A kind of preparation method of octahedral snte nanocrystal with triangle as basic unit

Abstract

The invention discloses a method for preparing an octahedral SnTe nanocrystal with a triangle as a basic unit, which comprises the following steps: 1) After mixing Te powder and NaOH solution, add it to a reaction kettle so that the filling degree of the reaction kettle is 50- 80%; the Te powder is completely dissolved under the action of heat and pressure to obtain a mixed solution; 2) after cooling the mixed solution in the reactor obtained in step 1), add SnCl2 2H2O and NaBH to the reactor successively, and seal the reactor Carrying out heating reaction; 3) cooling the reacted solution to room temperature with the furnace, continuously washing the reaction product with distilled water until the washing liquid is neutral, and collecting the reaction product after vacuum drying. The invention prepares octahedral SnTe pure phase constructed by triangles. The preparation method of this process is simple, the SnTe pure phase is obtained, and the yield is 70-80%. At the same time, the process does not involve organic solvents, is pollution-free, and can effectively control the crystal surface construction state.

Description

technical field [0001] The invention specifically relates to a method for preparing octahedral SnTe nanocrystals with triangles as basic units. Background technique [0002] Tin telluride is a typical IV-VI narrow-band semiconductor material. It has distinctive thermodynamic and electronic properties. It is also a mirror-symmetric topological crystal insulator. Various physical properties of its surface states have been studied in the world. The experimental verification of the author. Tin telluride is widely used in the manufacture of spintronic devices, phase change memory materials, solar cells, thermoelectric converters and infrared devices. [0003] Topological insulators are different from well-known metals or insulators. They are materials with a topological insulating state. The electronic state in the body is a typical insulator with a non-zero band gap, but the surface presents a metallic state (there is a crossing energy gap at the Fermi surface. Dirac-type elec...

AI Technical Summary

Problems solved by technology

Due to the high surface free energy of the {111} crystal plane family, most of the nanowires, nanosheets, and nanocrystals formed in the existing literature reports are {110} and {100} crystal plane families exposed on the crystal surface, exposing the crystal plane It determines its morphology to be a polyhedron, and the basic geometric surface is mostly hexagonal or quadrilateral. It is difficult to prepare a regular polyhedron whose basic geometric surface is triangular, and the different crystal planes of the surface determine the difference in its topological properties.

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