Ultraelastic Yarns from Curcumin‐Assisted ELD toward Wearable Human–Machine Interface Textiles

Abstract

Intelligent human-machine interfaces (HMIs) integrated wearable electronics are essential to promote the Internet of Things (IoT). Herein, a curcumin-assisted electroless deposition technology is developed for the first time to achieve stretchable strain sensing yarns (SSSYs) with high conductivity (0.2 Ω cm −1) and ultralight weight (1.5 mg cm −1). The isotropically deposited structural yarns can bear high uniaxial elongation (>>1100%) and still retain low resistivity after 5000 continuous stretching-releasing cycles under 50% strain. Apart from the high flexibility enabled by helical loaded structure, a precise strain sensing function can be facilitated under external forces with metal-coated conductive layers. Based on the mechanics analysis, the strain sensing responses are scaled with the dependences on structural variables and show good agreements with the experimental results. The application of interfacial enhanced yarns as wearable logic HMIs to remotely control the robotic hand and manipulate the color switching of light on the basis of gesture recognition is demonstrated. It is hoped that the SSSYs strategy can shed an extra light in future HMIs development and incoming IoT and artificial intelligence technologies.

Significant Reduction of Interfacial Thermal Resistance and Phonon Scattering in Graphene/Polyimide Thermally Conductive Composite Films for Thermal Management

“…However, the intrinsic low thermal conductivity coefficient (λ) of PI cannot meet the current requirements for efficient and fast heat dissipation of flexible displays, folding screens, and flexible wearable devices, etc. [10,11].…”

Flexible Strain Sensors for Wearable Hand Gesture Recognition: From Devices to Systems

“…Forming a helical structure of conductor material is commonly used to fabricate stretchable conductive fibers, which are able to sustain very large strain while using less elastic conductor material. [ 78–84 ] It is relatively easier to be fabricated compared with the wrinkle structure, as no prestretching is needed. Zhu et al developed a strain sensor by twining the metal‐wrapped nylon yarns on the PU core fiber to form the helical structure ( Figure a).…”

“…Zhu et al developed a strain sensor by twining the metal‐wrapped nylon yarns on the PU core fiber to form the helical structure ( Figure a). [ 78 ] When the sensor is stretched, detachment of the adjacent metal‐deposited nylon yarns occurs, leading to an increase in resistance (Figure 8b). The sensor exhibited large stretchability of more than 300% (Figure 8c) and excellent reliability after 5000 stretching−releasing cycles at 50% strain (Figure 8d).…”

Biosignal-Based Human–Machine Interfaces for Assistance and Rehabilitation: A Survey

“…A further paper by Dong et al [197] proposed a smart glove embedded with piezoresistive strain sensors based on stretchable polydimethylsiloxanecarbon black to recognize finger gestures and control robot fingers. Zhu et al [198] presented a different smart glove based on stretchable conductive metal-coated yarns (a nylon yarn covered by a metal film) to remotely control a robotic hand and manipulate the colour switching of light by using gesture recognition. Hang et al [199] detected various human body motions using a poly(acrylamide) hydrogel-based strain sensor.…”