用Zn(NO3)2·6H2O对作原料、Na2CO3作沉淀剂,制得了纳米ZnO粉体.用TG-DSC、XRD和TEM分别对前驱体和纳米ZnO粉体进行了表征.结果表明:所得前驱体在253℃左右分解为六方纤锌矿型纳米ZnO,颗粒大小约为15～20nm,粒径分布窄,基本无团聚,粉体的比表面积为64.12m2·g-1实验发现,当反应物浓度从2.0mol·L-1减小至1.0、0.5mol·L-1时,纳米ZnO粉体的粒径基本无变化,但颗粒间的团聚状态减轻;在用无水乙醇洗涤沉淀前,先用蒸馏水或稀氨水清洗对得到的纳米ZnO粉体的团聚状态没有明显的区别.
ZnO nanoparticles were synthesized by a precipitation method with Zn(NO3)2·6H2O as the starting material
and Na2CO3 as the precipitant. When the concentration of the reactants reduced from 2.0 to 0.5mol·L-1, the particle size hardly changed but the agglomeration was weaker. TG-DSC curves of the precursor show that
the precursor decomposes at about 253℃. XRD pattern of the powder indicates that the hexagonal wurtzite ZnO nanocrystals can be obtained when
the precursor calcinated at 300℃ for 2h. TEM micrographs show that the ZnO nanoparticles are well dispersed and the average particle size
is 15～20nm. The specific surface area of the obtained powder is 64.12m2·g-1. There is no obvious difference whether to wash the precipitate by distilled water or ammonia
before to wash by ethanol.
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