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yexuqing木虫之王 (文学泰斗)
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纳米粘合剂助力丝网印刷柔性热电材料
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Nanobinders advance screen-printed flexible thermoelectrics 纳米粘合剂助力丝网印刷柔性热电材料 ▲ 作者：WENYI CHEN, XIAO-LEI SHI, MENG LI, TING LIU, YUANQING MAO, QINGYI LIU, ET AL. ▲ 链接：https://www.science.org/doi/10.1126/science.ads5868 ▲摘要：柔性度有限、制造工艺复杂、高成本和性能不足是限制柔性无机热电材料（用于可穿戴电子产品和其他高端冷却应用）的可扩展性和商业化的主要因素。 研究组开发了一种创新且具有成本效益的技术，其集成了溶剂热、丝网印刷和烧结技术来制备无机柔性热电薄膜。该可印刷薄膜以Bi2Te3基纳米板作为高度取向晶粒，以纳米棒作为“纳米粘合剂”，具有优异的可印刷薄膜热电性能、良好的柔韧性、可大规模制造性和低成本。 研究组构建了由可印刷的n型Bi2Te3基薄膜和p型Bi0.4Sb1.6Te3薄膜组装而成的柔性热电器件，其归一化功率密度超过3 μW cm-2 K-2，在丝网印刷器件中表现优异。此外，该技术可扩展至其他无机热电薄膜体系，如Ag2Se，显示出广泛的适用性。 ▲ Abstract：Limited flexibility, complex manufacturing processes, high costs, and insufficient performance are major factors restricting the scalability and commercialization of flexible inorganic thermoelectrics for wearable electronics and other high-end cooling applications. We developed an innovative, cost-effective technology that integrates solvothermal, screen-printing, and sintering techniques to produce an inorganic flexible thermoelectric film. Our printable film, comprising Bi2Te3-based nanoplates as highly orientated grains and Te nanorods as “nanobinders,” shows excellent thermoelectric performance for printable films, good flexibility, large-scale manufacturability, and low cost. We constructed a flexible thermoelectric device assembled by printable n-type Bi2Te3-based and p-type Bi0.4Sb1.6Te3 films, which achieved a normalized power density of >3 μW cm-2 K-2, ranking among the highest in screen-printed devices. Moreover, this technology can be extended to other inorganic thermoelectric film systems, such as Ag2Se, showing broad applicability. |
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