Gao Caiyan, Chen Guangming
Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering Shenzhen University, Shenzhen, 518060, P. R. China.
Small. 2018 Mar;14(12):e1703453. doi: 10.1002/smll.201703453. Epub 2018 Feb 9.
Although composites of organic polymers or n-type small molecule/carbon nanotube (CNT) have achieved significant advances in thermoelectric (TE) applications, p-type TE composites of small organic molecules as thick surface coating layers on the surfaces of inorganic nanoparticles still remain a great challenge. Taking advantage of in situ oxidation reaction of thieno[3,4-b]pyrazine (TP) into TP di-N-oxide (TPNO) on single-walled CNT (SWCNT) surface, a novel synthesis strategy is proposed to achieve flexible films of TE composites with narrow-bandgap (1.19 eV) small molecule coating on SWCNT surface. The TE performance can be effectively enhanced and conveniently tuned by poly(sodium-p-styrenesulfonate) content, TPNO/SWCNT mass ratio, and posttreatment by various polar solvents. The maximum of the composite power factor at room temperature is 29.4 ± 1.0 µW m K . The work presents a way to achieve flexible films of p-type small organic molecule/inorganic composites with clear surface coating morphology for TE application.
尽管有机聚合物或n型小分子/碳纳米管（CNT）复合材料在热电（TE）应用方面已取得显著进展，但作为无机纳米颗粒表面厚表面涂层的小分子p型TE复合材料仍然是一个巨大挑战。利用噻吩并[3,4-b]吡嗪（TP）在单壁碳纳米管（SWCNT）表面原位氧化成TP二-N-氧化物（TPNO）的反应，提出了一种新颖的合成策略，以实现具有窄带隙（1.19 eV）小分子涂层的SWCNT表面热电复合材料的柔性薄膜。通过聚（对苯乙烯磺酸钠）含量、TPNO/SWCNT质量比以及各种极性溶剂的后处理，可以有效地提高并方便地调节TE性能。室温下复合材料的最大功率因子为29.4±1.0 μW m K 。这项工作提出了一种方法，可实现具有清晰表面涂层形态的p型小分子/无机复合材料柔性薄膜用于TE应用。
