Inorganic multilayer films of manganese oxide nanosheets and aluminum polyoxocations: Fabrication, structure, and electrochemical behavior

Wang, Lianzhou, Sakai, Nobuyuki, Ebina, Yasuo, Takada, Kazunori and Sasaki, Takayoshi (2005) Inorganic multilayer films of manganese oxide nanosheets and aluminum polyoxocations: Fabrication, structure, and electrochemical behavior. Chemistry of Materials, 17 6: 1352-1357. doi:10.1021/cm048146a

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Author Wang, Lianzhou
Sakai, Nobuyuki
Ebina, Yasuo
Takada, Kazunori
Sasaki, Takayoshi
Title Inorganic multilayer films of manganese oxide nanosheets and aluminum polyoxocations: Fabrication, structure, and electrochemical behavior
Journal name Chemistry of Materials   Check publisher's open access policy
ISSN 0897-4756
1520-5002
Publication date 2005-03-22
Sub-type Article (original research)
DOI 10.1021/cm048146a
Volume 17
Issue 6
Start page 1352
End page 1357
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Inorganic multilayer films of exfoliated MnO2 nanosheets and aluminum Keggin ions have been fabricated onto various substrates via sequential adsorption. Ultraviolet-visible absorption spectra in the multilayer buildup process indicated that nearly equal amounts of nanosheets could be assembled for each deposition cycle. X-ray photoelectron spectroscopic quantitative analysis and structural consideration based on charge balance indicate that aluminum Keggin ions should be sparsely distributed in the nanosheet galleries, occupying only 13% of the gallery area. This low density of Keggin ions can explain a Bragg peak observed with a relatively small periodicity of 0.73 nm, suggesting that a major gallery area accommodates H2O molecules. This unique structure is different from ordinary multilayer structures, in which two components alternate, contributing to the film thickness with their own sizes. The multilayer film showed a very stable cyclic voltammogram involving reversible redox reactions of Mn-III/Mn-IV, providing new potential electrodes for electrochemical applications. The observed electron transfer suggests that a predominant amount of MnO2 nanosheets in multilayer films was electrochemically active.
Keyword Chemistry, Physical
Materials Science, Multidisciplinary
Exfoliated Mno2 Nanosheets
Thin-films
Ultrathin Films
Polyelectrolyte Multilayers
Hydrothermal Synthesis
Titania Nanosheets
Layer Deposition
Assembled Films
Nanoparticles
Intercalation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Wed, 17 Oct 2007, 13:29:43 EST