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Low temperature, shape-selective formation of Sb2Te3 nanomaterials and their thermoelectric applications

机译：SB2Te3纳米材料的低温，形状选择性形成及其热电应用

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摘要

Shape-selective Sb2Te3 nanomaterials have been synthesized utilizing a simple wet-chemical route at a low temperature within a short time. Dumb-bell like and chain-like Sb2Te3 nanomaterials are formed by the reaction of Te metal powder with SbCl3 salt in the presence of alkaline 2,7-DHN in CTAB micelle media at 80 ~C temperature. The size and shape of the nanomaterials can be easily tuned by changing the molar ratio of the surfactant to metal salts and controlling the other reaction parameters. The middle part of the dumb-bell like shapes is 15 ~ 1 nm, and the length 50 ~ 7 nm while the diameter of the chains is 125 ~ 7 nm. The opto-electronic properties, thermal stability and specific growth mechanism for the formation of different shapes are elaborated in detail. Both morphologies have been tested for thermoelectric applications. Among the two different morphologies, the chain-like morphology gives a better thermoelectric figure of merit (ZT) value compared to the dumb-bell like morphology at 300 K. The increase in ZT value of the chain-like morphology is due to reduction of the lattice thermal conductivity via the effective phonon scattering that is present at the interface between boundaries of the nanograins and in the rough surfaces of the nano-chains. The maximum ZT temperature moves significantly to the high temperature zone indicating that the shape-selective Sb2Te3 nanomaterials have potential application in power generation.
机译：形状选择性SB2Te3纳米材料已经在短时间内在低温下使用简单的湿化学途径合成。哑铃样和链状的Sb2te3纳米材料通过Te金属粉末在80〜C温度下在CTAB胶束介质中的碱性2,7-DHN存在下与SBCL3盐的反应形成。通过将表面活性剂与金属盐的摩尔比改变并控制其他反应参数，可以容易地调谐纳米材料的尺寸和形状。愚蠢的形状的中间部分为15〜1nm，长度为50〜7 nm，而链条的直径为125〜7 nm。详细阐述了用于形成不同形状的光电性质，热稳定性和特定生长机制。两种形态都已经过热电应用。在两种不同的形态中，链状形态与300k的形态相比给出了与形态的哑铃相比的更好的热电值（ZT）值。链状形态的ZT值的增加是由于减少通过有效的声子散射的晶格导热率存在于纳米纳尔的边界和纳米链的粗糙表面之间存在于界面处的界面。最大ZT温度显着移动到高温区，表明形状选择性Sb2te3纳米材料具有潜在的发电应用。

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  • 来源
    《RSC Advances》 |2015年第109期|共14页
  • 作者

    U. Nithiyanantham; Sivasankara Rao Ede; M. Fevzi Ozaydin;

  • 作者单位

    Electrochemical Materials Science (ECMS) Division CSIR-Central Electrochemical Research Institute (CECRI) Karaikudi-630006 Tamil Nadu India.;

    Electrochemical Materials Science (ECMS) Division CSIR-Central Electrochemical Research Institute (CECRI) Karaikudi-630006 Tamil Nadu India.;

    Materials Science and Mechanical Engineering Texas A&

    M University College Station TX 77843-3123 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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