摘要
纳米粒子因其独特的物理化学特性成为近年来材料科学领域的研究热点。制备方法是获得性能优越材料的关键。Co3O4具有正常的尖晶石结构，Co^2+占据八面体位置，在空气中低于800℃时十分稳定，是优良的催化剂材料^[1,2]，采用燃烧方法可通过控制反应条件在不发生沉淀的情况下获得化学组成均匀的复合氧化物粉体^[4-7]，本文利用聚合物燃烧方法探索制备粒径均匀，分散性好的立方Co3O4纳米粒子，选择聚乙烯醇（PVA）的原因是其分子内包含大量的羟基极性基团，能与金属离子尤其是过渡金属离子形成良好的化学键，促使金属离子在PVA高分子的网络中均匀螯合分布，有利于最终形成分散性良好的粉体。
Co 3O 4 nanoparticles were prepared by mixing polyvinylalcohol(PVA) and Co(NO 3) 2 in a mole ratio of 1∶3~4, at 100~130 ℃ to evaporate and remove water, and calcining at 400 ℃ for 2 h. The structure, crystal type and surface appearance were characterized by IR, XRD and TEM. The results showed that metal carbonate was formed using the polymer combustion methods, and the Co 3O 4 gave a cubic polygon appearance. Agglomerate free, well dispersive Co 3O 4 nanoparticles with the cubic structure and the average size of ca. 33 nm could be obtained from carbonated precursor by this simple and economical methods.
出处
《应用化学》
CAS
CSCD
北大核心
2001年第9期755-757,共3页
Chinese Journal of Applied Chemistry
基金
北京市科技新星基金资助项目 ( 95 5 810 34 0 0 )
