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Microstructures and Spectroscopic Properties of Cryptomelane-type Manganese Dioxide Nanofibers
Abstract
Cryptomelane-type manganese dioxide (K-MnO 2 ) nanofibers with typical diameters of 20−60 nm and lengths of 1−6 μm were prepared by reacting KMnO 4 with MnSO 4 under hydrothermal conditions. Rietveld refinement from synchrotron X-ray powder diffraction data showed that the K-MnO 2 nanofibers crystallize in a body-centered tetragonal structure (space group I 4/ m ) with unit cell parameters a = 9.8241(5) Å and c = 2.8523(1) Å and elongate along the <001> direction. The K-MnO 2 nanofibers had a mean chemical composition of K 0.11 (H 3 O) 0.05 MnO 2 . The optical band gap of the K-MnO 2 nanofibers was estimated to be 1.32 eV based on the UV−visible absorption. The K-MnO 2 nanofibers had four diagnostic infrared absorptions at 722, 593, 524, and 466 cm −l, which represents specific fingerprints of the vibrational features of MnO 2 materials containing (2 × 2) + (1 × 1) tunnel structures. The Raman scattering spectrum of the K-MnO 2 nanofibers had nine Raman bands with four main contributions at 183, 386, 574, and 634 cm −1 along with five weak ones at 286, 330, 470, 512, and 753 cm −1, which are attributed to the Mn−O lattice vibrations within the MnO 6 octahedral frameworks. These intrinsic vibrational features can be conveniently used for online and/or in situ analyses of the K-MnO 2 nanofibers during electrochemical and/or ion-exchange reactions.
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Metadata
- Authors
- Gao, T., Glerup, M., Krumeich, F., Nesper, R., Fjellvåg, H., & Norby, P.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-07-31
- Volume
- 112
- Issue
- 34
- Pages
- 13134-13140
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2024818134
- Cited by
- 473
- References
- 24
- FWCI
- 4.04
- Type
- journal article
- Language
- en
- Open access
- closed
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- Gao, T., Glerup, M., Krumeich, F., Nesper, R., Fjellvåg, H., & Norby, P. (2008). Microstructures and Spectroscopic Properties of Cryptomelane-type Manganese Dioxide Nanofibers. The Journal of Physical Chemistry C. https://doi.org/10.1021/jp804924f
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