Zhao Yao, Nie Xiaolei, Sun Congli, Chen Yifan, Ke Shaoqiu, Li Cuncheng, Zhu Wanting, Sang Xiahan, Zhao Wenyu, Zhang Qingjie
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Nanostructure Research Center, Wuhan University of Technology, Wuhan 430070, China.
ACS Appl Mater Interfaces. 2021 Dec 15;13(49):58746-58753. doi: 10.1021/acsami.1c19143. Epub 2021 Dec 5.
Low-cost flexible thermoelectric (TE) films with excellent cooling performance are critical for the in-plane heat dissipation application based on the TE film refrigeration technology. In this work, a flexible film epoxy/BiSbTe is developed by the incorporation of ferromagnetic Co nanoparticles to improve the electrical transport and cooling performance. The magnetic properties and microstructures clearly indicate that part of Co nanoparticles in situ reacts with Te from BiSbTe to form CoTe, as well as Bi' antisite defects. The electric conductivity is greatly enhanced because of the increased carrier density, while a large Seebeck coefficient is well maintained because of the extra magnetic scattering. The power factor of the flexible film with 0.2 wt % Co nanoparticles reached 2.28 mW·m·K at 300 K, increased by 34% compared to the epoxy/BiSbTe film. The maximum cooling temperature difference is 1.5 times higher compared with the epoxy/BiSbTe film. This work provides a general method to improve the electrothermal conversion performance of BiSbTe-based flexible films through in situ reaction.
具有优异冷却性能的低成本柔性热电（TE）薄膜对于基于TE薄膜制冷技术的面内热耗散应用至关重要。在这项工作中，通过掺入铁磁Co纳米颗粒来开发柔性薄膜环氧树脂/铋锑碲，以改善其电输运和冷却性能。磁性和微观结构清楚地表明，部分Co纳米颗粒与铋锑碲中的Te原位反应形成CoTe以及Bi反位缺陷。由于载流子密度增加，电导率大大提高，而由于额外的磁散射，大的塞贝克系数得以很好地保持。含0.2 wt% Co纳米颗粒的柔性薄膜在300 K时的功率因子达到2.28 mW·m·K，与环氧树脂/铋锑碲薄膜相比提高了34%。最大冷却温差比环氧树脂/铋锑碲薄膜高1.5倍。这项工作提供了一种通过原位反应提高铋锑碲基柔性薄膜电热转换性能的通用方法。
