Hydrothermal synthesis of Bi2Te3 nanowires through the solid-state interdiffusion of Bi and Te atoms on the surface of Te nanowires |
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Authors: | Jang-Jung Kim Sook-Hyun Kim Seung-Wook Suh Dong-Uk Choe Byung-Ki Park Jae-Rock Lee Young-Seak Lee |
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Institution: | 1. Center for Energy Materials Research, Korea Research Institute of Chemical Technology, 100 Jang-Dong, Yuseong-Gu, Daejeon 305-600, Republic of Korea;2. Industrial and Engineering Chemistry, Chung-Nam National University, Daejeon 305-764, Republic of Korea;3. Nanomaterials Science and Engineering, University of Science and Technology, Daejeon 305-333, Republic of Korea |
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Abstract: | Polycrystalline Bi2Te3 nanowires were prepared by a hydrothermal method that involved inducing the nucleation of Bi atoms reduced from BiCl3 on the surface of Te nanowires, which served as sacrificial templates. A Bi–Te alloy is formed by the interdiffusion of Bi and Te atoms at the boundary between the two metals. The Bi2Te3 nanowires synthesized in this study had a length of 3–5 μm, which is the same length as that of the Te nanowires, and a diameter of 300–500 nm, which is greater than that of the Te nanowires. The experimental results indicated that volume expansion of the Bi2Te3 nanowires was a result of the interdiffusion of Bi and Te atoms when Bi was alloyed on the surface of the Te nanowires. The morphologies of Bi2Te3 are strongly dependent on the reaction conditions such as the temperature and the type and concentration of the reducing agent. The morphologies, crystalline structure and physical properties of the product were analyzed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS). |
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Keywords: | A1 Diffusion A1 Nanostructures A2 Hydrothermal crystal growth B1 Alloys |
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