Abstract
Se−Te alloy nanocrystals (NCs) were synthesized in aqueous micellar phase at 85 °C by using Na2SeO3/Na2TeO3 as Se/Te source in the presence of different amounts of hydrazine (i.e., 0.1−3.6 M) as reducing agent over the entire mole fraction range of Se (xSe) from xSe = 0 to 1. The shape, structure, and composition of alloy NCs were characterized by scanning electron microscopic (SEM), transmission electron microscopic (TEM), and energy dispersive X-ray spectroscopic (EDS) measurements. Despite many similar characteristic features of elemental Se and Te, a drastic change in the morphology of NCs was observed from xSe = 0 to 1. Amorphous water-soluble Se nanoparticles were obtained at xSe = 1 in the presence of excess of hydrazine, whereas long nanoribbons of several micrometers of Te were produced at xSe = 0. In the intermediate mole fractions, a smooth transition in the morphology from predominantly rhombohedral in the Se rich-region to long nanoribbons in the Te rich-region of the mixtures was observed. A...
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