Screen-printed bismuth telluride nanostructured composites for flexible thermoelectric applications
Screen-printed bismuth telluride nanostructured composites for flexible thermoelectric applications
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DOI：
10.1088/2515-7655/ac572e
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发表时间：
2022-04-01
影响因子：
6.9
通讯作者：
Nandhakumar, I
中科院分区：
文献类型：
--
作者：
Amin, A.;Huang, R.;Nandhakumar, I
本文报道了一种简单的两步表面活性剂辅助回流合成碲化铋（Bi 2 Te 3）纳米线（NWs）的结果。合成的纳米线的直径范围为70至110 nm，长度在0.4和3 μ m之间变化，择优晶格取向为（0 - 1 - 5），由掠入射X-射线衍射测定。我们首次证明了N-甲基-2-吡咯烷酮/聚偏氟乙烯（PVDF）的溶剂/粘合剂浆料配方适用于丝网印刷的Bi 2 Te 3纳米线与柔性热电（TE）材料的制造的潜力。复合膜中PVDF的重量%在10%至20%之间变化，以确定最佳组合物，从而在保持最佳TE性能的同时实现最大的膜柔性。将膜丝网印刷到Kapton基底上并进行印刷后退火处理以改善TE性能。退火和丝网印刷的Bi 2 Te 3/PVDFNW复合材料在225 K时的最大Seebeck系数为-192 μ VK ~（-1），功率因数为34 μ Wm ~（-1）K ~（-2）。柔性丝网印刷复合膜是柔性的，并且发现即使在2000次弯曲循环之后也是完整的。
We herein report the results of a facile two-step surfactant assisted reflux synthesis of bismuth telluride (Bi2Te3) nanowires (NWs). The as-synthesised NWs had diameters ranging from 70 to 110 nm with a length varying between 0.4 and 3 mu m and a preferential lattice orientation of (0 1 5) as determined by grazing incidence x-ray diffraction. We demonstrate for the first time that a solvent/binder paste formulation of N-methyl-2-pyrrolidone/polyvinylidene fluoride (PVDF) is suitable for screen-printing the Bi2Te3 NWs with the potential for the fabrication of flexible thermoelectric (TE) materials. The wt% of PVDF in the composite films was varied from 10% to 20% to identify the optimal composition with a view to achieving maximum film flexibility whilst retaining the best TE performance. The films were screen-printed onto Kapton substrates and subjected to a post-printing annealing process to improve TE performance. The annealed and screen printed Bi2Te3/PVDF NW composites yielded a maximum Seebeck coefficient -192 mu V K-1 with a power factor of 34 mu W m(-1)K(-2) at 225 K. The flexible screen printed composite films were flexible and found to be intact even after 2000 bending cycles.