Enhanced thermoelectric performance of CdO : Ag nanocomposites.
Enhanced thermoelectric performance of CdO : Ag nanocomposites.
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DOI：
10.1039/c6dt02348g
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发表时间：
2016-07
影响因子：
4
通讯作者：
Linjie Gao;Shufang Wang;Ran Liu;Xinyu Zha;Niefeng Sun;Shujie Wang;Jianglong Wang;G. Fu
中科院分区：
文献类型：
--
作者：
Linjie Gao;Shufang Wang;Ran Liu;Xinyu Zha;Niefeng Sun;Shujie Wang;Jianglong Wang;G. Fu
采用固相反应法制备了金属Ag纳米颗粒嵌入多晶CdO基体中的CdO：Ag纳米复合材料。Ag的加入增加了CdO的晶界，形成了大量的CdO/Ag界面。通过将Ag掺入到CdO基质中，功率因数增加，这可能是由于增强的电子的能量依赖性散射引起的载流子能量过滤效应。此外，降低热导率也实现了较强的声子散射从晶界，氧化镉/银界面和银纳米粒子。这些伴随的影响导致增强的ZT值为所有的CdO：Ag纳米复合材料，表明引入金属Ag纳米粒子到CdO主机的策略是非常有效的，在优化热电性能。
CdO : Ag nanocomposites with metallic Ag nanoparticles embedded in the polycrystalline CdO matrix were synthesized by the solid-state reaction method. The addition of Ag led to increased grain boundaries of CdO and created numerous CdO/Ag interfaces. By incorporating Ag into the CdO matrix, the power factor was increased which was probably due to the carrier energy filtering effect induced by the enhanced energy-dependent scattering of electrons. In addition, reduced thermal conductivity was also achieved by stronger phonon scattering from grain boundaries, CdO/Ag interfaces and Ag nanoparticles. These concomitant effects resulted in enhanced ZT values for all CdO : Ag nanocomposites, demonstrating that the strategy of introducing metallic Ag nanoparticles into the CdO host was very effective in optimizing the thermoelectric performance.