以V2O5和十六胺为原料在水热条件下合成了氧化钒纳米管, 采用XRD、SEM、TEM、FTIR、ESR等手段分析研究了氧化钒纳米管的形成机理. 结果表明, 氧化钒纳米管的形成主要基于“卷曲机理”, 其形成过程包括: 表面活性剂分子嵌入到钒氧化物层间, 形成新层状化合物前驱体; 水热驱动下层状化合物边缘松动, 并开始卷曲, 降低体系能量; 合适的水热反应时间下最终形成钒氧化物纳米管. 模板剂嵌入到钒氧化物层间形成一定大小的层间距以及V4+的存在对从层状化合物卷曲成纳米管起到了积极的作用.
Vanadium oxide nanotubes were prepared by hydrothermal self-assembling process from vanadium pentoxide
and organic molecules as structure-directing templates. The forming mechanism of vanadium oxide nanotubes was studied by XRD, SEM, TEM, FTIR, ESR. The
results show that the formation of the vanadium oxide nanotubes is based on the “rolling mechanism”, which can be divided into three main steps:
(1) The surfactant molecules intercalate into the interlayer of vanadium oxide, resulting in a new layered compound precursor. (2) These lamellar sheets
become loose at the edges and then start to rolle themselves. (3) Vanadium oxide nanotubes are finally formed. The results also confirm that the
certain interlayer distance resulting from the intercalation of template moleculae and the presence of vanadium (IV) play important roles in the
formation of curved interface during preparing vanadium oxide nanotubes.
参考文献
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