Shape-controlled synthesis of manganese oxide octahedral molecular sieve three-dimensional nanostructures

Jikang Yuan; Wei-Na Li; Sinue Gomez; Steven L Suib

doi:10.1021/ja053463j

Shape-controlled synthesis of manganese oxide octahedral molecular sieve three-dimensional nanostructures

J Am Chem Soc. 2005 Oct 19;127(41):14184-5. doi: 10.1021/ja053463j.

Authors

Jikang Yuan¹, Wei-Na Li, Sinue Gomez, Steven L Suib

Affiliation

¹ Department of Chemistry, Institute of Materials Science, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, CT 06269-3060, USA.

PMID: 16218603
DOI: 10.1021/ja053463j

Abstract

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.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Manganese Compounds / chemical synthesis*
Manganese Compounds / chemistry
Nanostructures / chemistry*
Oxides / chemical synthesis*
Oxides / chemistry
Particle Size
Surface Properties

Substances

Manganese Compounds
Oxides
manganese oxide