Abrasion Resistant/Waterproof Stretchable Triboelectric Yarns Based on Fermat Spirals

Abstract

Emerging energy harvesting yarns, via triboelectric effects, have wide application prospects in new‐generation wearable electronics. However, few studies have been carried out regarding simultaneously achieving high electrical performance, mechanical robustness, and comfortability in industrial‐scalable yarn. Here, an electronic yarn twisted into Fermat spiral, which has outstanding dynamic structure stability, is reported. The Fermat‐spiral‐based energy yarns (FSBEY) can simultaneously realize ultrahigh abrasion resistance (over 5000 Martindale standard abrasion cycles), stable reversible strain (100%), and excellent electrical output. Considerably high output (105 V, ≈1.2 µA under 2 Hz) can be attained upon contacting a single yarn (30 cm) with latex material, which is superior to most state‐of‐the‐art stretchable triboelectric yarns. The application of these FSBEY in wireless gesture recognition, smart screen information protection, and harvesting of energy from water dropletsis demonstrated. Moreover, textiles knitted from the FSBEY have distinguished waterproof nature and are breathable. This work shows a feasible proposal for building future “energy garments”.

Ultrasensitive Airflow Sensors Based on Suspended Carbon Nanotube Networks

“…Airflow sensors play key roles in aerospace, weather forecasting, environmental monitoring, mineral enterprise, biomedical engineering, electronic skins, wearable fabrics, integrated smart devices, and so on. [1][2][3] The working principles of traditional sensors are generally divided into piezoresistive, piezoelectric, capacitive, and triboelectric effects, [4][5][6][7][8] among which the piezoresistive effect is widely employed due to its simplicity. [8] However, traditional airflow sensors usually face problems, such as slow response speed, low sensitivity, large detection threshold, narrow detection range, poor hysteresis, and high power consumption, which seriously restrict their be attributed to the rigidity caused by the crosslinked short and multiwalled CNTs.…”

Challenges and emerging opportunities in transistor-based ultrathin electronics: design and fabrication for healthcare applications

“…In addition, a novel example of twisted electronic yarns has been reported. 133 Based on Fermat's spiral inspiration, excellent anti-abrasion properties and high output performance were simultaneously achieved. Twisted from a poly(vinylidene fluoride-trifluoroethylene) fiber mat, the triboelectric yarns have hydrophobic properties that could further protect the e-fiber from the penetration of water and laundry detergent (see Fig.…”

Textile-Based Mechanical Sensors: A Review

“…So far, a lot of work has been carried out on the developing and research of TMSs to improve the sensing performance of the devices, such as sensitivity, response range, response time, stability, etc., because these properties determine the practical application capabilities of the sensors [75]. Sensing performance can be improved by introducing special geometric structures, such as microarrays [76,77], microcracks [78], micropatterns [79,80], pleated structures [81,82], porous structures [83,84], spiral structures [85,86], etc. The innovation of materials is also a major key point to improve the sensing performance.…”