Waterproof, Breathable, and UV-Protective Nanofiber-Based Triboelectric Nanogenerator for Self-Powered Sensors
Na Sun, Xiaonan Zhang, Jia-Ze Li, Ya-Wei Cai, Zhan Wei, Ling Ding, Gui‐Gen Wang
Abstract
Nanofiber-based triboelectric nanogenerators (TENGs) have garnered increasing attention as the multifunctional power source in wearable electronics. However, most traditional wearable device-based TENGs are unable to simultaneously achieve excellent outputs and multifunctional properties. Here, we design a waterproof, breathable, UV-protective TENG based on a poly(vinylidene fluoride) (PVDF)/poly(dimethylsiloxane) (PDMS)/TiO 2 nanofiber film for effective harvesting mechanical energy by a simple and low-cost combined electrospinning/electrospray method. The introduction of PVDF can overcome the synthesis puzzle of PDMS nanofibers during the electrospinning process. With numerous three-dimensional micro-to-nano hierarchical pores of a nanofiber network, the constructed TENG can furnish large specific surface area and good breathability. The addition of TiO 2 nanoparticles (NPs) increases the dielectric constant and surface roughness of the PVDF/PDMS/TiO 2 nanofiber film as well as the corresponding output performance of the nanofiber-based TENG. The as-presented TENG has a maximum peak power density of 0.72 W/m 2 and excellent breathability (18.6 mm/s). Due to the UV radiation absorbed by the TiO 2 NPs, the UVA transmittance ( T UVA ) of the TENG with 4% TiO 2 NPs is decreased to only 8.2%. The constructed TENG can be integrated to monitor human physiological signals in a self-powered manner. The nanofiber-based TENG provides a version to render these suitable for the daily-used wearable or portable electronics shortly.