Synthesis and magnetic property of cobalt hydroxide carbonate and cobalt oxide nanowires

The present study is the first to report the successful synthesis of layered cobalt hydroxide carbonate nanowires templated by dodecyl sulfate assemblies by a homogeneous precipitation method using urea. The layered structure was composed of a cobalt hydroxide carbonate phase 1.9 nm thick and a dode...

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Bibliographic Details
Published in:CrystEngComm 2012-01, Vol.14 (21), p.7374-7381
Main Authors: Yada, Mitsunori, Inoue, Yuko, Koikawa, Masayuki, Torikai, Toshio, Watari, Takanori
Format: Article
Language:English
Subjects:
Carbonates
Cobalt
Cobalt compounds
Ferrimagnetism
Hydroxides
Nanorods
Nanowires
Sulfates
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Summary:The present study is the first to report the successful synthesis of layered cobalt hydroxide carbonate nanowires templated by dodecyl sulfate assemblies by a homogeneous precipitation method using urea. The layered structure was composed of a cobalt hydroxide carbonate phase 1.9 nm thick and a dodecyl sulfate phase 2.3 nm thick. The width and length of the nanowires were tens of nm and greater than several micrometers, respectively. The layered cobalt hydroxide carbonate nanowires were transformed into Co sub(3)O sub(4) and CoO nanowires by calcination in air and in vacuum, respectively, and were exfoliated to form ultrathin cobalt hydroxide carbonate nanowires approximately 3 nm wide. The present study also showed a dependence of the size and morphology on the magnetism of cobalt hydroxide carbonate. Although cobalt hydroxide carbonate nanorods synthesized in the presence of Na sub(2)SO sub(4).10H sub(2)O and lamellar-shaped cobalt compound templated by a mixture of C sub(16)H sub(33)OSO sub(3 ) super(-) and C sub(18)H sub(37)OSO sub(3 ) super(-) were antiferromagnetic materials, the layered cobalt hydroxide carbonate nanowires exhibited ferrimagnetism. This expression of ferrimagnetism was considered to be due to the formation of ultrathin cobalt hydroxide carbonate phases in the nanowires. Moreover, the Neel temperature of the obtained Co sub(3)O sub(4) nanowires, which exhibited antiferromagnetism, was lower than that of commercially available Co sub(3)O sub(4) particles.
ISSN:1466-8033
1466-8033
DOI:10.1039/c2ce25557j