Structural Characterization of Self-Assembled MnO2 Nanosheets from Birnessite Manganese Oxide Single Crystals
Structural Characterization of Self-Assembled MnO2 Nanosheets from Birnessite Manganese Oxide Single Crystals
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DOI：
10.1021/cm049025d
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发表时间：
2004-11
影响因子：
8.6
通讯作者：
Xiaojing Yang;Y. Makita;Zonghuai Liu;K. Sakane;K. Ooi
中科院分区：
文献类型：
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作者：
Xiaojing Yang;Y. Makita;Zonghuai Liu;K. Sakane;K. Ooi
本文报道了水钠锰矿型锰氧化物单晶的质子化、剥离和自组装的研究。质子化通过在60 °C下加热的（NH 4）2S 2 O 8水溶液中从钾锰氧化物单晶中提取K+离子、通过插入TMA+离子随后水洗剥离成纳米片以及MnO 2纳米片在稀NaCl溶液中自组装来进行。利用X射线衍射、扫描电子显微镜、透射电子显微镜、原子力显微镜、X射线光电子能谱、傅里叶变换红外、热重-差热分析和化学成分分析系统地研究了这些阶段样品的结构。采用基于最大熵方法的全谱拟合方法，对质子化单晶中的电子密度分布进行了可视化。结果表明，质子化后的单晶体可以剥离成MnO 2。
We report in this paper the studies on protonation, exfoliation, and self-assembly of birnessite-type manganese oxide single crystals. The protonation was carried out by extracting K+ ions from the potassium manganese oxide single crystals in a (NH4)2S2O8 aqueous solution heated at 60 °C, exfoliation to nanosheets by the intercalation of TMA+ ions followed by water-washing, and the self-assembly of MnO2 nanosheets in a dilute NaCl solution. The structures of the samples at these stages were systematically investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared, thermogravimetric analysis-differential thermal analysis, and chemical compositional analysis. Electron density distribution in the protonated single crystal was visualized by whole-pattern fitting based on the maximum entropy method. The results indicated that the protonated single crystals can be exfoliated to MnO2 u...