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A Novel Solvothermal Synthesis of High-Surface-Area SnO2 Nanocrystals

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A novel solvothermal synthesis of high-surface-area SnO2 nanocrystals with different particle sizes was presented. The synthesis was carried out by a two-step urea-based solvothermal method using SnCl4ยท5H2O as the starting material and ethanol as the solvent in the presence of different concentrations of urea. The obtained SnO2 nanocrystals at different reaction temperatures were characterized by means of X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), thermo-gravimetry and differential thermal analysis (TG-DTA), and nitrogen BET measurements. The results revealed that by increasing the alkalinity of the precursor solution and decreasing the reaction temperatures, the crystallite sizes of the prepared SnO2 nanocrystals decreased from 6 nm to 3 nm, while the specific surface area of the prepared powders increased from 114 m2/g to 187 m2/g. The well-dispersed high-surface-area powders are favorable for gas-sensing applications at room temperature.
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Document Type: Research Article

Publication date: December 1, 2008

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