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Preparation and coating of molybdenum oxide on alumina submicrospheres by sonochemical method

Published online by Cambridge University Press:  31 January 2011

Z. Y. Zhong ,
Y. Mastai ,
R. A. Salkar ,
Y. Koltypin  and
A. Gedanken
Z. Y. Zhong
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900 Israel
Y. Mastai
Affiliation:
Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, 76100 Israel
R. A. Salkar
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900 Israel
Y. Koltypin
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900 Israel
A. Gedanken*
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900 Israel
*
a)Address all correspondence to this author.[email protected]
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Abstract

In this work, we coated molybdenum oxide on submicrospheres of amorphous alumina and crystalline alumina, using a sonochemical method. The sonication products were characterized by transmission electron microscopy, x-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, ultraviolet–visible, Raman, Fourier transform infrared spectroscopy, and surface area (Brunauer–Emmett–Teller) measurements. We found that on crystalline alumina, the blue oxide of molybdenum was formed, while on amorphous alumina, the presence of an isolated tetrahedrally coordinated Mo oxide species was confirmed. It seems that the amount and types of surface hydroxyl groups on the surface of alumina play an important role in both the oxidation of Mo and the relative content of Mo species in the sonication product. The surface area of the alumina-coated Mo oxide is about 11 times larger than that of the bare alumina. An explanation for this change is offered.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 393 - 401
Copyright
Copyright © Materials Research Society 2000

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