草酸钴纳米棒的一步固相化学合成及其表征

在非离子表面活性剂聚乙二醇(PEG)存在的条件下, 利用不同的钴盐分别与草酸进行低热固相化学反应, 一步合成了一系列金属配合物草酸钴纳米棒, 并采用XRD, TEM, SEM等分析手段对其结构和形貌进行了表征. 实验结果表明: 在合适的表面活性剂存在下, 利用钴盐与草酸的固相反应一步即可得到一维草酸钴纳米棒, 钴盐的不同及表面活性剂聚合度的不同均会影响纳米棒的形貌. 表面活性剂PEG在草酸钴纳米棒的形成过程中起到类似软模板的作用, 并诱导产物纳米晶沿某一方向定向生长从而生成纳米棒.

Synthesis and Characterization of Cobalt Oxalate Nanorods Prepared by One-step Solid-state Chemical Reaction

Metal complex cobalt oxalate nanorods were synthesized in one step by low-heating temperature solid-state chemical reactions of cobalt salts and oxalic acid in the presence of a nonionic surfactant, poly- ethylene glycol (PEG). The compositions and morphologies of samples were characterized by XRD, TEM and SEM. These results show that one-dimensional cobalt oxalate nanorods can be obtained in only one-step via the solid-state reactions of cobalt salts and oxalic acid with the assistance of a suitable surfactant. The morphologies of these nanorods were influenced by the different cobalt salts and surfactant with different degree of polymerization. The surfactant PEG plays a soft-template role in the process of rod-formation and induces the nanocrystallites of products to grow in definite direction. It is also expected that the present syn- thetic method can be extended to prepare other functional complex nanomaterials with desired morphologies by means of choosing suitable surfactant to modify the interface of solid-state chemical reaction.