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Unilamellar nanosheet of layered manganese cobalt nickel oxide and its heterolayered film with polycations

Title
Unilamellar nanosheet of layered manganese cobalt nickel oxide and its heterolayered film with polycations
Authors
Oh E.-J.Kim T.W.Lee K.M.Song M.-S.Jee A.-Y.Lim S.T.Ha H.-W.Lee M.Choy J.-H.Hwang S.-J.
Ewha Authors
이민영최진호황성주
SCOPUS Author ID
이민영scopus; 최진호scopus; 황성주scopus
Issue Date
2010
Journal Title
ACS Nano
ISSN
1936-0851JCR Link
Citation
vol. 4, no. 8, pp. 4437 - 4444
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The exfoliation of layered Li[Mn1/3Co1/3Ni 1/3]02 into individual monolayers could be achieved through the intercalation of quaternary tetramethylammonium (TMA+) ions into protonated metal oxide. An effective exfoliation occurred when the TMA+/H+ ratio was 0.5-50. Reactions outside this range produced no colloidal suspension, but all the manganese cobalt nickel oxides precipitated. Atomic force microscopy and transmission electron microscopy clearly demonstrated that exfoliated manganese cobalt nickel oxide nanosheets have a nanometer - level thickness, underscoring the formation of unilamellar nanosheets. The maintenance of the hexagonal atomic arrangement of the manganese cobalt nickel oxide layer upon the exfoliation was confirmed by selected area electron diffraction analysis. According to diffuse reflectance ultraviolet-visible spectroscopy, the exfoliated manganese cobalt nickel oxides displayed distinct absorption peaks at ∼ 354 and ∼ 480 nm corresponding to the d-d transitions of octahedral metal ions, which contrasted with the featureless spectrum of the pristine metal oxide. In the light of zeta potential data showing the negative surface charge of manganese cobalt nickel oxide nanosheets, a heterolayered film of manganese cobalt nickel oxide and conductive polymers could be prepared through the successive coating process with colloidal suspension and polycations. The UV-vis and X-ray diffraction studies verified the layer-by-layer ordered structure of the obtained heterolayered film, respectively. © 2010 American Chemical Society.
DOI
10.1021/nn100286u
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자연과학대학 > 화학·나노과학전공 > Journal papers
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