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Effect of RuO2 in the Shape Selectivity of Submicron-Sized SnO2 Structures

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journal contribution
posted on 30.06.2005, 00:00 by Niranjan S. Ramgir, Imtiaz S. Mulla, Kunjukrishna P. Vijayamohanan
Several dissimilar types of tin oxide microstructures including bipyramids, cubes, and wires synthesized effectively by means of a simple approach were investigated using X-ray diffraction (XRD), thermogravimetry/differential thermometric analysis (TG-DTA), and X-ray photoelectron spectroscopy (XPS). A possible growth mechanism is proposed using the results of these studies. The texture coefficient values of all the structures, indexed to a tetragonal lattice, exhibit amazing variation in the preferred orientation with respect to their shapes. Although XPS data indicate that wires and cubes have a strong SnO2 type signal, bipyramids interestingly exhibit both SnO and SnO2 signals and a correlation of the binding energy helps in understanding the growth kinetics of such submicron structures. The results suggest that the bipyramids are formed because of the vapor−solid process (VS) while wires and cubes are formed by the vapor−liquid−solid (VLS) progression.