Hydrothermal Synthesis of Nanostructural La_xBi_(2-x)Se_yTe_(3-y) Powders

摘要

Nanostructural monophase LaxBi 2-xSeyTe 3-y alloy was synthesized with a hydrothermal route using BiCl3, LaCl3, selenium and tellurium powders as the precursors, NaOH and disodium ethylenediaminetetraacetiate （EDTA） as the additives. The hydrothermally synthesized powders have a petal-like morphology self-structured by the parallel side-by-side arrangement of the nano-scales. It is found that an alkaline additive is necessary for the synthesis of a monophase Bi2Te3 based alloy. EDTA acts as a soft template for the lateral growth of the nano-scales and the self-constitution of the petal-like structure. It is found that the synthesis reaction can be however hindered by excessive EDTA.