Investigation on the thermoelectric properties of beta -Zn4Sb3 graphene composites
Received date: 2018-02-02
Online published: 2020-03-22
将不同比例的石墨烯粉末和beta-Zn4Sb3 粉末混合, 通过热压法制备出复合材料样品, 并对其结构和热电性质进行检测.X 射线衍射结果表明,样品的主要成分仍然是 beta -Zn4Sb3 相, 晶粒尺寸随石墨烯浓度的增加略有减小.这说明石墨烯浓度在 5.0% 以内时对样品的物相形成没有明显影响.另外, 复合石墨烯后样品的 Seebeck 系数变化不大,但电导率降低、热导率略有增大, 从而使热电优值有所降低,主要是由于石墨烯的掺入在样品中引入了电子补偿效应,使原来受主能级上的空穴减少, 进而降低了样品中的载流子浓度,同时也改变了 beta -Zn4Sb3 中 Zn 原子无序结构.
关键词： beta -Zn4Sb3; 石墨烯; 热电复合材料
刘风采, 高鹏飞, 孟庆飞, 秦娟, 史伟民, 王林军 . 石墨烯复合 beta-Zn4Sb3材料的热电性质[J]. 上海大学学报(自然科学版), 2020 , 26(1) : 95 -101 . DOI: 10.12066/j.issn.1007-2861.2011
beta-Zn4Sb3/graphene composite material was prepared by mixing graphene powder and beta -Zn4Sb3 powder through hot pressing, and its structure and thermoelectric properties were checked. The results of X-ray diffraction show that the main component of the composite samples is still beta -Zn4Sb3 phase,and that the average grain size decreases slightly with the increase of graphene concentration, indicating that there is no significant effect on the phase formation of the composite sample when the graphene concentration is within 5.0%. In addition, the Seebeck coefficient of the composites containing graphene varies only slightly, but the electrical conductivity decreases and the thermal conductivity increases, which contributes to the lowering of the ZT value. The main reason might be the reduction of hole concentration due to the electron compensation effect accompanied by the incorporation of graphene, thereby reducing the sample carrier concentration, and the changes to the Zn atom disorder of beta -Zn4Sb3 as well.
Key words： beta -Zn4Sb3; graphene; thermoelectric composite material
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