer structure is formed by stacking of several hexagonal nanosheets along the [001] direction. Each sheet is found to be of good crystallinity according to high-resolution transmission electron microscopy, with Ni(OH)2 in the central and Co(OH)2 in the peripheral region. The diagonal length of the hexagon is about 700-900 nm and the height of the nanocolumn is about 140-200 nm, with each nanosheet of about 20 nm in thickness. Upon calcination, the Ni(OH)2@Co(OH)2 nanocolumns become a porous NiO@Co3O4 nanostructure. At low temperature, Ni(OH) 2@Co(OH)2 exhibits an antiferromagnetic (AFM) transition at TN = 12 K. This is from Co(OH)2 while the AFM transition of Ni(OH)2, expected at 25 K, is not observed. A freezing temperature is also observed at TF = 7.5 K most likely arising from the randomly oriented moments in the outermost surface of Co(OH)2. After the calcination, the AFM transition of Co3O4 in the porous NiO@Co3O4 nanostructure is observed at 28 K, which is much reduced from the bulk value of TN = 40 K, probably arising from the finite size effect. The characteristic dimension with the porosity is thus determined as about 8 nm.",

author = "Meng Yao and Weimeng Chen and Xia Fan and Chenmin Liu and Xiangmin Meng and Lin Guo and Chinping Chen",

year = "2011",

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T1 - Wet chemical synthesis and magnetic properties of core-shell nanocolumns of Ni(OH)2@Co(OH)2 and their oxides

AU - Yao, Meng

AU - Chen, Weimeng

AU - Fan, Xia

AU - Liu, Chenmin

AU - Meng, Xiangmin

AU - Guo, Lin

AU - Chen, Chinping

PY - 2011/4/7

Y1 - 2011/4/7

N2 - Ni(OH)2@Co(OH)2 core-shell nanocolumns have been synthesized by an easy wet chemical process. Characterizations reveal that the layer structure is formed by stacking of several hexagonal nanosheets along the [001] direction. Each sheet is found to be of good crystallinity according to high-resolution transmission electron microscopy, with Ni(OH)2 in the central and Co(OH)2 in the peripheral region. The diagonal length of the hexagon is about 700-900 nm and the height of the nanocolumn is about 140-200 nm, with each nanosheet of about 20 nm in thickness. Upon calcination, the Ni(OH)2@Co(OH)2 nanocolumns become a porous NiO@Co3O4 nanostructure. At low temperature, Ni(OH) 2@Co(OH)2 exhibits an antiferromagnetic (AFM) transition at TN = 12 K. This is from Co(OH)2 while the AFM transition of Ni(OH)2, expected at 25 K, is not observed. A freezing temperature is also observed at TF = 7.5 K most likely arising from the randomly oriented moments in the outermost surface of Co(OH)2. After the calcination, the AFM transition of Co3O4 in the porous NiO@Co3O4 nanostructure is observed at 28 K, which is much reduced from the bulk value of TN = 40 K, probably arising from the finite size effect. The characteristic dimension with the porosity is thus determined as about 8 nm.

AB - Ni(OH)2@Co(OH)2 core-shell nanocolumns have been synthesized by an easy wet chemical process. Characterizations reveal that the layer structure is formed by stacking of several hexagonal nanosheets along the [001] direction. Each sheet is found to be of good crystallinity according to high-resolution transmission electron microscopy, with Ni(OH)2 in the central and Co(OH)2 in the peripheral region. The diagonal length of the hexagon is about 700-900 nm and the height of the nanocolumn is about 140-200 nm, with each nanosheet of about 20 nm in thickness. Upon calcination, the Ni(OH)2@Co(OH)2 nanocolumns become a porous NiO@Co3O4 nanostructure. At low temperature, Ni(OH) 2@Co(OH)2 exhibits an antiferromagnetic (AFM) transition at TN = 12 K. This is from Co(OH)2 while the AFM transition of Ni(OH)2, expected at 25 K, is not observed. A freezing temperature is also observed at TF = 7.5 K most likely arising from the randomly oriented moments in the outermost surface of Co(OH)2. After the calcination, the AFM transition of Co3O4 in the porous NiO@Co3O4 nanostructure is observed at 28 K, which is much reduced from the bulk value of TN = 40 K, probably arising from the finite size effect. The characteristic dimension with the porosity is thus determined as about 8 nm.

UR - https://www.scopus.com/pages/publications/79952855935

U2 - 10.1039/c0ce00836b

DO - 10.1039/c0ce00836b

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SN - 1466-8033

VL - 13

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JO - CrystEngComm

JF - CrystEngComm

IS - 7

ER -

Wet chemical synthesis and magnetic properties of core-shell nanocolumns of Ni(OH)₂@Co(OH)₂ and their oxides

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