Ju Hyun, Park Dabin, Kim Jooheon
School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea.
Nanoscale. 2019 Apr 25;11(17):8502-8509. doi: 10.1039/c9nr01345h.
The chemical exfoliation of SnSe0.97Te0.03 nanosheets is performed via a solid-state reaction, ball-milling, lithium intercalation, and a hydrothermal exfoliation reaction from atomic materials, and the potential of flexible thermoelectric composite films for practical applications is demonstrated. The exfoliated SnSe0.97Te0.03 nanosheets are very thin, ∼300 nm in lateral size, and coated with nanosize poly(3,4-ethylenedioxythiophene) (PEDOT), which exhibits great affinity to the PEDOT:PSS matrix compared with the SnSe0.97Te0.03 nanosheets without PEDOT coating. The enhanced thermoelectric performance can be explained by the fact that the PEDOT nano-coating on the surface of the SnSe0.97Te0.03 nanosheets contributes to the excellent distribution of the SnSe0.97Te0.03 nanosheets in the composite system. The thermoelectric performance is also enhanced with the increase of the PEDOT-coated SnSe0.97Te0.03 nanosheets, and a PEDOT-coated SnSe0.97Te0.03 nanosheet/PEDOT:PSS composite with 20 wt% of PEDOT-coated SnSe0.97Te0.03 nanosheets exhibits a maximum figure of merit (ZT) of 0.18, which is ∼61% higher than that of the composite sample without the PEDOT coating process. The results provide a promising strategy for inorganic/organic composite-based efficient thermoelectrics.
通过固态反应、球磨、锂嵌入以及原子材料的水热剥离反应对SnSe0.97Te0.03纳米片进行化学剥离，并展示了柔性热电复合薄膜在实际应用中的潜力。剥离后的SnSe0.97Te0.03纳米片非常薄，横向尺寸约为300 nm，并涂覆有纳米尺寸的聚（3,4-乙撑二氧噻吩）（PEDOT），与未涂覆PEDOT的SnSe0.97Te0.03纳米片相比，其对PEDOT:PSS基体表现出极大的亲和力。热电性能的增强可以通过以下事实来解释：SnSe0.97Te0.03纳米片表面的PEDOT纳米涂层有助于SnSe0.97Te0.03纳米片在复合体系中实现优异的分布。随着涂覆PEDOT的SnSe0.97Te0.03纳米片数量的增加，热电性能也得到增强，含有20 wt%涂覆PEDOT的SnSe0.97Te0.03纳米片的PEDOT涂覆的SnSe0.97Te0.03纳米片/PEDOT:PSS复合材料表现出最大优值（ZT）为0.18，比未经过PEDOT涂覆工艺的复合样品高出约61%。这些结果为基于无机/有机复合材料的高效热电材料提供了一种有前景的策略。
