Luo Yubo, Du Chengfeng, Liang Qinghua, Zheng Yun, Zhu Beibei, Hu Huanlong, Khor Khiam Aik, Xu Jianwei, Yan Qingyu, Kanatzidis Mercouri G
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Department of Chemistry, Northwestern University, Evanston, IL, 60208, USA.
Small. 2018 Dec;14(50):e1803092. doi: 10.1002/smll.201803092. Epub 2018 Oct 21.
This work reports the thermoelectric properties of the CuSbSe -x mol% PtTe (x = 0, 0.5, 1.0, 1.5, and 2.0) pellets composed of highly oriented single crystalline nanoplates. CuSbSe -PtTe single crystalline nanoplates are prepared by a wet-chemical process, and the pellets are prepared through a bottom-up self-assembly of the CuSbSe -PtTe nanoplates and spark plasma sintering (SPS) process. X-ray diffraction and field emission scanning electron microscopic analyses show a highly textured nature with an orientation factor of ≈0.8 for (00l) facets along the primary surface of the pellets (in-plane, perpendicular to the SPS pressure). By this way, bulk-single-crystal-like electrical and thermal transport properties with a strong anisotropy are obtained, which results in an effective optimization on thermoelectric performance. The maximum in-plane thermoelectric figure-of-merit ZT value reaches 0.50 at 673 K for CuSbSe -2.0 mol% PtTe pellet, which is about five times higher than the in-plane ZT (0.10) for pure CuSbSe .
本研究报道了由高度取向的单晶纳米片组成的CuSbSe -x mol% PtTe（x = 0、0.5、1.0、1.5和2.0）颗粒的热电性能。通过湿化学法制备了CuSbSe -PtTe单晶纳米片，并通过CuSbSe -PtTe纳米片的自下而上自组装和放电等离子烧结（SPS）工艺制备了颗粒。X射线衍射和场发射扫描电子显微镜分析表明，颗粒主表面（面内，垂直于SPS压力）上（00l）面的取向因子约为0.8，具有高度织构化的性质。通过这种方式，获得了具有强各向异性的块状单晶状电学和热输运性质，这导致了热电性能的有效优化。对于CuSbSe -2.0 mol% PtTe颗粒，在673 K时面内热电优值ZT的最大值达到0.50，这比纯CuSbSe的面内ZT（0.10）高约五倍。
