Abstract In this work, an economical, surfactant-free and scalable solution synthesis method at room temperature for self-decorated copper selenide (Cu2-xSe) nanosheets is reported. Structural and morphological characterizations clearly revealed the formation of single cubic phase Cu2-xSe nanosheets in nearly stoichiometric ratio. The tentative mechanism for fabrication of self-decorated Cu2-xSe nanosheets was proposed. Furthermore, nanostructured bulk Cu2-xSe by hot pressing was explored for thermoelectric performance. High electrical conductivity (1.1 × 105 S/m), moderate Seebeck coefficient (87 μV/K) and low thermal conductivity (1.11 W/mK) at 753 K were obtained. The figure of merit (ZT) ~ 0.56 and power factor (PF) ~ 860 μW/mK2 at 753 K showed better performance than some reported Cu2-xSe nanostructured or bulk counterparts under same temperature. Also, theoretically device ZT ~0.16 and efficiency up to 3% could be achieved. The results indicate that this green and novel synthesis process is an alternative to other reported time or energy consuming processes.

中文翻译：

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室温合成自修饰硒化铜纳米片的结构、形态和热电性能

摘要 在这项工作中，报道了一种经济、无表面活性剂和可扩展的室温下自修饰硒化铜 (Cu2-xSe) 纳米片的溶液合成方法。结构和形态特征清楚地揭示了以接近化学计量比的单立方相 Cu2-xSe 纳米片的形成。提出了制备自装饰Cu2-xSe纳米片的初步机制。此外，通过热压探索了纳米结构体 Cu2-xSe 的热电性能。在 753 K 下获得了高电导率 (1.1 × 105 S/m)、中等塞贝克系数 (87 μV/K) 和低热导率 (1.11 W/mK)。品质因数 (ZT) ~ 0。56 和功率因数 (PF) ~ 860 μW/mK2 在 753 K 下表现出比相同温度下一些报道的 Cu2-xSe 纳米结构或块体对应物更好的性能。此外，理论上可以实现器件 ZT ~0.16 和高达 3% 的效率。结果表明，这种绿色和新颖的合成过程是其他报道的耗时或耗能过程的替代方法。