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Room-Temperature Welding of Silver Telluride Nanowires for High-Performance Thermoelectric Film
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-10-07 , DOI: 10.1021/acsami.9b14854
Xiangliang Zeng 1, 2 , Linlin Ren 1 , Jinqi Xie 1, 3 , Dasha Mao 1, 3 , Mingmei Wang 1, 2 , Xiaoliang Zeng 1 , Guoping Du 2 , Rong Sun 1 , Jian-Bin Xu 4 , Ching-Ping Wong 5
Affiliation  

Flexible thermoelectric materials that can harvest waste heat energy have attracted great attention because of the rapid progress of flexible electronics. Ag2Te nanowires (Ag2Te NWs) are considered as promising thermoelectric materials to fabricate flexible thermoelectric film and device because of their high Seebeck coefficient, but poor contact between the Ag2Te NWs results in low electrical conductivity. Generally, hot or cold pressing can increase the electrical conductivity between the Ag2Te NWs. However, these process tend to destroy the initial morphology of the Ag2Te NWs and/or cause only physical contact between the Ag2Te NWs. Herein, we report an approach to the room-temperature welding of Ag2Te NWs to enhance their contacts by facile combination of vacuum filtration and drop-coating methods. The obtained Ag2Te NWs film exhibits excellent Seebeck coefficient of −99.48 μV/K and high electrical conductivity of 15 335.05 S/m at room temperature, which gives the power factor of 151.76 μW m–1 K–2. Surprisingly, an optimal Seebeck coefficient of −154.96 μV/K and electrical conductivity of 14 982.42 S/m can be obtained at 420 K, giving a power factor of 359.76 μW m–1 K–2. Moreover, the electrical resistance of the Ag2Te NWs film was only 1.3 times of the initial electrical resistance after 1000 bending cycles, indicating good flexibility of the film. A finger-touch test is conducted by using the Ag2Te NWs film as thermoelectric power generator, which achieves a stable output voltage of about 0.52 mV, suggesting its great potential applications in self-powered flexible electronic devices.

中文翻译:

高性能热电薄膜碲化银纳米线的室温焊接

由于柔性电子器件的快速发展,可以收集废热能的柔性热电材料引起了极大的关注。Ag 2 Te纳米线(Ag 2 Te NWs)由于其高塞贝克系数而被认为是制造柔性热电薄膜和器件的有前途的热电材料,但是Ag 2 Te NWs之间的接触不良会导致低电导率。通常,热压或冷压可增加Ag 2 Te NW之间的电导率。然而,这些过程倾向于破坏Ag 2 Te NWs的初始形态和/或仅引起Ag 2之间的物理接触。Te NWs。在本文中,我们报告了一种Ag 2 Te NW的室温焊接方法,通过真空过滤和滴涂方法的简便组合来增强它们的接触。所得的Ag 2 Te NWs薄膜在室温下表现出极好的塞贝克系数,为-99.48μV/ K,高电导率为15 335.05 S / m,功率因数为151.76μWm –1 K –2。出人意料的是,在420 K时可获得的最佳塞贝克系数为-154.96μV/ K,电导率为14 982.42 S / m,功率因数为359.76μWm –1 K –2。此外,Ag 2的电阻NWs膜在1000次弯曲循环后仅为初始电阻的1.3倍,表明该膜具有良好的柔韧性。通过使用Ag 2 Te NWs薄膜作为热电发生器进行手指触摸测试,该薄膜可实现约0.52 mV的稳定输出电压,表明其在自供电柔性电子设备中的巨大潜力。
更新日期:2019-10-07
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