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This article introduces an innovative smart yarn, the Braided Thermoelectric-Triboelectric Dual-Effect Yarn (BTTEY), featuring an intricate braided construction. This yarn boasts remarkable electrical output capabilities coupled with robust mechanical core properties, enabling its direct integration into the weaving process on flat knitting machines. Leveraging the unique properties of BTTEY, we have developed the Double-Threaded Weft-Lined Thermoelectric-Triboelectric Nanogenerator (DTWL-TTEG). DTWL-TTEG exhibits exceptional thermoelectric and friction-based electrical generation performance, coupled with excellent sensitivity, biocompatibility, and wearer comfort. • Smart yarns with dual thermoelectric- triboelectric effect (BTTEY) have been prepared by alternating doping technique and braiding reinforcement technique pair and this yarn can be directly used for flat knitting. • Based on BTTEY, a smart fabric (DTWL-TTEG) that can be used to monitor whether the vascular crisis of severed finger occurs has been prepared by structure design and knitting, at the same time with the Internet of Things (IoT) technology. • The DTWL-TTEG has excellent triboelectric properties as well, and is a hybrid thermoelectric- triboelectric generator. It can also be used to assess the degree of recovery of severed finger reimplantation, enabling the integrated use of monitoring to recovery. Microsurgical reimplantation is the most effective option for the treatment of broken fingers. However, there is a high probability of vascular crisis after reimplantation surgery, which may lead to reimplantation failure. Here, a braided thermoelectric-triboelectric yarn (BTTEY) was prepared based on the multi-walled carbon nanotube yarn (MWCNTY). Using a computerized flat knitting machine, the yarn can be directly woven into a double-threaded weft-lined thermoelectric-triboelectric generator (DTWL-TTEG). This structure endows the fabric with high thermo-electric and triboelectric outputs. The thermo-electric power density can reach up to 89 μW·m −2 at a temperature difference of 30 K. The fabric has excellent softness, breathability, and good biocompatibility and can respond to temperature changes in a very short time with extreme sensitivity. In addition, based on the DTWL-TTEG, a smart alarm and postoperative recovery monitoring system has been developed, which can not only provide real-time monitoring of vascular crises with timely alarms, but also can be used to detect the postoperative recovery of the finger. This work provides a new direction for the combination of the thermoelectric effect and the triboelectric effect, and suggests great potential applications in healthcare and safety warning fields.
Dong et al. (Sat,) studied this question.