writer：Yusheng Wang, Xiaoliang Ma, Yinhong Zhuo, Yunfei Zhang*, Qiao Zhang, ChakYin Tang, ChiPong Tsui
keywords：Fe@MoO3, Carbon nanotubes, Internal electric field Thermoelectric properties, emperature monitoring
source：期刊
specific source：Chemical Engineering Journal
Issue time：2025年

The high Seebeck coefficient (S) of inorganic semiconductors is expected to compensate for the low S of single-walled carbon nanotubes (SWCNT) with high electrical conductivity (σ). In this work, nano-Fe modified MoO3 (Fe@MoO₃) has been synthesized by hydrothermal method. Then, high-S Fe@MoO₃ has been integrated with high-σ SWCNT for enhancing thermoelectric performance. The prepared Fe@MoO3/SWCNT exhibits an optimal power factor of 339.9 ± 16.7 μW m^-1 K^-2 with enhanced σ of 1125.7 ± 64.2 S cm^-1 and the S of 55.0 μV K^-1, which is approximately three times that of the original SWCNT. The performance improvement is attributed to the nano-Fe in Fe@MoO3, which tailors the internal electric field of MoO3 and compensates for electron capture from SWCNT through carrier mobility regulation, thereby effectively optimizing both σ and S. Furthermore, a thermoelectric module consisting of six pairs of p-type legs and copper wires is assembled, which demonstrates an optimal normalized power density of 2.42 μW cm^-2 K^-1. For application demonstration, a temperature alarm device is built based on the thermoelectric module, which can be set to trigger alarms at different temperatures from 0 °C to 200 °C with a sensitivity of ±1 °C. Therefore, this work provides new insights into the preparation of SWCNT composites with enhanced thermoelectric performance.