摘要
采用多元醇法和熔融淬火高温退火法合成银纳米线(AgNWs)和填充方钴矿Yb_(0.3)Co_4Sb_(12)材料,采用超声分散法并结合等离子体快速烧结技术(SPS)烧结成AgNWs/Yb_(0.3)Co_4Sb_(12)纳米复合材料。通过XRD和扫描电镜分析材料的物相结构与微观形貌,测量计算了不同AgNWs复合含量样品的电导率、Seebeck系数、热导率、晶格热导率和ZT值。发现了复合AgNWs可以很大程度地提高方钴矿材料的电输运性能,但也使得其热导率不可避免地升高。最终AgNWs复合含量为0.5wt%的复合材料热电性能最佳,达到850 K时的1.02。
AgNWs and Yb filled skutterudites Yb03Co4Sb12were prepared by polyol reduction of silver nitrate and melting quenching annealing method.The nanocomposite AgNWs/Yb0.3Co4Sb12were obtained by combining ultrasound technology and spark plasma sintering with different AgNWs weight ratio.The microstructure of the samples were studied by XRD and FE-SEM images confirmed that AgNWs were well dispersed in Yb0.3Co4Sb12matrix.The thermoelectric properties of the samples with different AgNWs contents were investigated in detail.The results show that well-dispersed AgNWs in the bulk Yb0.3Co4Sb12can give rise to a much higher electrical conductivity and thermal conductivity without a noticeable decrease in Seebeck coefficient,which suggests the improvement of composites with AgNWs thermoelectrical was limited.The maximum ZT about1.02is observed with AgNWs contents of0.5wt%.
作者
周振兴
陆晓芳
陈鹏
顾士甲
王连军
ZHOU Zhen-xing;LU Xiao-fang;CHEN Peng;GU Shi-jia;WANG Ling-jun(College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai 201620, China)
出处
《人工晶体学报》
CSCD
北大核心
2017年第10期1879-1884,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(51374078)
