Bi_2Te_3片式阵列的制备及生成机理

Preparation and the Growth Mechanism of Bi_2Te_3 with Sheet-Array Structure

以Bi(NO_3)_3和Te为反应物,在乙二胺四乙酸二钠(EDTA-2Na)、N,N-二甲基甲酰胺(DMF)与乙醇组成的混合溶剂以及过量强碱KOH的作用下,通过溶剂热反应,制得Bi_2Te_3热电材料的片式阵列纳米结构。利用XRD、SEM、EDX对产物的物相、形貌及成分进行了表征和研究。通过实验研究推断这种Bi_2Te_3片式阵列的形成过程可能是一个络合—成核—生长—脱离—组装的过程。

Bi2Te3 nanomaterials with sheet-array structure were synthesized using solvothermal method in the presence of ethylenediaminetetraacetis acid disodium salt （EDTA）, ethanol and N, N-dimethylformamide（DMF）. The products were characterized by X-ray diffraction and scanning electron microscopy. The Bi2Te3 sheet-arrays in this solvothermal process were formed mainly by the following route as a coordination-nucleation-growth-disengagement-assembly process to result in such a novel nanostructure.