High-Yield Synthesis, Controllable Evolution, and Thermoelectric Properties of Te/Bi2Te3 Heterostructure Nanostrings

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• 作者：Zhiliang Li ; Shuqi Zheng ; Yuzhuo Zhang ; Hong Chen…
• 关键词：Te/Bi2Te3 nanostring ; nanowire ; nanosheet ; thermoelectric property ; solution phase method
• 刊名：Journal of Electronic Materials
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：44
• 期：6
• 页码：2061-2067
• 全文大小：1,979 KB
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• 作者单位：Zhiliang Li (1)
  Shuqi Zheng (1)
  Yuzhuo Zhang (1)
  Hong Chen (1)
  Ting Huang (1)
  Guiwu Lu (1)
  
  1. State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering, China University of Petroleum, Beijing, 102249, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X

文摘

Te/Bi₂Te₃ heterostructure nanostrings composed of multiple hexagon Bi₂Te₃ nanosheets, which were strung together by Te nanowires, were rationally designed and synthesized via an in situ growth process. High-yield heterostructure products were obtained via the two-step solution phase method. The rhombohedral Bi₂Te₃ nanosheets and hexagonal phase Te nanowires were characterized using x-ray diffractometer patterns and high-resolution transmission electron microscopy images. Detailed scanning electron microscopy and transmission electron microscopy images revealed that the lengths of the nanostrings were approximately 3.6?μm, and the diameters of the Bi₂Te₃ nanosheets were approximately 290?nm. The results indicated that the dimensions and morphologies of the Te/Bi₂Te₃ heterostructure nanostrings can be controlled by regulating the dosage of Bi(NO₃)₃·5H₂O from 0?mmol to 3?mmol, and the number of the Bi₂Te₃ nanosheets can be adjusted by controlling the concentration of N₂H₄·H₂O. Exceedingly low thermal conductivities from 0.45?W?m??K? to 0.49?W?m??K? were demonstrated by the measurements of the thermoelectric properties at near-room temperature from 350?K to 500?K. The phonon scattering mechanisms were systematically analyzed using three-dimensional schematic structure models.