碲化锑基低维材料的制备和物性研究
发布时间:2018-03-06 10:27
本文选题:碲化锑 切入点:水热法 出处:《新疆大学》2017年硕士论文 论文类型:学位论文
【摘要】:本文采用的是简单的水热法,在碱性的环境下以SbCl3粉末作为Sb源、Na2TeO3粉末作为Te源,NaBH4做为还原剂,没有其他粘合剂参与的条件下,通过控制各组分比例以及碱性浓度从而控制体系的生长速率。对所得样品进行了扫描电子显微镜(SEM)、X射线衍射(XRD)、透射电子显微镜(HRTEM)、选取电子衍射(SAED)和高温差式扫描量热仪(DSC)等测试,测试结果表明成功的制备了三方晶系碲化锑纳米带结构,此结构下的熔点为420℃,相较于块状碲化锑低的多(650℃)。由于纳米带状结构具有较低的熔点和纳米化的结构,因此这种结构对于提高热电性能方面有着很大的帮助。本实验使用高真空热蒸发镀膜法制备了结晶性良好的单晶碲化锑薄膜,分别在不同衬底上制备了连续的碲化锑薄膜。通过对比及观察,研究了不同衬底对样品生长的影响,发现层状结构的氟晶云母更适合平整薄膜的生长。对所得样品进行了SEM、XRD、HRTEM、SAED和AFM等测试,观察到了样品的六方片堆叠成柱状生长,从而形成连续薄膜,薄膜表面光滑无杂质和颗粒。本实验为碲化锑的薄膜的生长提供了新的方法。
[Abstract]:In this paper, a simple hydrothermal method with SbCl3 powder as SB source Na _ 2TeO _ 3 powder as reducing agent and no other binder being used as reducing agent in alkaline environment is used. The growth rate of the system was controlled by controlling the proportion of components and the alkaline concentration. The samples were scanned by scanning electron microscope (SEM), transmission electron microscope (TEM), electron diffraction (SAEDE) and high temperature differential scanning. Calorimeter, DSC-and other tests, The results show that the cubic antimony telluride nanocrystalline structure has been successfully prepared. The melting point of the nanocrystalline antimony telluride nanostrip is 420 鈩,
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