Shape-controlled synthesis of manganese oxide octahedral molecular sieve three-dimensional nanostructures.
Shape-controlled synthesis of manganese oxide octahedral molecular sieve three-dimensional nanostructures.
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DOI：
10.1021/ja053463j
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发表时间：
2005-09
影响因子：
15
通讯作者：
Jikang Yuan;Weinjie Li;Sinue Gomez;S. Suib
中科院分区：
文献类型：
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作者：
Jikang Yuan;Weinjie Li;Sinue Gomez;S. Suib
采用简单的低温水热反应合成了隐黑烷型氧化锰八面体分子筛三维纳米结构。隧道尺寸为4.6 x 4.6 A的隐黑烷型OMS-2纳米颗粒的形貌可以通过不同的反应温度来调节。在低温（120℃）下，形成了由均匀的方形截面纳米四边形单晶组成的OMS-2枝晶纳米团簇。在高温下（180℃），OMS-2的形貌变为由均匀单晶OMS-2纳米针组成的球状蒲公英状微球。Cr(2)O(7)（-）在水热条件下对Mn（2+）的缓慢氧化是形成层次化有序的OMS-2三维纳米结构的关键。
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 x 4.6 A can be tuned by varying reaction temperatures. At low temperature (120 degrees C), OMS-2 dendritic nanoclusters composed of uniform single-crystal nanotetragonal prisms with square cross-sections were formed. At high temperature (180 degrees C), the morphologies of OMS-2 became spherical dandelion-like microspheres composed of uniform single-crystal OMS-2 nanoneedles. Slow oxidation of Mn(2+) by Cr(2)O(7)(-) under hydrothermal conditions is critical for the formation of the hierarchically ordered OMS-2 3D nanostructures.