Copper-Coordinated Cellulose Fibers for Electric Devices with Motion Sensitivity and Flame Retardance

Abstract

Nanocomposite conductive fibers are of great significance in applications of wearable devices, smart textiles, and flexible electronics. Integration of conductive nanomaterials into flexible bio-based fibers with multifunctionality remains challenging due to interface failure, poor flexibility, and inflammability. Although having broader applications in textiles, regenerated cellulose fibers (RCFs) cannot meet the requirements of wearable electronics owing to their intrinsic insulation. In this study, we constructed conductive RCFs fabricated by coordinating copper ions with cellulose and reducing them into stable Cu nanoparticles coated on their surface. The Cu sheath offered excellent electrical conductivity (4.6 × 10 5 S m −1 ), electromagnetic interference shielding, and enhanced flame retardance. Inspired by plant tendrils, the conductive RCF was wrapped around an elastic rod to develop wearable sensors for human health and motion monitoring. The resultant fibers not only form stable conductive nanocomposites on the fiber surface by chemical bonds but also exhibit a huge potential for wearable devices, smart sensors, and flame-retardant circuits.

Versatile chewed gum composites with liquid metal for strain sensing, electromagnetic interference shielding and flexible electronics

“…With the burgeoning development of flexible electronics, integrated electronics that possess sensing capacity, electrical conductivity and smart electromagnetic interference-shielding ability 15–21 are attractive candidates for wearable electronics employed in personal healthcare, physical monitoring and energy generation. Liquid metals ( e.g.…”

“…With the burgeoning development of flexible electronics, integrated electronics that possess sensing capacity, electrical conductivity and smart electromagnetic interference-shielding ability [15][16][17][18][19][20][21] are attractive candidates for wearable electronics employed in personal healthcare, physical monitoring and energy generation. Liquid metals (e.g., EGaIn, Ga/In at 75 : 25 wt/wt) with good fluidity and high electrical and thermal conductivity, have been utilized in flexible electronics and sensors and as electromagnetic interference-shielding materials.…”

Multiscale Chiral Synthesis via Self-Assembly of Achiral Nanoparticles for Next-Generation Chiral Material-Based Applications: The Role of Metal Ions as Chirality Messengers

“…In addition, the low-magnification TEM image verifies the presence of chiral self-assembled Cu 2– x S MTs (Figure g), and the high-magnification TEM image also illustrates the formation of chiral self-assembled Cu 2– x S MTs by assembling the building block NPs (Figure h). Thus, the released Cu 2+ ions play a significant role in forming the coordination bridges with Cys molecules between Cu 2 S NPs, ,− giving rise to chiral bias during self-assembly. In other words, Cu 2 S NPs undergo surface oxidation under aerobic conditions, resulting in the phase transition from Cu 2 S to Cu 2– x S, accompanied by the release of Cu 2+ ions owing to the thermodynamically unstable Cu 2 S phase , and the low chemical potential of Cu 0 .…”

Self-Powered Sensors Made with Fabric-Based Electrodes and a Conductive Coating

“…17−20 However, textiles are inherently insulating and require conductive treatment to function as electrode substrates. 21,22 The primary approach for fabric-based electrodes involves coating the fabric surface with conductive or active materials to create functional electrodes. 23,24 Current research on fabric-based electrodes primarily focuses on material selection, structural design, and improving environmental adaptability.…”