| Summary: | 碩士 === 南台科技大學 === 奈米科技研究所 === 96 === Various Tin Oxide Nanocrytals were prepared via the thermal decomposition of tin (II) oleate in tri-n-octylamine and 1-Octadecanol at high temperature under different atmospheres. The coordinating solvent tri-n-octylamine and 1-Octadecanol also acts as a phase transformation controller reagent.The results revealed that the atmosphere is a important parameter for the fast formation of SnO nanoplanks. On the other hand, the phase transformation of the obtained better optical properties SnO2 nanoparticles can be well tuned by variation of the solvent of 1-Octadecanol used. The as-prepared nanoparticles are soluble in a nonpolar solvents , they also form transparent suspensions in an aqueous solution. The as-synthesized SnO2 nanoparticles are of the pure cassiterite structure. The band gaps of SnO2 nanoparticles are 5 eV, which are relatively large values because of the quantum size effect.The chemical composition, structure and morphology of the obtained nanocrystals were characterized by powder x-ray diffraction, scanning electron microscopy, High-resolution Field- transmission electron microscopy and Ultraviolet/Visible Spectrophotometer.
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