期刊
NANOMATERIALS
卷 7, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/nano7100295
关键词
MnO2; Co-Mn oxide; nanosheets; optical absorption; X-ray absorption spectroscopy; local structure
类别
资金
- Nanotechnology Platform program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Photon Factory Program Advisory Committee [PF-PAC 2014G614]
- MEXT Project for the Creation of Research Platforms and Sharing of Advanced Research Infrastructure
- Grants-in-Aid for Scientific Research [16H02392] Funding Source: KAKEN
Co-Mn oxide nanosheets with the chemical composition H0.23Co0.23Mn0.77O2 (C23M77NS) and MnO2 nanosheets (M100NS) were prepared by exfoliation of layer-structured oxides via chemical processing in an aqueous medium. The optical properties of C23M77NS and M100NS were compared using UV-Vis spectroscopy, and the valence states of Mn and Co and local structures around them were examined using X-ray absorption spectroscopy. M100NS with an average Mn valence of 3.6 exhibits large structural distortion, whereas C23M77NS with an average Mn valence of 4.0 does not exhibit structural distortion. Spontaneous oxidization of Mn occurs during ion-exchange and/or exfoliation into nanosheets. These results have originated the hypothesis that structural distortion determines the valence state of Mn in compounds with CdI2-type-structured MnO2 layers.
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