Laser-induced graphene enabled 1D fiber electronics

Laser-induced graphene (LIG) is a newly-emergent processing strategy for assembling graphene-based structures and devices with low-cost, high-efficiency and high-customizability. However, with the limitation of positioning accuracy, the application of LIG for swift and continuous production of 1D graphene-fiber based electronics is still vacant. Considering the unique 1D geometry with prominent advantages for flexible and wearable devices, in this work, we adventurously proposed and investigated a vertically-oriented laser-sweeping strategy to continuously convert the similar to 16.5 mm diameter polyimide monofilament into freestanding graphene fibers. Based on process-structure-property relationship modulated precisely by varied combinations of lasing power and pulse resolution, the LIG enabled fiber electronics (LIGFE) could simultaneously exhibit small diameter (<20 mm), high strength (56.49 MPa), electrical conductivity (306.45 S/m), gauge sensitivity (5.43), joule-heated temperature (71.3 degrees C), and capacitive performance (0.26 mF/cm(2)). Taking advantage of computer-aided design and manufacture along with the variously excellent properties, we lastly demonstrated the LIGFE as multimodal sensors for liquid sensing, airflow & respiration monitoring, ultrasonic frequency capturing, as well as functional element embedded in polymer composites for varied types of structural health monitoring from manufacturing to failure stages. (C) 2020 Elsevier Ltd. All rights reserved.