초음파 분무 열분해법에 의한 산화물 환원 공정의 구형 Bi2Te3 분말 합성
Spherical Bi2Te3 Powder Synthesized by Oxide-Reduction Process via Ultrasonic Spray Pyrolysis
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초록
Bismuth telluride (Bi2Te3) and its alloys are well-known thermoelectric materials for ambient temperature applications. In this study, the dissolved Bi-Te precursor solution was used to synthesis metallic Bi2Te3 powder via ultrasonic spray pyrolysis and reduction process. The droplets of the Bi-Te precursor solution were decomposed to Bi-Te oxide powders by ultrasonic spray pyrolysis. The spherical Bi2Te3 powders were synthesized by reduction reaction in atmosphere of hydrogen gas at the temperature above 375oC for 6h. The reduced Bi2Te3 powders have a mean particle size of 1.5 μm. The crystal structure of the powder was evaluated by X-Ray diffraction(XRD), and the microstructure with size and shape powders was observed by fieldemission scanning electron microscope(FE-SEM) and transmission electron microscope(TEM).
Abstract
Bismuth telluride (Bi2Te3) and its alloys are well-known thermoelectric materials for ambient temperature applications. In this study, the dissolved Bi-Te precursor solution was used to synthesis metallic Bi2Te3 powder via ultrasonic spray pyrolysis and reduction process. The droplets of the Bi-Te precursor solution were decomposed to Bi-Te oxide powders by ultrasonic spray pyrolysis. The spherical Bi2Te3 powders were synthesized by reduction reaction in atmosphere of hydrogen gas at the temperature above 375oC for 6h. The reduced Bi2Te3 powders have a mean particle size of 1.5 μm. The crystal structure of the powder was evaluated by X-Ray diffraction(XRD), and the microstructure with size and shape powders was observed by fieldemission scanning electron microscope(FE-SEM) and transmission electron microscope(TEM).
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