Thermal Stability and Anisotropic Sublimation of Two-Dimensional Colloidal Bi2Te3 and Bi2Se3 Nanocrystals
Joka Buha, Roberto Gaspari, Antonio Esau Del Rio Castillo, Francesco, Bonaccorso, and Liberato Manna
TL;DR
This study investigates the thermal stability and sublimation behavior of 2D Bi2Te3 and Bi2Se3 nanocrystals, revealing anisotropic sublimation patterns and compositional preferences during annealing.
Contribution
It provides new insights into the anisotropic sublimation mechanisms and stability of colloidal and exfoliated 2D Bi2Te3 and Bi2Se3 nanocrystals under high-temperature conditions.
Findings
Sublimation is anisotropic, favoring prismatic 011-0 planes.
Te and Se sublimation occurs preferentially.
Structural and compositional stability varies with temperature.
Abstract
The structural and compositional stabilities of two dimensional 2D Bi2Te3 and Bi2Se3 nanocrystals, produced by both colloidal synthesis and by liquid phase exfoliation, were studied by in situ transmission electron microscopy TEM during annealing at temperatures between 350 and 500 C. The sublimation process induced by annealing is structurally and chemically anisotropic and takes place through the preferential dismantling of the prismatic 011-0 type planes, and through the preferential sublimation of Te or Se.
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