Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China.
School of Microelectronics and Physics, Hunan University of Technology and Business, Changsha 410205, People's Republic of China.
Nanotechnology. 2023 Feb 21;34(19). doi: 10.1088/1361-6528/acb94a.
Two-dimensional materials have potential applications for flexible thermoelectric materials because of their excellent mechanical and unique electronic transport properties. Here we present a functionalization method by a Lewis acid-base reaction to modulate atomic structure and electronic properties at surface of the MoSnanosheets. By AlClsolution doping, the lone pair electronics from S atoms would enter into the empty orbitals of Alions, which made the Fermi level of the 1T phase MoSmove towards valence band, achieving a 1.8-fold enhancement of the thermoelectric power factor. Meanwhile, benefiting from the chemical welding effect of Alions, the mechanical flexibility of the nanosheets restacking has been improved. We fabricate a wearable thermoelectric wristband based on this improved MoSnanosheets and achieved 5 mV voltage output when contacting with human body. We think this method makes most of the transition metal chalcogenides have great potential to harvest human body heat for supplying wearable electronic devices due to their similar molecular structure.
二维材料因其优异的机械性能和独特的电子输运性能，在柔性热电材料中有潜在的应用。在这里，我们提出了一种通过路易斯酸碱反应来调节 MoS 纳米片表面原子结构和电子特性的功能化方法。通过 AlCl3 溶液掺杂，来自 S 原子的孤对电子将进入 Al 离子的空轨道，使得 1T 相 MoS 的费米能级向价带移动，从而使热电功率因子提高了 1.8 倍。同时，得益于 Al 离子的化学焊接效应，纳米片的堆叠的机械柔韧性得到了提高。我们基于这种改进的 MoS 纳米片制备了一种可穿戴的热电腕带，当与人体接触时可产生 5 mV 的电压输出。我们认为，由于它们具有相似的分子结构，这种方法使得大多数过渡金属硫属化合物有很大的潜力从人体热量中获取能量，为可穿戴电子设备提供能源。
