Shape-Controlled Synthesis of Manganese Oxide Octahedral Molecular Sieve Three-Dimensional Nanostructures
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- 作者：Jikang Yuan ; Wei-Na Li ; Sinue Gomez ; and Steven L. Suib
- 刊名：Journal of the American Chemical Society
- 出版年：2005
- 出版时间：October 19, 2005
- 年：2005
- 卷：127
- 期：41
- 页码：14184 - 14185
- 全文大小：261K
- 年卷期：v.127,no.41(October 19, 2005)
- ISSN：1520-5126
文摘
Cryptomelane-type manganese oxide octahedral molecular (OMS) sieve three-dimensional (3D) nanostructures were synthesized via facile temple-free low-temperature hydrothermal reactions. Morphologies of the cryptomelane-type OMS-2 nanoparticles with tunnel dimension of 4.6 × 4.6 Å can be tuned by varying reaction temperatures. At low temperature (120 
C), OMS-2 dendritic nanoclusters composed of uniform single-crystal nanotetragonal prisms with square cross-sections were formed. At high temperature (180 C), the morphologies of OMS-2 became spherical dandelion-like microspheres composed of uniform single-crystal OMS-2 nanoneedles. Slow oxidation of Mn2+ by Cr2O7- under hydrothermal conditions is critical for the formation of the hierarchically ordered OMS-2 3D nanostructures.
C), OMS-2 dendritic nanoclusters composed of uniform single-crystal nanotetragonal prisms with square cross-sections were formed. At high temperature (180 C), the morphologies of OMS-2 became spherical dandelion-like microspheres composed of uniform single-crystal OMS-2 nanoneedles. Slow oxidation of Mn2+ by Cr2O7- under hydrothermal conditions is critical for the formation of the hierarchically ordered OMS-2 3D nanostructures.