engleski

XRD and spectroscopic study of nanocrystalline SnO2

Tin dioxide, SnO2 and SnO2-based ceramics found various applications as gas sensors, catalysts, electrode materials. The properties of these oxides, such as particle size and morphology, structural and physical properties and crystallinity, greatly depend on the route of their synthesis. In present work very fine SnO2 powders were produced by a) slow and forced hydrolysis of aqueous SnCl4 solutions and b) hydrolysis of tin(IV)-isopropoxide dissolved in isopropanol (sol-gel route). Thus produced samples were characterized by X-ray powder diffraction (XRD, Fourier transform infrared (FTIR) and laser Raman spectroscopies. The XRD patterns showed presence of the cassiterite structure. As found from XRD line broadening the crystallite sizes of all powders were in nanosized range. The method of low frequency Raman scattering was applied for SnO2 particle sized determination. On the basis of these measurements it was concluded that the size of SnO2 particles was also in the nanometer range and that the sol-gel particles heated to 4000C consisted of several SnO2 crystallites.

nije evidentirano

nije evidentirano