纳米晶SnO_2合成的溶胶-凝胶制备方法

Synthesis of Tin Oxide Nanocrystals by Sol-Gel Method

采用一种新的溶胶-凝胶法制备了氧化锡纳米晶。通过向硝酸锡溶液中加入酒石酸形成稳定的酒石酸锡的配合物,再向上述稳定的配合物溶液中滴加乙腈溶剂,配合物溶液出现了溶胶,再形成凝胶。对凝胶进行洗涤烘干后直接得到晶粒大小为4.5 nm的氧化锡纳米晶。200℃和400℃热处理得到的氧化锡纳米晶的晶粒大小分别为8.4 nm和13.7 nm。透射电子显微镜显示获得的纳米晶的分散性能很好。本方法对于无氯离子方法制备高纯度氧化物纳米晶具有推广意义。

SnO2 nanocrystals were synthesized by a novel sol - gel method. A very stable tin tartrate complex was obtained when tartaric acid was added to tin nitrate solution. The complex solution turned into sol and then into gel after acetonitrile was dropped into it. SnO2 nanocrystals with the size of about 4.5 nm were obtained after the gel was washed and vacuum - dried. SnO2 crystallites grew to 8.4nm and 13.7 nm when heated at 2009C and 400~C, respectively. TEM showed that the nanocrystals were well dispersed. This method can be widely applied to synthesize other nanocrystalline oxides with high purity free from chlorion.