Molybdenum Oxide and Molybdenum Carbide Silica Nanocomposites
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- Category: Molybdenum knowledge
- Published on 01 August 2013
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Ultrasonic irradiation of a slurry of molybdenum hexacarbonyl, Mo(CO)6, and silica microspheres in decane for 3 h, under ambient air and argon, yields diphasic molybdenum oxide−silica and molybdenum carbide−silica (MCS) composites,
Characterization using powder X-ray diffraction and transmission electron microscopy, with selected area electron diffraction, shows the amorphous nature of the nanocomposites.
The phase evolution by long-term thermal reduction of MOS under H2 shows that the Mo2O5 undergoes stepwise reduction following the sequence, MoV → MoIV → Moo.
The TEM image of MOS and MCS shows that the sonochemical decomposition products of Mo(CO)6 attached on the silica carrier as clusters, as thin layers, or as nanoparticles depends upon the precursor composition.
UV−visible absorption studies on the sonochemically produced MOS demonstrate that the characteristic absorption of the MoV oxide system and the Mo ions are likely to possess two types of coordination symmetry .
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