The SnO2 nanocrystaline powders were synthesized by citric acid dissolution-pyrolysis method. The medium products were analyzed by FTIR. The products were characterized by TG-DTA, XRD, TEM, SEM etc.The results showed that the Sn was coordinated with aconitase acid during the dissolution. The SnO2 particles prepared by this method were with a mean size of 5～10 nm. The calcined products presented lacunose micro-arc structure, thus favoring the application as gas-sensitive materials.
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