We report simple acrylamide polymerization process to prepare nanocrystalline tin dioxide(SnO2) particles. A small amount of the so-called premix solution(monofunctional acrylamide and difunctional N, N'-methylenebisacrylamide) was mixed with the aqueous solution of Sn4+ in certain proportion, and a few drops of ammonium persulfate solution were added as initiator. When homogenized by magnetic stirring and heated to about 70℃, the mixed solution became a gel. This hydrous gel was directly decomposed by thermal treatment, resulting in obtaining rutile crystalline SnO2 particles with a narrow size distribution typically in the range of 20 nm～40 nm.
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