Respiration-mediated self-switched triboelectric nanogenerator for wearable point-of-care prevention and alarm of asthma

Advances in triboelectric nanogenerators for self‐powered wearable respiratory monitoring

“…Reproduced with permission. 14 Copyright 2022, Elsevier. (D) 3D render displaying interwoven fibers of the HFSS.…”

“…The self-switched TENG (SS-TENG) relies on a singleelectrode modality to automatically take emergency precautions upon detection of an asthmatic episode. 14 Made up of fixed, connection, and motion layers, the SS-TENG exhibits excellent flexibility and integrity for long-term point-of-care prevention (Figure 3A). When compressed by undulations in the thoracic cavity, the motion layer moves closer to the fixed layer, which are both linked by the connection layer.…”

Material selection and performance optimization strategies for a wearable friction nanogenerator (W-TENG)

“…However, PTFE has a stronger electronegativity (Table 1), and hence, it is widely used as a triboelectric material in the preparation of W-TENGs. [54][55][56][57][58] Yu et al, 59 designed a breath-controlled self-switching triboelectric nanogenerator (SS-TENG) and applied it for medical detection. Its appearance is similar to a at cylinder, which is divided into a xed layer, a connecting layer and a moving layer.…”

Core–Sheath Fiber-Based Triboelectric Nanogenerators for Energy Harvesting and Self-Powered Straight-Arm Sit-Up Sensing

“…Recently, F-TENGs have shown tremendous potential in two primary applications: energy harvesting and multifunctional self-powered sensors. − Compared to the traditional TENGs, F-TENGs are more appropriate as sensors in relation to human movements as they can withstand the complex mechanical deformations such as stretching, twisting, and bending, which can monitor human health and sport parameters in various activities. − These parameters will not only be beneficial in building the point-of-care health monitoring system remotely via wireless transmission but also assist the particular group (e.g., sporters) in gaining more accurate information for evaluating the exercise conditions. , On the other hand, F-TENGs, as energy-harvesting devices, have more advantages including high wearing, permeability, comfort, and low cost. The biomechanical energy from human bodies can be converted into this wearable electrical energy to supply power for electronic devices and to replace the external power sources.…”

“…Wearable electronics and wireless communication network gain the rapid development, which is making a difference in the lifestyle of people. − The stretchable and flexible energy devices that provide energy for the mobile wearable devices and wireless communication network are more significative, gaining widespread attention. − The traditional batteries with disadvantages of large size, inadequate safety, unsatisfactory flexibility, and frequent recharging have not met the requirements of wearable electronics. , Thus, it is highly necessary to develop a smart, integrated, and flexible power supply. Triboelectric nanogenerators (TENGs), based on the coupling of triboelectrification and electrostatic induction, can effectively scavenge the manifold high-entropy mechanical energy and generate electrical energy. − Furthermore, the one-dimensional fiber-based TENGs (F-TENGs) arise rapidly to break through the limitations of the traditional airtight film-based TENGs for the wearable applications. ,− The F-TENG possesses the characteristics of good breathability, comfort, and flexibility, which make it more suitable to wear. , Accompanied by human body motion, F-TENGs can successfully harvest biomechanical energy. These advantages make them an extremely attractive energy system in smart wearable electronics. , …”