(1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials， College of Material Science and Engineering, Donghua University, Shanghai 201620, China) (2. Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Donghua University, Shanghai 201620, China) (3. Institute of Functional Materials, Donghua University, Shanghai 201620, China)
In recent years, the rapid development of wearable sensors and electronic devices for health and environmental monitoring has put forward new requirements for sustainable energy collection and supply technologies. Organic flexible thermoelectric(TE) materials and devices are capable of converting heat directly into electricity, and have attracted increasing attention due to their inherent advantages of flexibility, affordability and low toxicity. Electrostatic spinning technology is a common method to prepare nanofiber membrane, which has the advantages of simplicity, universality and easy control, and has a broad application prospect in the field of flexible electronic devices. Here, Tellurium(Te) nanowires / PEDOT∶PSS thermoelectric nanofiber thin films were prepared by electrospinning and insitu synthesis. When the content of tellurium source is 5wt%, the length of Te nanowires is the longest and the thermoelectric performance of nanofiber film is the best. The conductivity is 1.62 S·cm-1, the Seebeck coefficient is 22.43 μV·k-1, the thermal conductivity is only ~0.08 W·m-1·K-1, and the ZT value reaches 0.112×10-3. Finally, a flexible device consisting of 4 strips was successfully prepared using the as-prepared composite film，and can produce an output voltage of 3.54 mV at a 45 K temperature difference.