Abstract One-dimensional telluride based materials have recently attracted significant attention for development of the high-efficiency thermoelectric materials. Among one dimensional nanostructures, nanotubular structure has shown significant enhancement in the energy conversion efficiency due to higher reduction in the therml conductivity as compared to other one dimensional nanostructrues. Though some progress has already been establsihed to prepare nanotubes still synthesis of ultra-thin, smoother surface and stoichiometry Bi2Te3 nanotubes are still big challenges. Herein, we have reported that properly adjusting concentration of the reducing agent, different types of one-dimensional Bi2Te3 nanostructures such as nanowires to hollow nanostructures can be synthesized by using a template assisted chemical process. Furthermore, ultra-thin, smoother surface and close to stoichiometry Bi2Te3 nanotubes with a diameter of about 50 nm have been obtained by properly adjusting concentration of the reducing agent. Our experimental results evidenced that concentration of the reducing agent (hydrazine hydrate) plays a crucial role (morphology controlling agent) for synthesis of different types one-dimensional nanostructures from nanowires to ultrathin smooth surface nanotubes. A possible formation mechanism has been proposed to explain formation of the different one-dimensional Bi2Te3 nanostructures and the specific role of the reducing agent based on the experimental results.

中文翻译：

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使用模板辅助化学过程还原剂对碲化铋纳米结构形成和形态的影响：从纳米线到超薄纳米管

摘要 近年来，一维碲化物基材料在开发高效热电材料方面引起了广泛关注。在一维纳米结构中，纳米管状结构与其他一维纳米结构相比，由于热导率降低更多，因此能量转换效率显着提高。尽管在制备纳米管方面已经取得了一些进展，但超薄、更光滑的表面和化学计量的 Bi2Te3 纳米管的合成仍然是巨大的挑战。在此，我们报道了适当调整还原剂的浓度，可以通过模板辅助化学过程合成不同类型的一维 Bi2Te3 纳米结构，例如纳米线到空心纳米结构。此外，超薄，通过适当调节还原剂的浓度，获得了直径约50nm的更光滑的表面和接近化学计量的Bi2Te3纳米管。我们的实验结果证明，还原剂（水合肼）的浓度对于从纳米线到超薄光滑表面纳米管的不同类型一维纳米结构的合成起着至关重要的作用（形态控制剂）。根据实验结果提出了一种可能的形成机制来解释不同一维 Bi2Te3 纳米结构的形成和还原剂的具体作用。我们的实验结果证明，还原剂（水合肼）的浓度对于从纳米线到超薄光滑表面纳米管的不同类型一维纳米结构的合成起着至关重要的作用（形态控制剂）。根据实验结果提出了一种可能的形成机制来解释不同一维 Bi2Te3 纳米结构的形成和还原剂的具体作用。我们的实验结果证明，还原剂（水合肼）的浓度对于从纳米线到超薄光滑表面纳米管的不同类型一维纳米结构的合成起着至关重要的作用（形态控制剂）。根据实验结果提出了一种可能的形成机制来解释不同一维 Bi2Te3 纳米结构的形成和还原剂的具体作用。