水热合成Sb2Se3纳米线及其对Bi2Te3纳米粉末热电性能的影响  

Effects of Hydrothermaly Synthesized Sb_2Se_3 Nanowires on the Thermoelectric Properties of Bi_2Te_3 Nanopowders

作　　者：张艳华[1,2] 徐桂英[1] 郭志敏[2] 韩菲[1] 王泽[1] 葛昌纯[1] 

机构地区：[1]北京科技大学特种陶瓷与粉末冶金研究所,北京新能源材料重点实验室,北京100083 [2]装备指挥技术学院士官系,北京102249

出　　处：《无机材料学报》2010年第6期615-620,共6页Journal of Inorganic Materials

摘　　要：以SbCl3和Se粉为原料,水合肼(N2H4·H2O)为还原剂,采用水热法在150℃下,分别保温不同的时间合成Sb2Se3纳米粉末.通过X射线衍射(XRD)、场发射电子扫描电镜(FESEM)、透射电镜(TEM)以及高分辨透射电镜(HRTEM)等分析方法对产物的物相成分和微观形貌等进行了表征,实验结果表明保温时间达到24h时,获得产物为单相Sb2Se3纳米线晶体.根据实验结果还研究了水热合成Sb2Se3纳米线晶体可能的反应及生长机理,结果表明一维纳米线沿[001]方向生长,纳米线的形成与其独特的层状晶体结构有关.最后采用放电等离子体快速热压烧结法将水热合成的Bi2Te3纳米粉末与不同含量Sb2Se3纳米线进行复合,分析了Sb2Se3纳米线对Bi2Te3纳米材料热电性能的影响,发现复合约1at%Sb2Se3纳米线可以使Bi2Te3纳米材料热电性能有一定提高.Sb2Se3 nanowires were synthesized by a hydrothermal method at 150℃ for 3,6,12 and 24 h using SbCl3 and Se powder as the precursors,N2H4·H2O as reductant.X-ray diffraction（XRD）,transmission electron microscope（TEM）,field emission scanning electron microscope（FESEM） and high-resolution TEM（HRTEM） were applied to analyze the phase distributions,microstructures and grain sizes of the nanostructured Sb2Se3.It was found that the pure orthorhombic Sb2Se3 nanowires were formed at 150℃ for 24h by the hydrothermal synthesis method.The reaction mechanism and crystal growth mechanism of Sb2Se3 nanowires were investigated in the light of the experimental results.The Sb2Se3 nanowires grow along the [001] direction.The formation mechanism is mainly related to the special crystal structure of Sb2Se3.The TE properties of SPS nanocomposites of Bi2Te3 with different amount of Sb2Se3 nanowires were investigated.The addition of 1 at% Sb2Se3 nanowires can improve the electric properties of the Bi2Te3 nanopowders.

关 键 词：水热合成 Sb2Se3 纳米线 热电性能 

分 类 号：TQ134[化学工程—无机化工]