Amplified Performance of Charge Accumulation and Trapping Induced by Enhancing the Dielectric Constant via the Cyano Group of 3D‐Structured Textile for a Triboelectric Multi‐Modal Sensor

Abstract

To further improve the output performance of triboelectric devices, reducing charge attenuation and loss has become a hot research topic. Particularly, textiles have emerged as one of the promising research directions for triboelectric devices owing to their special internal structure and large specific surface area. In the present work, polyacrylonitrile fibers are fabricated with two distinct structures to provide a higher dielectric constant due to the strong polar properties brought about by higher dipole moment of the CN group. In addition, the complex and closely connected structure of the textile increases specific internal surface area. As a friction layer, the output voltage is shown to increase to 625% of the initial value (from 8 to 60 V) after the application of friction for a short time due to accumulation property. When acting as a trapping layer, the charge loss after injection is effectively prevented due to excellent charge trapping effect. After 24 h, the triboelectric output performance remains at ≈70% of the initial value (decreasing from 320 to 220 V), which is more than 20 times that of the polytetrafluoroethylene film, which decreases from 125 to 19 V. The device is realized for the advanced application of multi‐modal sensors.

Output Performance Enhanced Triboelectric Nanogenerators Induced by Magnetic Ink Trapping Property Act as Wearable Sensors

“…Owing to the properties of the magnetic polymer elastomer itself, it compressed to a certain extent under pressure; thus, the contact area increased when certain magnetic particles are added. However, if the magnetic particle droplets are over the certain amount, the air will fill the space between the friction layer and the electrode on the back, reducing the overall dielectric constant and capacitance level, also, because of the thickness of the droplets themselves, when the number of droplets increases, leading to an overall thicker structure, eq shows that the surface charge density gradually decreases Figure c shows a photograph of the TENG structure.…”

“…However, if the magnetic particle droplets are over the certain amount, the air will fill the space between the friction layer and the electrode on the back, reducing the overall dielectric constant and capacitance level, also, because of the thickness of the droplets themselves, when the number of droplets increases, leading to an overall thicker structure, eq 1 shows that the surface charge density gradually decreases. 22 Figure 1 c shows a photograph of the TENG structure. The left side shows PTFE coated with magnetic droplets, and the right side shows a nylon film coated with magnetic droplets.…”

Emerging Trends of Nanofibrous Piezoelectric and Triboelectric Applications: Mechanisms, Electroactive Materials, and Designed Architectures

“…[157] In ambient conditions, PAN typically adopts two common configurations: the planar zigzag structure, also known as the "sawtooth" form, and the 3 1spiral configuration. [158] PAN has various advantages for use in nanofiber-based PTEGs. First, because of its high melting temperature of 322 °C, it has high heat resistance and can maintain its structure and performance under high-temperature working conditions.…”