Effect of RuO2 in the shape selectivity of submicron-sized SnO2structures

2019-09-03 10:14:40

analysis ray oxide cubes bipyramids

责任者: Ramgir, Niranjan S.;Mulla, Imtiaz S.;Vijayamohanan, Kunjukrishna P. 单位: Physical and Materials Chemistry Division, National Chemical Laboratory, Pune - 411008, India 来源出处: Journal of Physical Chemistry B,2005,109(25):12297-12303 摘要: 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. © 2005 American Chemical Society. 关键词: Tin compounds;Ruthenium compounds;Microstructure;X ray diffraction analysis;Thermogravimetric analysis;X ray photoelectron spectroscopy;Textures;Binding energy;Radiation;Transmission electron microscopy;Nanotubes;Semiconductor materials;Tin oxide (SnO2);Ruthenium oxide (RuO2);Semiconducting oxides;Nanowires